IDT IDT72V253L6PF

3.3 VOLT HIGH-DENSITY SUPERSYNC II™
NARROW BUS FIFO
IDT72V223, IDT72V233
IDT72V243, IDT72V253
IDT72V263, IDT72V273
IDT72V283, IDT72V293
512 x 18/1,024 x 9, 1,024 x 18/2,048 x 9
2,048 x 18/4,096 x 9, 4,096 x 18/8,192 x 9
8,192 x 18/16,384 x 9, 16,384 x 18/32,768 x 9
32,768 x 18/65,536 x 9, 65,536 x 18/131,072 x 9
FEATURES:
•
•
•
•
•
•
•
•
Choose among the following memory organizations:
IDT72V223  512 x 18/1,024 x 9
IDT72V233  1,024 x 18/2,048 x 9
IDT72V243  2,048 x 18/4,096 x 9
IDT72V253  4,096 x 18/8,192 x 9
IDT72V263  8,192 x 18/16,384 x 9
IDT72V273  16,384 x 18/32,768 x 9
IDT72V283  32,768 x 18/65,536 x 9
IDT72V293  65,536 x 18/131,072 x 9
Functionally compatible with the IDT72V255LA/72V265LA and
IDT72V275/72V285 SuperSync FIFOs
Up to 166 MHz Operation of the Clocks
User selectable Asynchronous read and/or write ports (BGA Only)
User selectable input and output port bus-sizing
- x9 in to x9 out
- x9 in to x18 out
- x18 in to x9 out
- x18 in to x18 out
Pin to Pin compatible to the higher density of IDT72V2103/72V2113
Big-Endian/Little-Endian user selectable byte representation
5V tolerant inputs
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Fixed, low first word latency
Zero latency retransmit
Auto power down minimizes standby power consumption
Master Reset clears entire FIFO
Partial Reset clears data, but retains programmable settings
Empty, Full and Half-Full flags signal FIFO status
Programmable Almost-Empty and Almost-Full flags, each flag can
default to one of eight preselected offsets
Selectable synchronous/asynchronous timing modes for AlmostEmpty and Almost-Full flags
Program programmable flags by either serial or parallel means
Select IDT Standard timing (using EF and FF flags) or First Word
Fall Through timing (using OR and IR flags)
Output enable puts data outputs into high impedance state
Easily expandable in depth and width
JTAG port, provided for Boundary Scan function (BGA Only)
Independent Read and Write Clocks (permit reading and writing
simultaneously)
Available in a 80-pin Thin Quad Flat Pack (TQFP) or a 100-pin Ball
Grid Array (BGA) (with additional features)
High-performance submicron CMOS technology
Industrial temperature range (–40°°C to +85°°C) is available
FUNCTIONAL BLOCK DIAGRAM
*Available on the
BGA package only.
D0 -Dn (x9 or x18)
WEN
INPUT REGISTER
*ASYW
WRITE CONTROL
LOGIC
RAM ARRAY
512 x 18 or 1,024 x 9
1,024 x 18 or 2,048 x 9
2,048 x 18 or 4,096 x 9
4,096 x 18 or 8,192 x 9
8,192 x 18 or 16,384 x 9
16,384 x 18 or 32,768 x 9
32,768 x 18 or 65,536 x 9
65,536 x 18 or 131,072 x 9
WRITE POINTER
BE
IP
CONTROL
LOGIC
IW
OW
BUS
CONFIGURATION
MRS
PRS
RESET
LOGIC
*
*
**
*
TCK
TRST
TMS
TDI
TDO
LD SEN
*
WCLK/WR
JTAG CONTROL
(BOUNDARY SCAN)
OFFSET REGISTER
FF/IR
PAF
EF/OR
PAE
HF
FWFT/SI
PFM
FSEL0
FSEL1
FLAG
LOGIC
READ POINTER
OUTPUT REGISTER
READ
CONTROL
LOGIC
RT
RM
ASYR
*
*
RCLK/RD
REN
*
4666 drw01
OE
Q0 -Qn (x9 or x18)
IDT and the IDT logo are a registered trademarks of Integrated Device Technology, Inc. The SuperSync II FIFO is a trademark of Integrated Device Technology, Inc.
COMMERCIAL AND INDUSTRIAL TEMPERATURE RANGES
1
2003 Integrated Device Technology, Inc. All rights reserved. Product specifications subject to change without notice.
SEPTEMBER 2003
DSC-4666/12
IDT72V223/233/243/253/263/273/283/293 3.3V HIGH DENSITY SUPERSYNC IITM NARROW BUS FIFO
512 x 18, 1K x 9/18, 2K x 9/18, 4K x 9/18, 8K x 9/18, 16K x 9/18, 32K x 9/18, 64K x 9/18, 128K x 9
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
• The period required by the retransmit operation is now fixed and short.
• The first word data latency period, from the time the first word is written to an
empty FIFO to the time it can be read, is now fixed and short. (The variable
clock cycle counting delay associated with the latency period found on
previous SuperSync devices has been eliminated on this SuperSync family.)
• Asynchronous/Synchronous translation on the read or write ports
• High density offerings up to 1 Mbit
Bus-Matching SuperSync FIFOs are particularly appropriate for network,
video, telecommunications, data communications and other applications that
need to buffer large amounts of data and match busses of unequal sizes.
DESCRIPTION:
The IDT72V223/72V233/72V243/72V253/72V263/72V273/72V283/
72V293 are exceptionally deep, high speed, CMOS First-In-First-Out (FIFO)
memories with clocked read and write controls and a flexible Bus-Matching x9/
x18 data flow. These FIFOs offer numerous improvements over previous
SuperSync FIFOs, including the following:
• Flexible x9/x18 Bus-Matching on both read and write ports
• The limitation of the frequency of one clock input with respect to the other
has been removed. The Frequency Select pin (FS) has been removed,
thus it is no longer necessary to select which of the two clock inputs,
RCLK or WCLK, is running at the higher frequency.
WCLK
PRS
MRS
LD
FWFT/SI
FF/IR
PAF
OW
FSEL0
HF
FSEL1
BE
IP
VCC
PAE
PFM
EF/OR
RM
RCLK
REN
PIN CONFIGURATIONS
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
INDEX
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
RT
OE
VCC
Q17
Q16
GND
GND
Q15
Q14
VCC
Q13
Q12
GND
Q11
GND
Q10
VCC
Q9
Q8
Q7
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
WEN
SEN
DNC(1)
VCC
DNC(1)
IW
GND
D17
VCC
D16
D15
D14
D13
GND
D12
D11
D10
D9
D8
VCC
D7
D6
GND
D5
D4
D3
D2
D1
D0
GND
Q0
Q1
GND
Q2
Q3
VCC
Q4
Q5
GND
Q6
4666 drw02
NOTE:
1. DNC = Do Not Connect.
TQFP (PN80-1, order code: PF)
TOP VIEW
2
BUS FIFO
IDT72V223/233/243/253/263/273/283/293
3.3V
HIGH DENSITY
SUPERSYNC
IITM NARROW
IDT72V263/273/283/293/103/113
3.3V HIGH
DENSITY
SUPERSYNC
IITM NARROW
BUS FIFO
8K
9/18,2K
32K
x 9/18,
x 9/18,
9/18,x256K
9/18,
512K64K
x9 x 9/18, 128K x 9
512xx18,
18,16K
1K xx 9/18,
x 9/18,
4K64K
x 9/18,
8K 128K
x 9/18,x 16K
9/18, x32K
x 9/18,
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
During Asynchronous operation only the RD input is used to read data from the
FIFO. Data is read on a rising edge of RD, the REN input should be tied to its
active state, LOW. When Asynchronous operation is selected on the output port
the FIFO must be configured for Standard IDT mode, and the OE input used
to provide three-state control of the outputs, Qn.
The frequencies of both the RCLK and the WCLK signals may vary from 0
to fMAX with complete independence. There are no restrictions on the frequency
of the one clock input with respect to the other.
There are two possible timing modes of operation with these devices: IDT
Standard mode and First Word Fall Through (FWFT) mode.
In IDT Standard mode, the first word written to an empty FIFO will not appear
on the data output lines unless a specific read operation is performed. A read
operation, which consists of activating REN and enabling a rising RCLK edge,
will shift the word from internal memory to the data output lines.
In FWFT mode, the first word written to an empty FIFO is clocked directly
to the data output lines after three transitions of the RCLK signal. A REN does
DESCRIPTION (CONTINUED)
Each FIFO has a data input port (Dn) and a data output port (Qn), both of
which can assume either an 18-bit or a 9-bit width as determined by the state
of external control pins Input Width (IW) and Output Width (OW) during the Master
Reset cycle.
The input port can be selected as either a Synchronous (clocked) interface,
or Asynchronous interface. During Synchronous operation the input port is
controlled by a Write Clock (WCLK) input and a Write Enable (WEN) input. Data
present on the Dn data inputs is written into the FIFO on every rising edge of
WCLK when WEN is asserted. During Asynchronous operation only the WR
input is used to write data into the FIFO. Data is written on a rising edge of WR,
the WEN input should be tied to its active state, (LOW).
The output port can be selected as either a Synchronous (clocked) interface,
or Asynchronous interface. During Synchronous operation the output port is
controlled by a Read Clock (RCLK) input and Read Enable (REN) input. Data
is read from the FIFO on every rising edge of RCLK when REN is asserted.
PIN CONFIGURATIONS (CONTINUED)
A1 BALL PAD CORNER
A
WCLK
PRS
LD
PAF
FSEL0
BE
ASYR
PFM
RM
REN
WEN
MRS
FWFT/SI
OW
HF
FSEL1
IP
PAE
EF/OR
RCLK
ASYW
SEN
FF/IR
VCC
VCC
VCC
VCC
VCC
RT
OE
D17
IW
VCC
GND
GND
GND
GND
VCC
Q16
Q17
D16
D15
VCC
GND
GND
GND
GND
VCC
Q14
Q15
D13
D14
VCC
GND
GND
GND
GND
VCC
Q13
Q12
D11
D12
VCC
GND
GND
GND
GND
VCC
Q11
Q10
D8
D9
D10
VCC
VCC
VCC
VCC
Q1
Q9
Q8
D6
D7
D2
D0
TMS
TCK
TDO
Q2
Q4
Q7
D5
D4
D3
D1
TRST
TDI
Q0
Q3
Q5
Q6
3
4
5
6
7
8
9
B
C
D
E
F
G
H
J
K
1
2
10
4666 drw02b
BGA: 1mm pitch, 11mm x 11mm (BC100-1, order code: BC)
TOP VIEW
3
IDT72V223/233/243/253/263/273/283/293 3.3V HIGH DENSITY SUPERSYNC IITM NARROW BUS FIFO
512 x 18, 1K x 9/18, 2K x 9/18, 4K x 9/18, 8K x 9/18, 16K x 9/18, 32K x 9/18, 64K x 9/18, 128K x 9
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
For serial programming, SEN together with LD on each rising edge of WCLK,
are used to load the offset registers via the Serial Input (SI). For parallel
programming, WEN together with LD on each rising edge of WCLK, are used
to load the offset registers via Dn. REN together with LD on each rising edge
of RCLK can be used to read the offsets in parallel from Qn regardless of whether
serial or parallel offset loading has been selected.
During Master Reset (MRS) the following events occur: the read and
write pointers are set to the first location of the FIFO. The FWFT pin selects
IDT Standard mode or FWFT mode.
The Partial Reset (PRS) also sets the read and write pointers to the first
location of the memory. However, the timing mode, programmable flag
programming method, and default or programmed offset settings existing
before Partial Reset remain unchanged. The flags are updated according to the
timing mode and offsets in effect. PRS is useful for resetting a device in midoperation, when reprogramming programmable flags would be undesirable.
It is also possible to select the timing mode of the PAE (Programmable AlmostEmpty flag) and PAF (Programmable Almost-Full flag) outputs. The timing
modes can be set to be either asynchronous or synchronous for the PAE and
PAF flags.
If asynchronous PAE/PAF configuration is selected, the PAE is asserted
LOW on the LOW-to-HIGH transition of RCLK. PAE is reset to HIGH on the LOW-
DESCRIPTION (CONTINUED)
not have to be asserted for accessing the first word. However, subsequent
words written to the FIFO do require a LOW on REN for access. The state of
the FWFT/SI input during Master Reset determines the timing mode in use.
For applications requiring more data storage capacity than a single FIFO
can provide, the FWFT timing mode permits depth expansion by chaining FIFOs
in series (i.e. the data outputs of one FIFO are connected to the corresponding
data inputs of the next). No external logic is required.
These FIFOs have five flag pins, EF/OR (Empty Flag or Output Ready),
FF/IR (Full Flag or Input Ready), HF (Half-full Flag), PAE (Programmable
Almost-Empty flag) and PAF (Programmable Almost-Full flag). The EF and
FF functions are selected in IDT Standard mode. The IR and OR functions are
selected in FWFT mode. HF, PAE and PAF are always available for use,
irrespective of timing mode.
PAE and PAF can be programmed independently to switch at any point in
memory. Programmable offsets determine the flag switching threshold and can
be loaded by two methods: parallel or serial. Eight default offset settings are also
provided, so that PAE can be set to switch at a predefined number of locations
from the empty boundary and the PAF threshold can also be set at similar
predefined values from the full boundary. The default offset values are set during
Master Reset by the state of the FSEL0, FSEL1, and LD pins.
PARTIAL RESET (PRS)
MASTER RESET (MRS)
WRITE CLOCK (WCLK/WR*)
READ CLOCK (RCLK/RD*)
WRITE ENABLE (WEN)
READ ENABLE (REN)
IDT
72V223
72V233
72V243
72V253
72V263
72V273
72V283
72V293
LOAD (LD)
(x9 or x18) DATA IN (D0 - Dn)
SERIAL CLOCK (SCLK)
SERIAL ENABLE(SEN)
FIRST WORD FALL THROUGH/
SERIAL INPUT (FWFT/SI)
OUTPUT ENABLE (OE)
(x9 or x18) DATA OUT (Q0 - Qn)
RETRANSMIT (RT)
EMPTY FLAG/OUTPUT READY (EF/OR)
PROGRAMMABLE ALMOST-EMPTY (PAE)
HALF-FULL FLAG (HF)
BIG-ENDIAN/LITTLE-ENDIAN (BE)
INTERSPERSED/
NON-INTERSPERSED PARITY (IP)
FULL FLAG/INPUT READY (FF/IR)
PROGRAMMABLE ALMOST-FULL (PAF)
4666 drw03
OUTPUT WIDTH (OW)
BUSMATCHING
(BM)
INPUT WIDTH (IW)
Figure 1. Single Device Configuration Signal Flow Diagram
4
BUS FIFO
IDT72V223/233/243/253/263/273/283/293
3.3V
HIGH DENSITY
SUPERSYNC
IITM NARROW
IDT72V263/273/283/293/103/113
3.3V HIGH
DENSITY
SUPERSYNC
IITM NARROW
BUS FIFO
8K
9/18,2K
32K
x 9/18,
x 9/18,
9/18,x256K
9/18,
512K64K
x9 x 9/18, 128K x 9
512xx18,
18,16K
1K xx 9/18,
x 9/18,
4K64K
x 9/18,
8K 128K
x 9/18,x 16K
9/18, x32K
x 9/18,
to-HIGH transition of WCLK. Similarly, the PAF is asserted LOW on the LOWto-HIGH transition of WCLK and PAF is reset to HIGH on the LOW-to-HIGH
transition of RCLK.
If synchronous PAE/PAF configuration is selected , the PAE is asserted
and updated on the rising edge of RCLK only and not WCLK. Similarly, PAF
is asserted and updated on the rising edge of WCLK only and not RCLK. The
mode desired is configured during master reset by the state of the Programmable
Flag Mode (PFM) pin.
The Retransmit function allows data to be reread from the FIFO more
than once. A LOW on the RT input during a rising RCLK edge initiates a
retransmit operation by setting the read pointer to the first location of the memory
array. A zero-latency retransmit timing mode can be selected using the
Retransmit timing Mode pin (RM). During Master Reset, a LOW on RM will select
zero-latency retransmit. A HIGH on RM during Master Reset will select normal
latency.
If zero-latency retransmit operation is selected the first data word to be
retransmitted will be placed on the output register with respect to the same
RCLK edge that initiated the retransmit based on RT being LOW.
Refer to Figure 11 and 12 for Retransmit Timing with normal latency. Refer
to Figure 13 and 14 for Retransmit Timing with zero-latency.
A Big-Endian/Little-Endian data word format is provided. This function is
useful when data is written into the FIFO in long word format (x18) and read
out of the FIFO in small word (x9) format. If Big-Endian mode is selected, then
the most significant byte (word) of the long word written into the FIFO will be read
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
out of the FIFO first, followed by the least significant byte. If Little-Endian format
is selected, then the least significant byte of the long word written into the FIFO
will be read out first, followed by the most significant byte. The mode desired is
configured during master reset by the state of the Big-Endian (BE) pin.
The Interspersed/Non-Interspersed Parity (IP) bit function allows the user
to select the parity bit in the word loaded into the parallel port (D0-Dn) when
programming the flag offsets. If Interspersed Parity mode is selected, then the
FIFO will assume that the parity bit is located in bit position D8 during the parallel
programming of the flag offsets. If Non-Interspersed Parity mode is selected, then
D8 is assumed to be a valid bit and D16 and D17 are ignored. IP mode is selected
during Master Reset by the state of the IP input pin. This mode is relevant only
when the input width is set to x18 mode. Interspersed Parity control only has
an effect during parallel programming of the offset registers. It does not effect the
data written to and read from the FIFO.
A JTAG test port is provided, here the FIFO has fully functional Boundary
Scan feature, compliant with IEEE 1149.1 Standard Test Access Port and
Boundary Scan Architecture.
If, at any time, the FIFO is not actively performing an operation, the chip will
automatically power down. Once in the power down state, the standby supply
current consumption is minimized. Initiating any operation (by activating control
inputs) will immediately take the device out of the power down state.
The IDT72V223/72V233/72V243/72V253/72V263/72V273/72V283/
72V293 are fabricated using IDT’s high speed submicron CMOS technology.
TABLE 1 — BUS-MATCHING CONFIGURATION MODES
IW
OW
Write Port Width
Read Port Width
L
L
x18
x18
L
H
x18
x9
H
L
x9
x18
H
H
x9
x9
5
IDT72V223/233/243/253/263/273/283/293 3.3V HIGH DENSITY SUPERSYNC IITM NARROW BUS FIFO
512 x 18, 1K x 9/18, 2K x 9/18, 4K x 9/18, 8K x 9/18, 16K x 9/18, 32K x 9/18, 64K x 9/18, 128K x 9
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
PIN DESCRIPTION (TQFP & BGA PACKAGES)
Symbol
Name
(1)
*Big-Endian/
BE
Little-Endian
D0–D17 Data Inputs
I/O
Description
I During Master Reset, a LOW on BE will select Big-Endian operation. A HIGH on BE during Master Reset will
select Little-Endian format.
I Data inputs for a 18- or 9-bit bus. When in 18-bit mode, D0–D17 are used. When in 9-bit mode, D0–D8 are used
and the unused inputs, D9–D17, should be tied LOW.
EF/OR
O
FF/IR
Empty Flag/
Output Ready
Full Flag/
Input Ready
O
In the IDT Standard mode, the EF function is selected. EF indicates whether or not the FIFO memory is empty. In
FWFT mode, the OR function is selected. OR indicates whether or not there is valid data available at the outputs.
In the IDT Standard mode, the FF function is selected. FF indicates whether or not the FIFO memory is full. In the
FWFT mode, the IR function is selected. IR indicates whether or not there is space available for writing to the FIFO
memory.
During Master Reset, this input along with FSEL1 and the LD pin, will select the default offset values for the
programmable flags PAE and PAF. There are up to eight possible settings available.
FSEL0(1) Flag Select Bit 0
I
FSEL1(1) Flag Select Bit 1
I
During Master Reset, this input along with FSEL0 and the LD pin will select the default offset values for the
programmable flags PAE and PAF. There are up to eight possible settings available.
FWFT/SI First Word Fall
Through/Serial In
HF
Half-Full Flag
I
During Master Reset, selects First Word Fall Through or IDT Standard mode. After Master Reset, this pin functions
as a serial input for loading offset registers.
HF indicates whether the FIFO memory is more or less than half-full.
IP
(1)
O
Interspersed Parity
I
During Master Reset, a LOW on IP will select Non-Interspersed Parity mode. A HIGH will select Interspersed
Parity mode. Interspersed Parity control only has an effect during parallel programming of the offset registers. It
does not effect the data written to and read from the FIFO.
IW(1)
Input Width
I
LD
Load
I
MRS
Master Reset
I
OE
Output Enable
I
This pin selects the bus width of the write port. During Master Reset, when IW is LOW, the write port will be
configured with a x18 bus width. If IW is HIGH, the write port will be a x9 bus width.
This is a dual purpose pin. During Master Reset, the state of the LD input, along with FSEL0 and FSEL1, determines
one of eight default offset values for the PAE and PAF flags, along with the method by which these offset registers can
be programmed, parallel or serial (see Table 2). After Master Reset, this pin enables writing to and reading from the
offset registers.
MRS initializes the read and write pointers to zero and sets the output register to all zeroes. During Master Reset, the
FIFO is configured for either FWFT or IDT Standard mode, Bus-Matching configurations, one of eight programmable
flag default settings, serial or parallel programming of the offset settings, Big-Endian/Little-Endian format, zero latency
timing mode, interspersed parity, and synchronous versus asynchronous programmable flag timing modes.
OE controls the output impedance of Qn.
OW(1)
Output Width
I
PAE
Programmable
Almost-Empty Flag
Programmable
Almost-Full Flag
O
I
PRS
Programmable
Flag Mode
Partial Reset
I
Q0–Q17
Data Outputs
O
REN
RCLK/
RD
Read Enable
Read Clock/
Read Strobe
I
I
PAF
PFM(1)
O
This pin selects the bus width of the read port. During Master Reset, when OW is LOW, the read port willbe configured with a x18 bus width. If OW is HIGH, the read port will be a x9 bus width.
PAE goes LOW if the number of words in the FIFO memory is less than offset n, which is stored in the Empty Offset
register. PAE goes HIGH if the number of words in the FIFO memory is greater than or equal to offset n.
PAF goes HIGH if the number of free locations in the FIFO memory is more than offset m, which is stored in the
Full Offset register. PAF goes LOW if the number of free locations in the FIFO memory is less than or equal to m.
During Master Reset, a LOW on PFM will select Asynchronous Programmable flag timing mode. A HIGH on PFM
will select Synchronous Programmable flag timing mode.
PRS initializes the read and write pointers to zero and sets the output register to all zeroes. During Partial Reset,
the existing mode (IDT or FWFT), programming method (serial or parallel), and programmable flag settings are
all retained.
Data outputs for a 18- or 9-bit bus. When in 18-bit mode, Q0–Q17 are used and when in 9-bit mode, Q0–Q8 are
used, and the unused outputs, Q9-Q17 should not be connected. Outputs are not 5V tolerant regardless of the
state of OE.
REN enables RCLK for reading data from the FIFO memory and offset registers.
If Synchronous operation of the read port has been selected, when enabled by REN, the rising edge of RCLK
reads data from the FIFO memory and offsets from the programmable registers. If LD is LOW, the values loaded
into the offset registers is output on a rising edge of RCLK. If Asynchronous operation of the read port has been
selected, a rising edge on RD reads data from the FIFO in an Asynchronous manner. REN should be tied LOW.
Asynchronous operation of the RCLK/RD input is only available in the BGA package.
NOTE:
1. Inputs should not change state after Master Reset.
6
BUS FIFO
IDT72V223/233/243/253/263/273/283/293
3.3V
HIGH DENSITY
SUPERSYNC
IITM NARROW
IDT72V263/273/283/293/103/113
3.3V HIGH
DENSITY
SUPERSYNC
IITM NARROW
BUS FIFO
8K
9/18,2K
32K
x 9/18,
x 9/18,
9/18,x256K
9/18,
512K64K
x9 x 9/18, 128K x 9
512xx18,
18,16K
1K xx 9/18,
x 9/18,
4K64K
x 9/18,
8K 128K
x 9/18,x 16K
9/18, x32K
x 9/18,
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
PIN DESCRIPTION-CONTINUED (TQFP & BGA PACKAGES)
Symbol
RM(1)
RT
Name
Retransmit Timing
Mode
Retransmit
I/O
Description
I During Master Reset, a LOW on RM will select zero latency Retransmit timing Mode. A HIGH on RM will select
normal latency mode.
I RT asserted on the rising edge of RCLK initializes the READ pointer to zero, sets the EF flag to LOW (OR to HIGH
in FWFT mode) and does not disturb the write pointer, programming method, existing timing mode or programmable
flag settings. RT is useful to reread data from the first physical location of the FIFO.
SEN
WCLK/
WR
Serial Enable
Write Clock/
Write Strobe
I
I
SEN enables serial loading of programmable flag offsets.
If Synchronous operation of the write port has been selected, when enabled by WEN, the rising edge of WCLK
writes data into the FIFO. If Asynchronous operation of the write port has been selected, WR writes data into the
FIFO on a rising edge in an Asynchronous manner, (WEN should be tied to its active state). Asynchronous operation
of the WCLK/WR input is only available in the BGA package.
WEN
V CC
Write Enable
+3.3V Supply
I
I
WEN enables WCLK for writing data into the FIFO memory and offset registers.
These are VCC supply inputs and must be connected to the 3.3V supply rail.
NOTE:
1. Inputs should not change state after Master Reset.
PIN DESCRIPTION (BGA PACKAGE ONLY)
Symbol
ASYR(1)
Name
Asynchronous
Read Port
I/O
Description
I A HIGH on this input during Master Reset will select Synchronous read operation for the output port. A LOW
will select Asynchronous operation. If Asynchronous is selected the FIFO must operate in IDT Standard mode.
ASYW(1)
Asynchronous
Write Port
I
A HIGH on this input during Master Reset will select Synchronous write operation for the input port. A LOW
will select Asynchronous operation.
TCK(2)
JTAG Clock
I
Clock input for JTAG function. One of four terminals required by IEEE Standard 1149.1-1990. Test operations of the
device are synchronous to TCK. Data from TMS and TDI are sampled on the rising edge of TCK and outputs change
on the falling edge of TCK. If the JTAG function is not used this signal needs to be tied to GND.
TDI(2)
JTAG Test Data
Input
I
One of four terminals required by IEEE Standard 1149.1-1990. During the JTAG boundary scan operation, test data
serially loaded via the TDI on the rising edge of TCK to either the Instruction Register, ID Register and Bypass Register.
An internal pull-up resistor forces TDI HIGH if left unconnected.
TDO(2)
JTAG Test Data
Output
O
One of four terminals required by IEEE Standard 1149.1-1990. During the JTAG boundary scan operation, test data
serially loaded output via the TDO on the falling edge of TCK from either the Instruction Register, ID Register and Bypass
Register. This output is high impedance except when shifting, while in SHIFT-DR and SHIFT-IR controller states.
TMS(2)
JTAG Mode Select
I
TMS is a serial input pin. One of four terminals required by IEEE Standard 1149.1-1990. TMS directs the device through
its TAP controller states. An internal pull-up resistor forces TMS HIGH if left unconnected.
TRST(2)
JTAG Reset
I
TRST is an asynchronous reset pin for the JTAG controller. The JTAG TAP controller does not automatically reset
upon power-up, thus it must be reset by either this signal or by setting TMS= HIGH for five TCK cycles. If the TAP
controller is not properly reset then the FIFO outputs will always be in high-impedance. If the JTAG function is used
but the user does not want to use TRST, then TRST can be tied with MRS to ensure proper FIFO operation. If the
JTAG function is not used then this signal needs to be tied to GND.
NOTES:
1. Inputs should not change state after Master Reset.
2. These pins are for the JTAG port. Please refer to pages 41-44 and Figures 31-33.
7
IDT72V223/233/243/253/263/273/283/293 3.3V HIGH DENSITY SUPERSYNC IITM NARROW BUS FIFO
512 x 18, 1K x 9/18, 2K x 9/18, 4K x 9/18, 8K x 9/18, 16K x 9/18, 32K x 9/18, 64K x 9/18, 128K x 9
ABSOLUTE MAXIMUM RATINGS
Symbol
Com'l & Ind'l
Unit
Terminal Voltage
with respect to GND
–0.5 to +4.5
V
TSTG
Storage Temperature
–55 to +125
°C
IOUT
DC Output Current
–50 to +50
mA
VTERM(2)
Rating
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
RECOMMENDED DC OPERATING
CONDITIONS
Symbol
(1)
VCC
GND
VIH(2)
Min.
Typ.
Max.
Supply Voltage (Com'l & Ind'l)
3.15
3.3
3.45
V
Supply Voltage (Com'l & Ind'l)
0
0
0
V
Input High Voltage (Com'l & Ind'l)
2.0
—
5.5
V
Input Low Voltage (Com'l & Ind'l)
—
—
0.8
V
Operating Temperature Commercial
0
—
+70
°C
TA
Operating Temperature Industrial
-40
—
+85
°C
NOTES:
1. VCC=3.3V ± 0.15V, JEDEC JESD8-A compliant.
2. Outputs are not 5V tolerant.
3. 1.5V undershoots are allowed for 10ns once per cycle.
DC ELECTRICAL CHARACTERISTICS
(Commercial: VCC = 3.3V ± 0.15V, TA = 0°C to +70°C; Industrial: VCC = 3.3V ± 0.15V, TA = -40°C to +85°C; JEDEC JESD8-A compliant)
IDT72V223L
IDT72V233L
IDT72V243L
IDT72V253L
IDT72V263L
IDT72V273L
IDT72V283L
IDT72V293L
Commercial and Industrial(1)
tCLK = 6, 7.5, 10, 15 ns
Symbol
ILI(2)
ILO(3)
VOH
VOL
ICC1(4,5,6)
ICC1(4,5,6)
ICC2(4,7)
Parameter
Input Leakage Current
Output Leakage Current
Output Logic “1” Voltage, IOH = –2 mA
Output Logic “0” Voltage, IOL = 8 mA
Active Power Supply Current (x9 Input to x9 Output)
Active Power Supply Current (x18 Input to x18 Output)
Standby Current
Min.
Max.
Unit
–1
–10
2.4
—
—
—
—
1
10
—
0.4
30
35
15
µA
µA
V
V
mA
mA
mA
NOTES:
1. Industrial temperature range product for the 10ns speed grade is available as a standard device.
2. Measurements with 0.4 ≤ VIN ≤ VCC.
3. OE ≥ VIH, 0.4 ≤ VOUT ≤ VCC.
4. Tested with outputs open (IOUT = 0).
5. RCLK and WCLK toggle at 20 MHz and data inputs switch at 10 MHz.
6. For x 18 bus widths, typical ICC1 = 5 + fS + 0.002*CL*fS (in mA);
for x 9 bus widths, typical ICC1 = 5 + 0.775*fS + 0.002*CL*fS (in mA).
These equations are valid under the following conditions:
VCC = 3.3V, tA = 25°C, fS = WCLK frequency = RCLK frequency (in MHz, using TTL levels), data switching at fS/2, CL = capacitive load (in pF).
7. All Inputs = VCC - 0.2V or GND + 0.2V, except RCLK and WCLK, which toggle at 20 MHz.
CAPACITANCE (TA = +25°C, f = 1.0MHz)
Symbol
CIN(2)
COUT(1,2)
Parameter(1)
Input
Capacitance
Output
Capacitance
Conditions
VIN = 0V
Max.
10
Unit
pF
VOUT = 0V
10
pF
NOTES:
1. With output deselected, (OE ≥ VIH).
2. Characterized values, not currently tested.
8
Unit
TA
VIL
NOTE:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause
permanent damage to the device. This is a stress rating only and functional operation of
the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability.
2. VCC terminal only.
(3)
Parameter
BUS FIFO
IDT72V223/233/243/253/263/273/283/293
3.3V
HIGH DENSITY
SUPERSYNC
IITM NARROW
IDT72V263/273/283/293/103/113
3.3V HIGH
DENSITY
SUPERSYNC
IITM NARROW
BUS FIFO
8K
9/18,2K
32K
x 9/18,
x 9/18,
9/18,x256K
9/18,
512K64K
x9 x 9/18, 128K x 9
512xx18,
18,16K
1K xx 9/18,
x 9/18,
4K64K
x 9/18,
8K 128K
x 9/18,x 16K
9/18, x32K
x 9/18,
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
AC ELECTRICAL CHARACTERISTICS(1)
(Commercial: VCC = 3.3V ± 0.15V, TA = 0°C to +70°C; Industrial: VCC = 3.3V ± 0.15V, TA = -40°C to +85°C; JEDEC JESD8-A compliant)
Symbol
fS
tA
tCLK
tCLKH
tCLKL
tDS
tDH
tENS
tENH
tLDS
tLDH
tRS
tRSS
tRSR
tRSF
tRTS
tOLZ
tOE
tOHZ
tWFF
tREF
tPAFA
tPAFS
tPAEA
tPAES
tHF
tSKEW1
tSKEW2
Parameter
Clock Cycle Frequency
Data Access Time(5)
Clock Cycle Time
Clock High Time
Clock Low Time
Data Setup Time
Data Hold Time
Enable Setup Time
Enable Hold Time
Load Setup Time
Load Hold Time
Reset Pulse Width(3)
Reset Setup Time
Reset Recovery Time
Reset to Flag and Output Time
Retransmit Setup Time
Output Enable to Output in Low Z(4)
Output Enable to Output Valid(5)
Output Enable to Output in High Z(4,5)
Write Clock to FF or IR
Read Clock to EF or OR
Clock to Asynchronous Programmable Almost-Full Flag
Write Clock to Synchronous Programmable Almost-Full Flag
Clock to Asynchronous Programmable Almost-Empty Flag
Read Clock to Synchronous Programmable Almost-Empty Flag
Clock to HF
Skew time between RCLK and WCLK for EF/OR and FF/IR
Skew time between RCLK and WCLK for PAE and PAF
Commercial
BGA & TQFP
IDT72V223L6
IDT72V233L6
IDT72V243L6
IDT72V253L6
IDT72V263L6
IDT72V273L6
IDT72V283L6
IDT72V293L6
Min.
Max.
—
166
1
4
6
—
2.7
—
2.7
—
2
—
0.5
—
2
—
0.5
—
3
—
0.5
—
10
—
15
—
10
—
—
15
3
—
0
—
1
4
1
4
—
4
—
4
—
10
—
4
—
10
—
4
—
10
4
—
5
—
Commercial
BGA & TQFP
IDT72V223L7-5
IDT72V233L7-5
IDT72V243L7-5
IDT72V253L7-5
IDT72V263L7-5
IDT72V273L7-5
IDT72V283L7-5
IDT72V293L7-5
Min.
Max.
—
133.3
1(5)
5
7.5
—
3.5
—
3.5
—
2.5
—
0.5
—
2.5
—
0.5
—
3.5
—
0.5
—
10
—
15
—
10
—
—
15
3.5
—
0
—
1(5)
6
1(5)
6
—
5
—
5
—
12.5
—
5
—
12.5
—
5
—
12.5
5
—
7
—
Com’l & Ind’l(2)
TQFP Only
Commercial
TQFP Only
IDT72V263L10
IDT72V273L10
IDT72V283L10
IDT72V293L10
Min.
Max.
—
100
1(5)
6.5
10
—
4.5
—
4.5
—
3.5
—
0.5
—
3.5
—
0.5
—
3.5
—
0.5
—
10
—
15
—
10
—
—
15
3.5
—
0
—
1(5)
6
1(5)
6
—
6.5
—
6.5
—
16
—
6.5
—
16
—
6.5
—
16
7
—
10
—
IDT72V263L15
IDT72V273L15
IDT72V283L15
IDT72V293L15
Min.
Max.
—
66.7
1(5)
10
15
—
6
—
6
—
4
—
1
—
4
—
1
—
4
—
1
—
15
—
15
—
15
—
—
15
4
—
0
—
1(5)
8
1(5)
8
—
10
—
10
—
20
—
10
—
20
—
10
—
20
9
—
14
—
NOTES:
1. All AC timings apply to both Standard IDT mode and First Word Fall Through mode.
2. Industrial temperature range product for the 10ns is available as a standard device. All other speed grades are available by special order.
3. Pulse widths less than minimum values are not allowed.
4. Values guaranteed by design, not currently tested.
5. TQFP package only: for speed grades 7.5ns, 10ns and 15ns the minimum for tA, tOE, and tOHZ is 2ns.
6. The IDT72V223/72V233/72V243/72V253 are only available in 6ns and 7.5ns speed grades.
9
Unit
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
IDT72V223/233/243/253/263/273/283/293 3.3V HIGH DENSITY SUPERSYNC IITM NARROW BUS FIFO
512 x 18, 1K x 9/18, 2K x 9/18, 4K x 9/18, 8K x 9/18, 16K x 9/18, 32K x 9/18, 64K x 9/18, 128K x 9
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
AC ELECTRICAL CHARACTERISTICS(1) — ASYNCHRONOUS TIMING
(Commercial: VCC = 3.3V ± 0.15V, TA = 0°C to +70°C;Industrial: VCC = 3.3V ± 0.15V, TA = -40°C to +85°C; JEDEC JESD8-A compliant)
Commercial
Symbol
fA(4)
tAA(4)
tCYC(4)
tCYH(4)
tCYL(4)
tRPE(4)
tFFA(4)
tEFA(4)
tPAFA(4)
tPAEA(4)
IDT72V223L6
IDT72V233L6
IDT72V243L6
IDT72V253L6
IDT72V263L6
IDT72V273L6
IDT72V283L6
IDT72V293L6
Min.
Max.
—
100
0.6
8
10
—
4.5
—
4.5
—
8
—
—
8
—
8
—
8
—
8
Parameter
Cycle Frequency (Asynchronous mode)
Data Access Time
Cycle Time
Cycle HIGH Time
Cycle LOW Time
Read Pulse after EF HIGH
Clock to Asynchronous FF
Clock to Asynchronous EF
Clock to Asynchronous Programmable Almost-Full Flag
Clock to Asynchronous Programmable Almost-Empty Flag
NOTES:
1. All AC timings apply to both Standard IDT mode and First Word Fall Through mode.
2. Pulse widths less than minimum values are not allowed.
3. Values guaranteed by design, not currently tested.
4. Parameters apply to the BGA package only.
10
IDT72V223L7-5
IDT72V233L7-5
IDT72V243L7-5
IDT72V253L7-5
IDT72V263L7-5
IDT72V273L7-5
IDT72V283L7-5
IDT72V293L7-5
Min.
Max.
—
83
0.6
10
12
—
5
—
5
—
10
—
—
10
—
10
—
10
—
10
Unit
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
BUS FIFO
IDT72V223/233/243/253/263/273/283/293
3.3V
HIGH DENSITY
SUPERSYNC
IITM NARROW
IDT72V263/273/283/293/103/113
3.3V HIGH
DENSITY
SUPERSYNC
IITM NARROW
BUS FIFO
8K
9/18,2K
32K
x 9/18,
x 9/18,
9/18,x256K
9/18,
512K64K
x9 x 9/18, 128K x 9
512xx18,
18,16K
1K xx 9/18,
x 9/18,
4K64K
x 9/18,
8K 128K
x 9/18,x 16K
9/18, x32K
x 9/18,
AC TEST CONDITIONS
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
AC TEST LOADS - 6ns, 7.5ns Speed Grade
Input Pulse Levels
Input Rise/Fall Times
Input Timing Reference Levels
Output Reference Levels
Output Load for tCLK = 10ns, 15 ns
Output Load for tCLK = 6ns, 7.5ns
GND to 3.0V
3ns(1)
1.5V
1.5V
See Figure 2a
See Figure 2b & 2c
1.5V
50Ω
Z0 = 50Ω
I/O
4666 drw04a
NOTE:
1. For 166Mhz and 133MHz operation input rise/fall times are 1.5ns.
Figure 2b. AC Test Load
AC TEST LOADS - 10ns, 15ns Speed Grades
6
tCD
(Typical, ns)
5
3.3V
330Ω
4
3
2
1
D.U.T.
20 30 50
30pF*
510Ω
80 100
Capacitance (pF)
200
4666 drw04b
4666 drw04
Figure 2c. Lumped Capacitive Load, Typical Derating
Figure 2a. Output Load
* Includes jig and scope capacitances.
OUTPUT ENABLE & DISABLE TIMING
Output
Enable
Output
Disable
VIH
OE
VIL
tOE & tOLZ
Output VCC
Normally
2
LOW
Output
Normally VCC
2
HIGH
tOHZ
VCC
2
100mV
100mV
VOL
VOH
100mV
100mV
VCC
2
4666 drw04c
NOTE:
1. REN is HIGH.
11
IDT72V223/233/243/253/263/273/283/293 3.3V HIGH DENSITY SUPERSYNC IITM NARROW BUS FIFO
512 x 18, 1K x 9/18, 2K x 9/18, 4K x 9/18, 8K x 9/18, 16K x 9/18, 32K x 9/18, 64K x 9/18, 128K x 9
FUNCTIONAL DESCRIPTION
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
writes for the IDT72V293. The offset “m” is the full offset value. The default setting
for these values are stated in the footnote of Table 2. This parameter is also user
programmable. See section on Programmable Flag Offset Loading.
When the FIFO is full, the Full Flag (FF) will go LOW, inhibiting further write
operations. If no reads are performed after a reset, FF will go LOW after D writes
to the FIFO. If the x18 Input or x18 Output bus Width is selected, D = 512 writes
for the IDT72V223, 1,024 writes for the IDT72V233, 2,048 writes for the
IDT72V243, 4,096 writes for the IDT72V253, 8,192 writes for the IDT72V263,
16,384 writes for the IDT72V273, 32,768 writes for the IDT72V283 and 65,536
writes for the IDT72V293. If both x9 Input and x9 Output bus Widths are selected,
D = 1024 writes for the IDT72V223, 2,048 writes for the IDT72V233, 4,096
writes for the IDT72V243, 8,192 writes for the IDT72V253, 16,384 writes for
the IDT72V263, 32,768 writes for the IDT72V273, 65,536 writes for the
IDT72V283 and 131,072 writes for the IDT72V293, respectively.
If the FIFO is full, the first read operation will cause FF to go HIGH.
Subsequent read operations will cause PAF and HF to go HIGH at the conditions
described in Table 3. If further read operations occur, without write operations,
PAE will go LOW when there are n words in the FIFO, where n is the empty
offset value. Continuing read operations will cause the FIFO to become empty.
When the last word has been read from the FIFO, the EF will go LOW inhibiting
further read operations. REN is ignored when the FIFO is empty.
When configured in IDT Standard mode, the EF and FF outputs are double
register-buffered outputs.
Relevant timing diagrams for IDT Standard mode can be found in Figure
7, 8 and 11.
TIMING MODES: IDT STANDARD vs FIRST WORD FALL THROUGH
(FWFT) MODE
The IDT72V223/72V233/72V243/72V253/72V263/72V273/72V283/
72V293 support two different timing modes of operation: IDT Standard mode
or First Word Fall Through (FWFT) mode. The selection of which mode will
operate is determined during Master Reset, by the state of the FWFT/SI input.
If, at the time of Master Reset, FWFT/SI is LOW, then IDT Standard mode
will be selected. This mode uses the Empty Flag (EF) to indicate whether or
not there are any words present in the FIFO. It also uses the Full Flag function
(FF) to indicate whether or not the FIFO has any free space for writing. In IDT
Standard mode, every word read from the FIFO, including the first, must be
requested using the Read Enable (REN) and RCLK.
If, at the time of Master Reset, FWFT/SI is HIGH, then FWFT mode will be
selected. This mode uses Output Ready (OR) to indicate whether or not there
is valid data at the data outputs (Qn). It also uses Input Ready (IR) to indicate
whether or not the FIFO has any free space for writing. In the FWFT mode,
the first word written to an empty FIFO goes directly to Qn after three RCLK rising
edges, REN = LOW is not necessary. Subsequent words must be accessed
using the Read Enable (REN) and RCLK.
Various signals, both input and output signals operate differently depending
on which timing mode is in effect.
IDT STANDARD MODE
In this mode, the status flags, FF, PAF, HF, PAE, and EF operate in the
manner outlined in Table 3. To write data into to the FIFO, Write Enable (WEN)
must be LOW. Data presented to the DATA IN lines will be clocked into the FIFO
on subsequent transitions of the Write Clock (WCLK). After the first write is
performed, the Empty Flag (EF) will go HIGH. Subsequent writes will continue
to fill up the FIFO. The Programmable Almost-Empty flag (PAE) will go HIGH
after n + 1 words have been loaded into the FIFO, where n is the empty offset
value. The default setting for these values are stated in the footnote of Table 2.
This parameter is also user programmable. See section on Programmable Flag
Offset Loading.
If one continued to write data into the FIFO, and we assumed no read
operations were taking place, the Half-Full flag (HF) would toggle to LOW once
(D/2 + 1) words were written into the FIFO. If x18 Input or x18 Output bus Width
is selected, (D/2 + 1) = the 257th word for the IDT72V223, 513rd word for
IDT72V233, 1,025th word for the IDT72V243, 2,049th word for the IDT72V253,
4,097th word for the IDT72V263, 8,193th word for IDT72V273, 16,385th word
for the IDT72V283 and 32,769th word for the IDT72V293. If both x9 Input and
x9 Output bus Widths are selected, (D/2 + 1) = the 513rd word for the
IDT72V223, 1,025th word for IDT72V233, 2,049th word for the IDT72V243,
4,097th word for the IDT72V253, 8,193rd word for the IDT72V263, 16,385th
word for IDT72V273, 32,769th word for the IDT72V283 and 65,537th word
for the IDT72V293. Continuing to write data into the FIFO will cause the
Programmable Almost-Full flag (PAF) to go LOW. Again, if no reads are
performed, the PAF will go LOW after (D-m) writes to the FIFO. If x18 Input or
x18 Output bus Width is selected, (D-m) = (512-m) writes for the IDT72V223,
(1,024-m) writes for the IDT72V233, (2,048-m) writes for the IDT72V243 and
(4,096-m) writes for the IDT72V253, (8,192-m) writes for the IDT72V263,
(16,384-m) writes for the IDT72V273, (32,768-m) writes for the IDT72V283
and (65,536-m) writes for the IDT72V293. If both x9 Input and x9 Output bus
Widths are selected, (D-m) = (1,024-m) writes for the IDT72V223, (2,048-m)
writes for the IDT72V233, (4,096-m) writes for the IDT72V243, (8,192-m)
writes for the IDT72V253, (16,384-m) writes for the IDT72V263, (32,768-m)
writes for the IDT72V273, (65,536-m) writes for the IDT72V283 and (131,072-m)
FIRST WORD FALL THROUGH MODE (FWFT)
In this mode, the status flags, IR, PAF, HF, PAE, and OR operate in the
manner outlined in Table 4. To write data into the FIFO, WEN must be LOW.
Data presented to the DATA IN lines will be clocked into the FIFO on subsequent
transitions of WCLK. After the first write is performed, the Output Ready (OR)
flag will go LOW. Subsequent writes will continue to fill up the FIFO. PAE will go
HIGH after n+2 words have been loaded into the FIFO, where n is the empty
offset value. The default setting for these values are stated in the footnote of Table
2. This parameter is also user programmable. See section on Programmable
Flag Offset Loading.
If one continued to write data into the FIFO, and we assumed no read
operations were taking place, the HF would toggle to LOW once the (D/2 + 2)
words were written into the FIFO. If x18 Input or x18 Output bus Width is selected,
(D/2 + 2) = the 258th word for the IDT72V223, 514th word for IDT72V233,
1,026th word for the IDT72V243, 2,050th word for the IDT72V253, 4,098th
word for the IDT72V263, 8,194th word for IDT72V273, 16,386th word for the
IDT72V283 and 32,770th word for the IDT72V293. If both x9 Input and x9
Output bus Widths are selected, (D/2 + 2) = the 514th word for the IDT72V223,
1,026th word for IDT72V233, 2,050th word for the IDT72V243, 4,098th word
for the IDT72V253, 8,194th word for the IDT72V263, 16,386th word for
IDT72V273, 32,770th word for the IDT72V283 and 65,538th word for the
IDT72V293. Continuing to write data into the FIFO will cause the PAF to go LOW.
Again, if no reads are performed, the PAF will go LOW after (D-m) writes to the
FIFO. If x18 Input or x18 Output bus Width is selected, (D-m) = (513-m) writes
for the IDT72V223, (1,025-m) writes for the IDT72V233, (2,049-m) writes for
the IDT72V243, (4,097-m) writes for the IDT72V253, (8,193-m) writes for the
IDT72V263, (16,385-m) writes for the IDT72V273, (32,769-m) writes for the
IDT72V283 and (65,537-m) writes for the IDT72V293. If both x9 Input and x9
Output bus Widths are selected, (D-m) = (1,025-m) writes for the IDT72V223,
(2,049-m) writes for the IDT72V233, (4,097-m) writes for the IDT72V243,
(8,193-m) writes for the IDT72V253, (16,385-m) writes for the IDT72V263,
12
BUS FIFO
IDT72V223/233/243/253/263/273/283/293
3.3V
HIGH DENSITY
SUPERSYNC
IITM NARROW
IDT72V263/273/283/293/103/113
3.3V HIGH
DENSITY
SUPERSYNC
IITM NARROW
BUS FIFO
8K
9/18,2K
32K
x 9/18,
x 9/18,
9/18,x256K
9/18,
512K64K
x9 x 9/18, 128K x 9
512xx18,
18,16K
1K xx 9/18,
x 9/18,
4K64K
x 9/18,
8K 128K
x 9/18,x 16K
9/18, x32K
x 9/18,
(32,769-m) writes for the IDT72V273, (65,537-m) writes for the IDT72V283
and (131,073-m) writes for the IDT72V293. The offset m is the full offset value.
The default setting for these values are stated in the footnote of Table 2.
When the FIFO is full, the Input Ready (IR) flag will go HIGH, inhibiting further
write operations. If no reads are performed after a reset, IR will go HIGH after
D writes to the FIFO. If x18 Input or x18 Output bus Width is selected, D = 513
writes for the IDT72V223, 1,025 writes for the IDT72V233, 2,049 writes for the
IDT72V243, 4,097 writes for the IDT72V253, 8,193 writes for the IDT72V263,
16,385 writes for the IDT72V273, 32,769 writes for the IDT72V283 and 65,537
writes for the IDT72V293. If both x9 Input and x9 Output bus Widths are selected,
D = 1,025 writes for the IDT72V223, 2,049 writes for the IDT72V233, 4,097
writes for the IDT72V243, 8,193 writes for the IDT72V253, 16,385 writes for
the IDT72V263, 32,769 writes for the IDT72V273, 65,537 writes for the
IDT72V283 and 131,073 writes for the IDT72V293, respectively. Note that the
additional word in FWFT mode is due to the capacity of the memory plus output
register.
If the FIFO is full, the first read operation will cause the IR flag to go LOW.
Subsequent read operations will cause the PAF and HF to go HIGH at the
conditions described in Table 4. If further read operations occur, without write
operations, the PAE will go LOW when there are n+1 words in the FIFO, where
n is the empty offset value. Continuing read operations will cause the FIFO to
become empty. When the last word has been read from the FIFO, OR will go
HIGH inhibiting further read operations. REN is ignored when the FIFO is empty.
When configured in FWFT mode, the OR flag output is triple registerbuffered, and the IR flag output is double register-buffered.
Relevant timing diagrams for FWFT mode can be found in Figure 9, 10 and
12.
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
be programmed into the FIFO in one of two ways; serial or parallel loading
method. The selection of the loading method is done using the LD (Load) pin.
During Master Reset, the state of the LD input determines whether serial or
parallel flag offset programming is enabled. A HIGH on LD during Master Reset
selects serial loading of offset values. A LOW on LD during Master Reset selects
parallel loading of offset values.
In addition to loading offset values into the FIFO, it is also possible to read
the current offset values. Offset values can be read via the parallel output port
Q0-Qn, regardless of the programming mode selected (serial or parallel). It is
not possible to read the offset values in serial fashion.
Figure 3, Programmable Flag Offset Programming Sequence, summaries
the control pins and sequence for both serial and parallel programming modes.
For a more detailed description, see discussion that follows.
The offset registers may be programmed (and reprogrammed) any time after
Master Reset, regardless of whether serial or parallel programming has been
selected. Valid programming ranges are from 0 to D-1.
SYNCHRONOUS vs ASYNCHRONOUS PROGRAMMABLE FLAG
TIMING SELECTION
The IDT72V223/72V233/72V243/72V253/72V263/72V273/72V283/
72V293 can be configured during the Master Reset cycle with either synchronous or asynchronous timing for PAF and PAE flags by use of the PFM pin.
If synchronous PAF/PAE configuration is selected (PFM, HIGH during
MRS), the PAF is asserted and updated on the rising edge of WCLK only and
not RCLK. Similarly, PAE is asserted and updated on the rising edge of RCLK
only and not WCLK. For detail timing diagrams, see Figure 18 for synchronous
PAF timing and Figure 19 for synchronous PAE timing.
If asynchronous PAF/PAE configuration is selected (PFM, LOW during
MRS), the PAF is asserted LOW on the LOW-to-HIGH transition of WCLK and
PAF is reset to HIGH on the LOW-to-HIGH transition of RCLK. Similarly, PAE
is asserted LOW on the LOW-to-HIGH transition of RCLK. PAE is reset to HIGH
on the LOW-to-HIGH transition of WCLK. For detail timing diagrams, see Figure
20 for asynchronous PAF timing and Figure 21 for asynchronous PAE timing.
PROGRAMMING FLAG OFFSETS
Full and Empty Flag offset values are user programmable. The IDT72V223/
72V233/72V243/72V253/72V263/72V273/72V283/72V293 has internal registers for these offsets. There are eight default offset values selectable during
Master Reset. These offset values are shown in Table 2. Offset values can also
TABLE 2  DEFAULT PROGRAMMABLE FLAG OFFSETS
IDT72V223
IDT72V233
IDT72V253
IDT72V263
IDT72V273
IDT72V243
Offsets n,m
LD
L
L
L
H
H
H
H
L
H
L
FSEL0 FSEL1
L
H
H
L
H
H
L
H
L
L
H
L
H
H
L
L
X
X
X
X
Offsets n,m
All Other x9 to x9
All Modes
Modes
Mode
511
511
511
255
255
255
63
63
63
15
15
31
31
31
1,023
7
7
15
3
3
7
127
127
127
Serial Programming Mode(3)
Parallel Programming Mode(4)
Offsets n,m
All Modes
511
255
63
31
1,023
15
7
127
IDT72V283
IDT72V293
Offsets n,m
All Other x9 to x9
Modes
Mode
511
16,383
255
8,191
63
4,095
31
2,047
1,023
1,023
15
511
7
255
127
127
Offsets n,m
NOTES:
1. n = empty offset for PAE.
2. m = full offset for PAF.
3. As well as selecting serial programming mode, one of the default values will also be loaded depending on the state of FSEL0 & FSEL1.
4. As well as selecting parallel programming mode, one of the default values will also be loaded depending on the state of FSEL0 & FSEL1.
13
All Modes
16,383
8,191
4,095
2,047
1,023
511
255
127
IDT72V223/233/243/253/263/273/283/293 3.3V HIGH DENSITY SUPERSYNC IITM NARROW BUS FIFO
512 x 18, 1K x 9/18, 2K x 9/18, 4K x 9/18, 8K x 9/18, 16K x 9/18, 32K x 9/18, 64K x 9/18, 128K x 9
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
TABLE 3  STATUS FLAGS FOR IDT STANDARD MODE
IW = OW = x9
IW ≠ OW or
IW = OW = x18
IDT72V223
IDT72V223
IDT72V233
IDT72V243
IDT72V233
IDT72V243
IDT72V253
0
1 to n
Number of
Words in
FIFO(2)
0
1 to n
0
0
1 to n
1 to n
H
L
L
H
H
L
H
(n+1) to 512
(n+1) to 1,024
(n+1) to 2,048
H
H
H
H
H
1,025 to (2,048-(m+1))
2,049 to (4,096-(m+1))
H
H
L
H
H
(512-m) to 511
(1,024-m) to 1,023
(2,048-m) to 2,047
H
L
L
H
H
L
L
L
H
H
1,024
2,048
(4,096-m) to 4,095
4,096
IDT72V253
IDT72V263
IDT72V273
IDT72V283
IW ≠ OW or
IW = OW = x18
IDT72V263
IDT72V273
IDT72V283
IDT72V293
0
0
1 to n
FIFO
H
H
513 to (1,024-(m+1))
(n+1) to 256
IW = OW = x9
(2)
H
257 to (512-(m+1))
512
Number of
Words in
FF PAF HF PAE EF
FF PAF HF PAE EF
0
0
1 to n
IDT72V293
0
1 to n
1 to n
1 to n
H
H
H
L
L
H
H
H
L
H
(n+1) to 4,096
(n+1) to 8,192
(n+1) to 16,384
(n+1) to 32,768
(n+1) to 65,536
H
H
H
H
H
4,097 to (8,192-(m+1))
8,193 to (16,384-(m+1))
16,385 to (32,768-(m+1))
32,769 to (65,536-(m+1))
65,537 to (131,072-(m+1))
H
H
L
H
H
(16,384-m) to 16,383
(32,768-m) to 32,767
(65,536-m) to 65,535
(131,072-m) to 131,071
H
L
L
H
H
16,384
32,768
65,536
L
L
L
H
H
(8,192-m) to 8,191
8,192
131,072
NOTE:
1. See Table 2 for values for n, m.
TABLE 4  STATUS FLAGS FOR FWFT MODE
IW = OW = x9
IW ≠ OW or
IW = OW = x18
Number of
Words in
(2)
FIFO
IDT72V223
IDT72V223
IDT72V233
IDT72V243
IDT72V233
IDT72V243
IDT72V253
IR
0
0
0
0
L
H
H
L
H
1 to n+1
1 to n+1
1 to n+1
1 to n+1
L
H
H
L
L
(n+2) to 513
(n+2) to 1,025
(n+2) to 2,049
L
H
H
H
L
258 to (513-(m+1))
514 to (1,025-(m+1))
1,026 to (2,049-(m+1))
2,050 to (4,097-(m+1))
L
H
L
H
L
(513-m) to 512
(1,025-m) to 1,024
(2,049-m) to 2,048
L
L
L
H
L
H
L
L
H
L
(n+2) to 257
513
1,025
2,049
(4,097-m) to 4,096
4,097
IW = OW = x9
IDT72V253
IDT72V263
IDT72V273
IDT72V283
IW ≠ OW or
IW = OW = x18
IDT72V263
IDT72V273
IDT72V283
IDT72V293
Number of
Words in
FIFO(2)
PAF HF PAE OR
IDT72V293
IR
PAF HF PAE OR
0
0
0
0
0
L
H
H
L
H
1 to n+1
1 to n+1
1 to n+1
1 to n+1
1 to n+1
L
H
H
L
L
(n+2) to 4,097
(n+2) to 8,193
(n+2) to 16,385
(n+2) to 32,769
(n+2) to 65,537
L
H
H
H
L
4,098 to (8,193-(m+1))
8,194 to (16,385-(m+1))
16,386 to (32,769-(m+1))
32,770 to (65,537-(m+1))
65,538 to (131,073-(m+1))
L
H
L
H
L
(16,385-m) to 16,384
(32,769-m) to 32,768
(65,537-m) to 65,536
(131,073-m) to 131,072
L
L
L
H
L
16,385
32,769
65,537
H
L
L
H
(8,193-m) to 8,192
8,193
131,073
L
4666 drw05
NOTE:
1. See Table 2 for values for n, m.
2. Number of Words in FIFO = FIFO Depth + Output Register
14
BUS FIFO
IDT72V223/233/243/253/263/273/283/293
3.3V
HIGH DENSITY
SUPERSYNC
IITM NARROW
IDT72V263/273/283/293/103/113
3.3V HIGH
DENSITY
SUPERSYNC
IITM NARROW
BUS FIFO
8K
9/18,2K
32K
x 9/18,
x 9/18,
9/18,x256K
9/18,
512K64K
x9 x 9/18, 128K x 9
512xx18,
18,16K
1K xx 9/18,
x 9/18,
4K64K
x 9/18,
8K 128K
x 9/18,x 16K
9/18, x32K
x 9/18,
1st Parallel Offset Write/Read Cycle
1st Parallel Offset Write/Read Cycle
D/Q8
D/Q8
D/Q0
D/Q0
EMPTY OFFSET REGISTER
EMPTY OFFSET REGISTER
8
7
6
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
5
4
3
2
8
1
7
6
5
4
3
2
1
2nd Parallel Offset Write/Read Cycle
D/Q8
D/Q0
EMPTY OFFSET REGISTER
2nd Parallel Offset Write/Read Cycle
D/Q8
D/Q0
16
15
14
13
12
11
10
9
EMPTY OFFSET REGISTER
16
15
14
13
12
11
10
3rd Parallel Offset Write/Read Cycle
9
D/Q8
D/Q0
EMPTY OFFSET REGISTER
19
3rd Parallel Offset Write/Read Cycle
D/Q8
18
17
D/Q0
4th Parallel Offset Write/Read Cycle
FULL OFFSET REGISTER
8
7
6
5
4
D/Q8
3
2
D/Q0
FULL OFFSET REGISTER
1
8
D/Q8
13
4
3
2
1
D/Q0
FULL OFFSET REGISTER
FULL OFFSET REGISTER
14
5
D/Q8
D/Q0
1
5
6
5th Parallel Offset Write/Read Cycle
4th Parallel Offset Write/Read Cycle
16
7
12
11
10
16
9
15
14
13
12
11
10
9
6th Parallel Offset Write/Read Cycle
D/Q8
IDT72V223/72V233/72V243/72V253/72V263/
72V273/72V283/72V293(2) x9 Bus Width
D/Q0
FULL OFFSET REGISTER
17
1st Parallel Offset Write/Read Cycle
D/Q17
D/Q16
Data Inputs/Outputs
EMPTY OFFSET REGISTER
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
8 7 6 5 4 3 2 1
16 15 14 13 12 11 10 9
D/Q8
IDT72V293(2) x9 Bus Width
D/Q0
# of Bits Used
Non-Interspersed
Parity
Interspersed
Parity
2nd Parallel Offset Write/Read Cycle
D/Q17
D/Q16
Data Inputs/Outputs
D/Q0
FULL OFFSET REGISTER
16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
16 15 14 13 12 11 10 9
8 7 6 5 4 3 2 1
D/Q8
x9 to x9 Mode
All Other Modes
# of Bits Used:
10 bits for the IDT72V223
11 bits for the IDT72V233
12 bits for the IDT72V243
13 bits for the IDT72V253
14 bits for the IDT72V263
15 bits for the IDT72V273
16 bits for the IDT72V283
17 bits for the IDT72V293
# of Bits Used:
9 bits for the IDT72V223
10 bits for the IDT72V233
11 bits for the IDT72V243
12 bits for the IDT72V253
13 bits for the IDT72V263
14 bits for the IDT72V273
15 bits for the IDT72V283
16 bits for the IDT72V293
Note: All unused bits of the
LSB & MSB are don't care
Note: All unused bits of the
LSB & MSB are don't care
IDT72V223/72V233/72V243/72V253/72V263/72V273/
72V283/72V293 x18 Bus Width
4666 drw06
NOTES:
1. When programming the IDT72V293 with an input bus width of x9 and output bus width of x18, 4 write cycles will be required. When Reading the IDT72V293 with an output bus
width of x9 and input bus width of x18, 4 read cycles will be required.
2. A total of 6 program/ read cycles will be required for x9 bus width if both the input and output bus widths are set to x9.
Figure 3. Programmable Flag Offset Programming Sequence
15
IDT72V223/233/243/253/263/273/283/293 3.3V HIGH DENSITY SUPERSYNC IITM NARROW BUS FIFO
512 x 18, 1K x 9/18, 2K x 9/18, 4K x 9/18, 8K x 9/18, 16K x 9/18, 32K x 9/18, 64K x 9/18, 128K x 9
LD WEN REN SEN WCLK
0
0
1
1
0
1
0
1
IDT72V223, IDT72V233
IDT72V243, IDT72V253
IDT72V263, IDT72V273
IDT72V283, IDT72V293
RCLK
Parallel write to registers:
Empty Offset (LSB)
Empty Offset (MSB)
Full Offset (LSB)
Full Offset (MSB)
X
Parallel read from registers:
Empty Offset (LSB)
Empty Offset (MSB)
Full Offset (LSB)
Full Offset (MSB)
X
x9 to x9 Mode
0
1
1
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
0
X
X
X
1
1
1
1
0
X
X
1
X
0
X
X
1
1
1
X
X
Serial shift into registers:
20 bits for the IDT72V223
22 bits for the IDT72V233
24 bits for the IDT72V243
26 bits for the IDT72V253
28 bits for the IDT72V263
30 bits for the IDT72V273
32 bits for the IDT72V283
34 bits for the IDT72V293
1 bit for each rising WCLK edge
Starting with Empty Offset (LSB)
Ending with Full Offset (MSB)
All Other Modes
Serial shift into registers:
18 bits for the IDT72V223
20 bits for the IDT72V233
22 bits for the IDT72V243
24 bits for the IDT72V253
26 bits for the IDT72V263
28 bits for the IDT72V273
30 bits for the IDT72V283
32 bits for the IDT72V293
1 bit for each rising WCLK edge
Starting with Empty Offset (LSB)
Ending with Full Offset (MSB)
X
No Operation
X
Write Memory
Read Memory
X
No Operation
NOTES:
1. The programming method can only be selected at Master Reset.
2. Parallel reading of the offset registers is always permitted regardless of which programming method has been selected.
3. The programming sequence applies to both IDT Standard and FWFT modes.
Figure 3. Programmable Flag Offset Programming Sequence (Continued)
16
4666 drw06a
BUS FIFO
IDT72V223/233/243/253/263/273/283/293
3.3V
HIGH DENSITY
SUPERSYNC
IITM NARROW
IDT72V263/273/283/293/103/113
3.3V HIGH
DENSITY
SUPERSYNC
IITM NARROW
BUS FIFO
8K
9/18,2K
32K
x 9/18,
x 9/18,
9/18,x256K
9/18,
512K64K
x9 x 9/18, 128K x 9
512xx18,
18,16K
1K xx 9/18,
x 9/18,
4K64K
x 9/18,
8K 128K
x 9/18,x 16K
9/18, x32K
x 9/18,
SERIAL PROGRAMMING MODE
If Serial Programming mode has been selected, as described above, then
programming of PAE and PAF values can be achieved by using a combination
of the LD, SEN, WCLK and SI input pins. Programming PAE and PAF proceeds
as follows: when LD and SEN are set LOW, data on the SI input are written,
one bit for each WCLK rising edge, starting with the Empty Offset LSB and ending
with the Full Offset MSB. If x9 to x9 mode is selected, a total of 20 bits for the
IDT72V223, 22 bits for the IDT72V233, 24 bits for the IDT72V243, 26 bits for
the IDT72V253, 28 bits for the IDT72V263, 30 bits for the IDT72V273, 32 bits
for the IDT72V283 and 34 bits for the IDT72V293. For any other mode of
operation (that includes x18 bus width on either the Input or Output), minus 2
bits from the values above. So, a total of 18 bits for the IDT72V223, 20 bits for
the IDT72V233, 22 bits for the IDT72V243, 24 bits for the IDT72V253, 26 bits
for the IDT72V263, 28 bits for the IDT72V273, 30 bits for the IDT72V283 and
32 bits for the IDT72V293. See Figure 15, Serial Loading of Programmable
Flag Registers, for the timing diagram for this mode.
Using the serial method, individual registers cannot be programmed
selectively. PAE and PAF can show a valid status only after the complete set
of bits (for all offset registers) has been entered. The registers can be
reprogrammed as long as the complete set of new offset bits is entered. When
LD is LOW and SEN is HIGH, no serial write to the registers can occur.
Write operations to the FIFO are allowed before and during the serial
programming sequence. In this case, the programming of all offset bits does not
have to occur at once. A select number of bits can be written to the SI input and
then, by bringing LD and SEN HIGH, data can be written to FIFO memory via
Dn by toggling WEN. When WEN is brought HIGH with LD and SEN restored
to a LOW, the next offset bit in sequence is written to the registers via SI. If an
interruption of serial programming is desired, it is sufficient either to set LD LOW
and deactivate SEN or to set SEN LOW and deactivate LD. Once LD and SEN
are both restored to a LOW level, serial offset programming continues.
From the time serial programming has begun, neither programmable flag
will be valid until the full set of bits required to fill all the offset registers has been
written. Measuring from the rising WCLK edge that achieves the above criteria;
PAF will be valid after two more rising WCLK edges plus tPAF, PAE will be valid
after the next two rising RCLK edges plus tPAE plus tSKEW2.
It is not possible to read the flag offset values in a serial mode.
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
LOW-to-HIGH transition of WCLK. Upon the second LOW-to-HIGH transition
of WCLK, data are written into the MSB of the Empty Offset Register. On the third
LOW-to-HIGH transition of WCLK, data are written into the LSB of the Full Offset
Register. On the fourth LOW-to-HIGH transition of WCLK, data are written into
the MSB of the Full Offset Register. The fifth LOW-to-HIGH transition of WCLK,
data are written, once again to the Empty Offset Register. Note that for x9 bus
width, one extra Write cycle is required for both the Empty Offset Register and
Full Offset Register. See Figure 16, Parallel Loading of Programmable Flag
Registers, for the timing diagram for this mode.
The act of writing offsets in parallel employs a dedicated write offset register
pointer. The act of reading offsets employs a dedicated read offset register
pointer. The two pointers operate independently; however, a read and a write
should not be performed simultaneously to the offset registers. A Master Reset
initializes both pointers to the Empty Offset (LSB) register. A Partial Reset has
no effect on the position of these pointers. Refer to Figure 3, Programmable
Flag Offset Programming Sequence, for a detailed diagram of the data input
lines D0-Dn used during parallel programming.
Write operations to the FIFO are allowed before and during the parallel
programming sequence. In this case, the programming of all offset registers
does not have to occur at one time. One, two or more offset registers can be
written and then by bringing LD HIGH, write operations can be redirected to
the FIFO memory. When LD is set LOW again, and WEN is LOW, the next offset
register in sequence is written to. As an alternative to holding WEN LOW and
toggling LD, parallel programming can also be interrupted by setting LD LOW
and toggling WEN.
Note that the status of a programmable flag (PAE or PAF) output is invalid
during the programming process. From the time parallel programming has
begun, a programmable flag output will not be valid until the appropriate offset
word has been written to the register(s) pertaining to that flag. Measuring from
the rising WCLK edge that achieves the above criteria; PAF will be valid after
two more rising WCLK edges plus tPAF, PAE will be valid after the next two rising
RCLK edges plus tPAE plus tSKEW2.
The act of reading the offset registers employs a dedicated read offset
register pointer. The contents of the offset registers can be read on the Q0-Qn
pins when LD is set LOW and REN is set LOW. If the FIFO is configured for an
input bus width and output bus width both set to x9, then the total number of read
operations required to read the offset registers is 4 for the IDT72V223/72V233/
72V243/72V253/72V263/72V273/72V283 or 6 for the IDT72V293. Refer to
Figure 3, Programmable Flag Offset Programming Sequence, for a detailed
diagram of the data input lines D0-Dn used during parallel programming. If the
FIFO is configured for an input to output bus width of x9 to x18, x18 to x9 or
x18 to x18, then the following number of read operations are required: for an
output bus width of x18 a total of 2 read operations will be required to read the
offset registers for the IDT72V223/72V233/72V243/72V253/72V263/72V273/
72V283/72V293. For an output bus width of x9 a total of 4 read operations will
be required to read the offset registers for the IDT72V223/72V233/72V243/
72V253/72V263/72V273/72V283/72V293. Refer to Figure 3, Programmable Flag Offset Programming Sequence, for a detailed diagram. For
example, reading PAE and PAF on the IDT72V293 configured for x18 bus
width proceeds as follows: data are read via Qn from the Empty Offset Register
on the first and second LOW-to-HIGH transition of RCLK. Upon the third and
fourth LOW-to-HIGH transition of RCLK, data are read from the Full Offset
Register. The fifth and sixth transition of RCLK reads, once again, from the
Empty Offset Register. Note that for a x9 bus width, one extra Read cycle is
required for both the Empty Offset Register and Full Offset Register. See Figure
17, Parallel Read of Programmable Flag Registers, for the timing diagram for
this mode.
PARALLEL PROGRAMMING MODE
If Parallel Programming mode has been selected, as described above, then
programming of PAE and PAF values can be achieved by using a combination
of the LD, WCLK , WEN and Dn input pins. If the FIFO is configured for an input
bus width and output bus width both set to x9, then the total number of write
operations required to program the offset registers is 4 for the IDT72V223/
72V233/72V243/72V253/72V263/72V273/72V283 or 6 for the IDT72V293.
Refer to Figure 3, Programmable Flag Offset Programming Sequence, for a
detailed diagram of the data input lines D0-Dn used during parallel programming. If the FIFO is configured for an input to output bus width of x9 to x18, x18
to x9 or x18 to x18, then the following number of write operations are required.
For an input bus width of x18 a total of 2 write operations will be required to
program the offset registers for the IDT72V223/72V233/72V243/72V253/
72V263/72V273/72V283/72V293. For an input bus width of x9 a total of 4 write
operations will be required to program the offset registers for the IDT72V223/
72V233/72V243/72V253/72V263/72V273/72V283/72V293. Refer to Figure
3, Programmable Flag Offset Programming Sequence, for a detailed diagram.
For example, programming PAE and PAF on the IDT72V293 configured
for x18 bus width proceeds as follows: when LD and WEN are set LOW, data
on the inputs Dn are written into the LSB of the Empty Offset Register on the first
17
IDT72V223/233/243/253/263/273/283/293 3.3V HIGH DENSITY SUPERSYNC IITM NARROW BUS FIFO
512 x 18, 1K x 9/18, 2K x 9/18, 4K x 9/18, 8K x 9/18, 16K x 9/18, 32K x 9/18, 64K x 9/18, 128K x 9
It is permissible to interrupt the offset register read sequence with reads or
writes to the FIFO. The interruption is accomplished by deasserting REN, LD,
or both together. When REN and LD are restored to a LOW level, reading of
the offset registers continues where it left off. It should be noted, and care should
be taken from the fact that when a parallel read of the flag offsets is performed,
the data word that was present on the output lines Qn will be overwritten.
Parallel reading of the offset registers is always permitted regardless of
which timing mode (IDT Standard or FWFT modes) has been selected.
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
IDT72V253, 16,385 for the IDT72V263, 32,769 for the IDT72V273, 65,537 for
the IDT72V283 and 131,073 for the IDT72V293.
If IDT Standard mode is selected, the FIFO will mark the beginning of the
Retransmit setup by setting EF LOW. The change in level will only be noticeable
if EF was HIGH before setup. During this period, the internal read pointer is
initialized to the first location of the RAM array.
When EF goes HIGH, Retransmit setup is complete and read operations
may begin starting with the first location in memory. Since IDT Standard mode
is selected, every word read including the first word following Retransmit setup
requires a LOW on REN to enable the rising edge of RCLK. See Figure 11,
Retransmit Timing (IDT Standard Mode), for the relevant timing diagram.
If FWFT mode is selected, the FIFO will mark the beginning of the Retransmit
setup by setting OR HIGH. During this period, the internal read pointer is set
to the first location of the RAM array.
When OR goes LOW, Retransmit setup is complete; at the same time, the
contents of the first location appear on the outputs. Since FWFT mode is selected,
the first word appears on the outputs, no LOW on REN is necessary. Reading
all subsequent words requires a LOW on REN to enable the rising edge of
RCLK. See Figure 12, Retransmit Timing (FWFT Mode), for the relevant timing
diagram.
For either IDT Standard mode or FWFT mode, updating of the PAE, HF and
PAF flags begin with the rising edge of RCLK that the RT is setup on. PAE is
synchronized to RCLK, thus on the second rising edge of RCLK after RT is setup,
the PAE flag will be updated. HF is asynchronous, thus the rising edge of RCLK
that RT is setup will update HF. PAF is synchronized to WCLK, thus the second
rising edge of WCLK that occurs tSKEW after the rising edge of RCLK that RT
is setup will update PAF. RT is synchronized to RCLK.
The Retransmit function has the option of 2 modes of operation, either "normal
latency" or "zero latency". Figure 11 and Figure 12 mentioned previously,
relate to "normal latency". Figure 13 and Figure 14 show "zero latency"
retransmit operation. Zero latency basically means that the first data word to be
retransmitted, is placed onto the output register with respect to the RCLK pulse
that initiated the retransmit.
RETRANSMIT OPERATION
The Retransmit operation allows data that has already been read to be
accessed again. There are 2 modes of Retransmit operation, normal latency
and zero latency. There are two stages to Retransmit: first, a setup procedure
that resets the read pointer to the first location of memory, then the actual
retransmit, which consists of reading out the memory contents, starting at the
beginning of memory.
Retransmit setup is initiated by holding RT LOW during a rising RCLK edge.
REN and WEN must be HIGH before bringing RT LOW. When zero latency is
utilized, REN does not need to be HIGH before bringing RT LOW. At least two
words, but no more than D - 2 words should have been written into the FIFO,
and read from the FIFO, between Reset (Master or Partial) and the time of
Retransmit setup. If x18 Input or x18 Output bus Width is selected, D = 512 for
the IDT72V223, 1,024 for the IDT72V233, 2,048 for the IDT72V243, 4,096 for
the IDT72V253, 8,192 for the IDT72V263, 16,384 for the IDT72V273, 32,768
for the IDT72V283 and 65,536 for the IDT72V293. If both x9 Input and x9 Output
bus Widths are selected, D = 1,024 for the IDT72V223, 2,048 for the
IDT72V233, 4,096 for the IDT72V243, 8,192 for the IDT72V253, 16,384 for
the IDT72V263, 32,768 for the IDT72V273, 65,536 for the IDT72V283 and
131,072 for the IDT72V293. In FWFT mode, if x18 Input or x18 Output bus Width
is selected, D = 513 for the IDT72V223, 1,025 for the IDT72V233, 2,049 for
the IDT72V243, 4,097 for the IDT72V253, 8,193 for the IDT72V263, 16,385
for the IDT72V273, 32,769 for the IDT72V283 and 65,537 for the IDT72V293.
If both x9 Input and x9 Output bus Widths are selected, D = 1,025 for the
IDT72V223, 2,049 for the IDT72V233, 4,097 for the IDT72V243, 8,193 for the
18
BUS FIFO
IDT72V223/233/243/253/263/273/283/293
3.3V
HIGH DENSITY
SUPERSYNC
IITM NARROW
IDT72V263/273/283/293/103/113
3.3V HIGH
DENSITY
SUPERSYNC
IITM NARROW
BUS FIFO
8K
9/18,2K
32K
x 9/18,
x 9/18,
9/18,x256K
9/18,
512K64K
x9 x 9/18, 128K x 9
512xx18,
18,16K
1K xx 9/18,
x 9/18,
4K64K
x 9/18,
8K 128K
x 9/18,x 16K
9/18, x32K
x 9/18,
SIGNAL DESCRIPTION
INPUTS:
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
Asynchronous operation of the read port will be selected. During Asynchronous
operation of the read port the RCLK input becomes RD input, this is the
Asynchronous read strobe input. A rising edge on RD will read data from the
FIFO via the output register and Qn port. (REN must be tied LOW during
Asynchronous operation of the read port).
The OE input provides three-state control of the Qn output bus, in an
asynchronous manner.
When the read port is configured for Asynchronous operation the device
must be operating on IDT standard mode, FWFT mode is not permissible if the
read port is Asynchronous. The Empty Flag (EF) operates in an Asynchronous
manner, that is, the empty flag will be updated based on both a read operation
and a write operation. Refer to figures 25, 26, 27 and 28 for relevant timing and
operational waveforms.
DATA IN (D0 - Dn)
Data inputs for 18-bit wide data (D0-D17) or data inputs for 9-bit wide data
(D0-D8).
CONTROLS:
MASTER RESET (MRS)
A Master Reset is accomplished whenever the MRS input is taken to a LOW
state. This operation sets the internal read and write pointers to the first location
of the RAM array. PAE will go LOW, PAF will go HIGH, and HF will go HIGH.
If FWFT/SI is LOW during Master Reset then the IDT Standard mode, along
with EF and FF are selected. EF will go LOW and FF will go HIGH. If FWFT/
SI is HIGH, then the First Word Fall Through mode (FWFT), along with IR and
OR, are selected. OR will go HIGH and IR will go LOW.
All control settings such as OW, IW, BE, RM, PFM and IP are defined during
the Master Reset cycle.
During a Master Reset, the output register is initialized to all zeroes. A Master
Reset is required after power up, before a write operation can take place. MRS
is asynchronous.
See Figure 5, Master Reset Timing, for the relevant timing diagram.
RETRANSMIT (RT)
The Retransmit operation allows data that has already been read to be
accessed again. There are 2 modes of Retransmit operation, normal latency
and zero latency. There are two stages to Retransmit: first, a setup procedure
that resets the read pointer to the first location of memory, then the actual
retransmit, which consists of reading out the memory contents, starting at the
beginning of the memory.
Retransmit setup is initiated by holding RT LOW during a rising RCLK edge.
REN and WEN must be HIGH before bringing RT LOW. When zero latency
is utilized, REN does not need to be HIGH before bringing RT LOW.
If IDT Standard mode is selected, the FIFO will mark the beginning of the
Retransmit setup by setting EF LOW. The change in level will only be noticeable
if EF was HIGH before setup. During this period, the internal read pointer is
initialized to the first location of the RAM array.
When EF goes HIGH, Retransmit setup is complete and read operations
may begin starting with the first location in memory. Since IDT Standard mode
is selected, every word read including the first word following Retransmit setup
requires a LOW on REN to enable the rising edge of RCLK. See Figure 11,
Retransmit Timing (IDT Standard Mode), for the relevant timing diagram.
If FWFT mode is selected, the FIFO will mark the beginning of the Retransmit
setup by setting OR HIGH. During this period, the internal read pointer is set
to the first location of the RAM array.
When OR goes LOW, Retransmit setup is complete; at the same time, the
contents of the first location appear on the outputs. Since FWFT mode is selected,
the first word appears on the outputs, no LOW on REN is necessary. Reading
all subsequent words requires a LOW on REN to enable the rising edge of
RCLK. See Figure 12, Retransmit Timing (FWFT Mode), for the relevant timing
diagram.
In Retransmit operation, zero-latency mode can be selected using the
Retransmit Mode (RM) pin during a Master Reset. This can be applied to both
IDT Standard mode and FWFT mode.
PARTIAL RESET (PRS)
A Partial Reset is accomplished whenever the PRS input is taken to a LOW
state. As in the case of the Master Reset, the internal read and write pointers
are set to the first location of the RAM array, PAE goes LOW, PAF goes HIGH,
and HF goes HIGH.
Whichever mode is active at the time of Partial Reset, IDT Standard mode
or First Word Fall Through, that mode will remain selected. If the IDT Standard
mode is active, then FF will go HIGH and EF will go LOW. If the First Word Fall
Through mode is active, then OR will go HIGH, and IR will go LOW.
Following Partial Reset, all values held in the offset registers remain
unchanged. The programming method (parallel or serial) currently active at
the time of Partial Reset is also retained. The output register is initialized to all
zeroes. PRS is asynchronous.
A Partial Reset is useful for resetting the device during the course of
operation, when reprogramming programmable flag offset settings may not be
convenient.
See Figure 6, Partial Reset Timing, for the relevant timing diagram.
ASYNCHRONOUS WRITE (ASYW)
The write port can be configured for either Synchronous or Asynchronous
mode of operation. If during Master Reset the ASYW input is LOW, then
Asynchronous operation of the write port will be selected. During Asynchronous operation of the write port the WCLK input becomes WR input, this is the
Asynchronous write strobe input. A rising edge on WR will write data present
on the Dn inputs into the FIFO. (WEN must be tied LOW when using the write
port in Asynchronous mode).
When the write port is configured for Asynchronous operation the full flag
(FF) operates in an asynchronous manner, that is, the full flag will be updated
based in both a write operation and read operation. Note, if Asynchronous
mode is selected, FWFT is not permissable. Refer to Figures 23, 24, 27 and
28 for relevant timing and operational waveforms.
RETRANSMIT LATENCY MODE (RM)
A zero-latency retransmit timing mode can be selected using the Retransmit
timing Mode pin (RM). During Master Reset, a LOW on RM will select zerolatency retransmit. A HIGH on RM during Master Reset will select normal
latency.
If zero-latency retransmit operation is selected the first data word to be
retransmitted will be placed on the output register with respect to the same RCLK
edge that initiated the retransmit based on RT being LOW.
Refer to Figure 13 for Retransmit Timing with zero latency (IDT Standard
Mode). Refer to Figure 14 for Retransmit Timing with zero latency (FWFT
Mode).
ASYNCHRONOUS READ (ASYR)
The read port can be configured for either Synchronous or Asynchronous
mode of operation. If during a Master Reset the ASYR input is LOW, then
19
IDT72V223/233/243/253/263/273/283/293 3.3V HIGH DENSITY SUPERSYNC IITM NARROW BUS FIFO
512 x 18, 1K x 9/18, 2K x 9/18, 4K x 9/18, 8K x 9/18, 16K x 9/18, 32K x 9/18, 64K x 9/18, 128K x 9
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
It is permissible to stop the RCLK. Note that while RCLK is idle, the EF/OR, PAE
and HF flags will not be updated. (Note that RCLK is only capable of updating
the HF flag to HIGH). The Write and Read Clocks can be independent or
coincident.
If Asynchronous operation has been selected this input is RD (Read
Strobe) . Data is Asynchronously read from the FIFO via the output register
whenever there is a rising edge on RD. In this mode the REN input must be
tied LOW. The OE input is used to provide Asynchronous control of the threestate Qn outputs.
FIRST WORD FALL THROUGH/SERIAL IN (FWFT/SI)
This is a dual purpose pin. During Master Reset, the state of the FWFT/
SI input determines whether the device will operate in IDT Standard mode or
First Word Fall Through (FWFT) mode.
If, at the time of Master Reset, FWFT/SI is LOW, then IDT Standard mode
will be selected. This mode uses the Empty Flag (EF) to indicate whether or not
there are any words present in the FIFO memory. It also uses the Full Flag
function (FF) to indicate whether or not the FIFO memory has any free space
for writing. In IDT Standard mode, every word read from the FIFO, including
the first, must be requested using the Read Enable (REN) and RCLK.
If, at the time of Master Reset, FWFT/SI is HIGH, then FWFT mode will be
selected. This mode uses Output Ready (OR) to indicate whether or not there
is valid data at the data outputs (Qn). It also uses Input Ready (IR) to indicate
whether or not the FIFO memory has any free space for writing. In the FWFT
mode, the first word written to an empty FIFO goes directly to Qn after three RCLK
rising edges, REN = LOW is not necessary. Subsequent words must be
accessed using the Read Enable (REN) and RCLK.
After Master Reset, FWFT/SI acts as a serial input for loading PAE and PAF
offsets into the programmable registers. The serial input function can only be
used when the serial loading method has been selected during Master Reset.
Serial programming using the FWFT/SI pin functions the same way in both IDT
Standard and FWFT modes.
READ ENABLE (REN)
When Read Enable is LOW, data is loaded from the RAM array into the output
register on the rising edge of every RCLK cycle if the device is not empty.
When the REN input is HIGH, the output register holds the previous data
and no new data is loaded into the output register. The data outputs Q0-Qn
maintain the previous data value.
In the IDT Standard mode, every word accessed at Qn, including the first
word written to an empty FIFO, must be requested using REN. When the last
word has been read from the FIFO, the Empty Flag (EF) will go LOW, inhibiting
further read operations. REN is ignored when the FIFO is empty. Once a write
is performed, EF will go HIGH allowing a read to occur. The EF flag is updated
by two RCLK cycles + tSKEW after the valid WCLK cycle.
In the FWFT mode, the first word written to an empty FIFO automatically goes
to the outputs Qn, on the third valid LOW to HIGH transition of RCLK + tSKEW
after the first write. REN does not need to be asserted LOW. In order to access
all other words, a read must be executed using REN. The RCLK LOW to HIGH
transition after the last word has been read from the FIFO, Output Ready (OR)
will go HIGH with a true read (RCLK with REN = LOW), inhibiting further read
operations. REN is ignored when the FIFO is empty.
If Asynchronous operation of the Read port has been selected, then REN
must be held active, (tied LOW).
WRITE STROBE & WRITE CLOCK (WR/WCLK)
If Synchronous operation of the write port has been selected via ASYW, this
input behaves as WCLK.
A write cycle is initiated on the rising edge of the WCLK input. Data setup
and hold times must be met with respect to the LOW-to-HIGH transition of the
WCLK. It is permissible to stop the WCLK. Note that while WCLK is idle, the FF/
IR, PAF and HF flags will not be updated. (Note that WCLK is only capable of
updating HF flag to LOW). The Write and Read Clocks can either be
independent or coincident.
If Asynchronous operation has been selected this input is WR (write strobe).
Data is Asynchronously written into the FIFO via the Dn inputs whenever there
is a rising edge on WR. In this mode the WEN input must be tied LOW.
SERIAL ENABLE (SEN)
The SEN input is an enable used only for serial programming of the offset
registers. The serial programming method must be selected during Master
Reset. SEN is always used in conjunction with LD. When these lines are both
LOW, data at the SI input can be loaded into the program register one bit for each
LOW-to-HIGH transition of WCLK.
When SEN is HIGH, the programmable registers retains the previous
settings and no offsets are loaded. SEN functions the same way in both IDT
Standard and FWFT modes.
WRITE ENABLE (WEN)
When the WEN input is LOW, data may be loaded into the FIFO RAM array
on the rising edge of every WCLK cycle if the device is not full. Data is stored
in the RAM array sequentially and independently of any ongoing read
operation.
When WEN is HIGH, no new data is written in the RAM array on each WCLK
cycle.
To prevent data overflow in the IDT Standard mode, FF will go LOW,
inhibiting further write operations. Upon the completion of a valid read cycle, FF
will go HIGH allowing a write to occur. The FF is updated by two WCLK cycles
+ tSKEW after the RCLK cycle.
To prevent data overflow in the FWFT mode, IR will go HIGH, inhibiting
further write operations. Upon the completion of a valid read cycle, IR will go
LOW allowing a write to occur. The IR flag is updated by two WCLK cycles +
tSKEW after the valid RCLK cycle.
WEN is ignored when the FIFO is full in either FWFT or IDT Standard mode.
If Asynchronous operation of the Read port has been selected, then WEN
must be held active, (tied LOW).
OUTPUT ENABLE (OE)
When Output Enable is enabled (LOW), the parallel output buffers receive
data from the output register. When OE is HIGH, the output data bus (Qn) goes
into a high impedance state.
LOAD (LD)
This is a dual purpose pin. During Master Reset, the state of the LD input,
along with FSEL0 and FSEL1, determines one of eight default offset values for
the PAE and PAF flags, along with the method by which these offset registers
can be programmed, parallel or serial (see Table 2). After Master Reset, LD
enables write operations to and read operations from the offset registers. Only
the offset loading method currently selected can be used to write to the registers.
Offset registers can be read only in parallel.
After Master Reset, the LD pin is used to activate the programming process
of the flag offset values PAE and PAF. Pulling LD LOW will begin a serial loading
or parallel load or read of these offset values.
READ STROBE & READ CLOCK (RD/RCLK)
If Synchronous operation of the read port has been selected via ASYR, this
input behaves as RCLK. A read cycle is initiated on the rising edge of the RCLK
input. Data can be read on the outputs, on the rising edge of the RCLK input.
20
BUS FIFO
IDT72V223/233/243/253/263/273/283/293
3.3V
HIGH DENSITY
SUPERSYNC
IITM NARROW
IDT72V263/273/283/293/103/113
3.3V HIGH
DENSITY
SUPERSYNC
IITM NARROW
BUS FIFO
8K
9/18,2K
32K
x 9/18,
x 9/18,
9/18,x256K
9/18,
512K64K
x9 x 9/18, 128K x 9
512xx18,
18,16K
1K xx 9/18,
x 9/18,
4K64K
x 9/18,
8K 128K
x 9/18,x 16K
9/18, x32K
x 9/18,
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
1,024 for the IDT72V233, 2,048 for the IDT72V243, 4,096 for the IDT72V253,
8,192 for the IDT72V263, 16,384 for the IDT72V273, 32,768 for the IDT72V283
and 65,536 for the IDT72V293. If both x9 Input and x9 Output bus Widths are
selected, D = 1,024 for the IDT72V223, 2,048 for the IDT72V233, 4,096 for the
IDT72V243, 8,192 for the IDT72V253, 16,384 for the IDT72V263, 32,768 for
the IDT72V273, 65,536 for the IDT72V283 and 131,072 for the IDT72V293.
See Figure 7, Write Cycle and Full Flag Timing (IDT Standard Mode), for the
relevant timing information.
In FWFT mode, the Input Ready (IR) function is selected. IR goes LOW
when memory space is available for writing in data. When there is no longer
any free space left, IR goes HIGH, inhibiting further write operations. If no reads
are performed after a reset (either MRS or PRS), IR will go HIGH after D writes
to the FIFO. If x18 Input or x18 Output bus Width is selected, D = 513 for the
IDT72V223, 1,025 for the IDT72V233, 2,049 for the IDT72V243, 4,097 for the
IDT72V253, 8,193 for the IDT72V263, 16,385 for the IDT72V273, 32,769 for
the IDT72V283 and 65,537 for the IDT72V293. If both x9 Input and x9 Output
bus Widths are selected, D = 1,025 for the IDT72V223, 2,049 for the
IDT72V233, 4,097 for the IDT72V243, 8,193 for the IDT72V253, 16,385 for
the IDT72V263, 32,769 for the IDT72V273, 65,537 for the IDT72V283 and
131,073 for the IDT72V293. See Figure 9, Write Timing (FWFT Mode), for
the relevant timing information.
The IR status not only measures the contents of the FIFO memory, but also
counts the presence of a word in the output register. Thus, in FWFT mode, the
total number of writes necessary to deassert IR is one greater than needed to
assert FF in IDT Standard mode.
FF/IR is synchronous and updated on the rising edge of WCLK. FF/IR are
double register-buffered outputs.
BUS-MATCHING (IW, OW)
The pins IW and OW are used to define the input and output bus widths.
During Master Reset, the state of these pins is used to configure the device bus
sizes. See Table 1 for control settings. All flags will operate based on the word/
byte size boundary as defined by the selection of the widest input or output bus
width.
BIG-ENDIAN/LITTLE-ENDIAN (BE)
During Master Reset, a LOW on BE will select Big-Endian operation. A HIGH
on BE during Master Reset will select Little-Endian format. This function is useful
when data is written into the FIFO in word format (x18) and read out of the FIFO
in word format (x18) or byte format (x9). If Big-Endian mode is selected, then
the most significant byte of the word written into the FIFO will be read out of the
FIFO first, followed by the least significant byte. If Little-Endian format is selected,
then the least significant byte of the word written into the FIFO will be read out
first, followed by the most significant byte. The mode desired is configured during
master reset by the state of the Big-Endian (BE) pin. Refer to Figure 4, BusMatching Byte Arrangement, for a diagram showing the byte arrangement.
PROGRAMMABLE FLAG MODE (PFM)
During Master Reset During Master Reset, a LOW on PFM will select
Asynchronous Programmable flag timing mode. A HIGH on PFM will select
Synchronous Programmable flag timing mode. If asynchronous PAF/PAE
configuration is selected (PFM, LOW during MRS), the PAE is asserted LOW
on the LOW-to-HIGH transition of RCLK. PAE is reset to HIGH on the LOW-toHIGH transition of WCLK. Similarly, the PAF is asserted LOW on the LOW-toHIGH transition of WCLK and PAF is reset to HIGH on the LOW-to-HIGH
transition of RCLK.
If synchronous PAE/PAF configuration is selected (PFM, HIGH during
MRS) , the PAE is asserted and updated on the rising edge of RCLK only and
not WCLK. Similarly, PAF is asserted and updated on the rising edge of WCLK
only and not RCLK. The mode desired is configured during master reset by the
state of the Programmable Flag Mode (PFM) pin.
EMPTY FLAG (EF/OR)
This is a dual purpose pin. In the IDT Standard mode, the Empty Flag (EF)
function is selected. When the FIFO is empty, EF will go LOW, inhibiting further
read operations. When EF is HIGH, the FIFO is not empty. See Figure 8, Read
Cycle, Empty Flag and First Word Latency Timing (IDT Standard Mode), for
the relevant timing information.
In FWFT mode, the Output Ready (OR) function is selected. OR goes LOW
at the same time that the first word written to an empty FIFO appears valid on
the outputs. OR stays LOW after the RCLK LOW to HIGH transition that shifts the
last word from the FIFO memory to the outputs. OR goes HIGH only with a true
read (RCLK with REN = LOW). The previous data stays at the outputs, indicating
the last word was read. Further data reads are inhibited until OR goes LOW
again. See Figure 10, Read Timing (FWFT Mode), for the relevant timing
information.
EF/OR is synchronous and updated on the rising edge of RCLK.
In IDT Standard mode, EF is a double register-buffered output. In FWFT
mode, OR is a triple register-buffered output.
INTERSPERSED PARITY (IP)
During Master Reset, a LOW on IP will select Non-Interspersed Parity mode.
A HIGH will select Interspersed Parity mode. The IP bit function allows the user
to select the parity bit in the word loaded into the parallel port (D0-Dn) when
programming the flag offsets. If Interspersed Parity mode is selected, then the
FIFO will assume that the parity bit is located in bit position D8 and D17 during
the parallel programming of the flag offsets, and will therefore ignore D8 when
loading the offset register in parallel mode. This is also applied to the output
register when reading the value of the offset register. If Interspersed Parity is
selected then output Q8 will be invalid. If Non-Interspersed Parity mode is
selected, then D16 and D17 are the parity bits and are ignored during parallel
programming of the offsets. (D8 becomes a valid bit). Additionally, output Q8 will
become a valid bit when performing a read of the offset register. IP mode is
selected during Master Reset by the state of the IP input pin. Interspersed Parity
control only has an effect during parallel programming of the offset registers. It
does not effect the data written to and read from the FIFO.
PROGRAMMABLE ALMOST-FULL FLAG (PAF)
The Programmable Almost-Full flag (PAF) will go LOW when the FIFO
reaches the almost-full condition. In IDT Standard mode, if no reads are
performed after reset (MRS), PAF will go LOW after (D-m) words are written
to the FIFO. If x18 Input or x18 Output bus Width is selected, (D-m) = (512-m)
writes for the IDT72V223, (1,024-m) writes for the IDT72V233, (2,048-m)
writes for the IDT72V243, (4,096-m) writes for the IDT72V253, (8,192-m)
writes for the IDT72V263, (16,384-m) writes for the IDT72V273, (32,768-m)
writes for the IDT72V283 and (65,536-m) writes for the IDT72V293. If both x9
Input and x9 Output bus Widths are selected, (D-m) = (1,024-m) writes for the
IDT72V223, (2,048-m) writes for the IDT72V233, (4,096-m) writes for the
IDT72V243, (8,192-m) writes for the IDT72V253, (16,384-m) writes for the
OUTPUTS:
FULL FLAG (FF/IR)
This is a dual purpose pin. In IDT Standard mode, the Full Flag (FF) function
is selected. When the FIFO is full, FF will go LOW, inhibiting further write
operations. When FF is HIGH, the FIFO is not full. If no reads are performed
after a reset (either MRS or PRS), FF will go LOW after D writes to the FIFO.
If x18 Input or x18 Output bus Width is selected, D = 512 for the IDT72V223,
21
IDT72V223/233/243/253/263/273/283/293 3.3V HIGH DENSITY SUPERSYNC IITM NARROW BUS FIFO
512 x 18, 1K x 9/18, 2K x 9/18, 4K x 9/18, 8K x 9/18, 16K x 9/18, 32K x 9/18, 64K x 9/18, 128K x 9
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
configuration is selected, the PAE is updated on the rising edge of RCLK. See
Figure 21, Asynchronous Programmable Almost-Empty Flag Timing (IDT
Standard and FWFT Mode), for the relevant timing information.
IDT72V263, (32,768-m) writes for the IDT72V273, (65,536-m) writes for the
IDT72V283 and (131,072-m) writes for the IDT72V293. The offset “m” is the
full offset value. The default setting for this value is stated in Table 2.
In FWFT mode, if x18 Input or x18 Output bus Width is selected, the PAF
will go LOW after (513-m) writes for the IDT72V223, (1,025-m) writes for the
IDT72V233, (2,049-m) writes for the IDT72V243, (4,097-m) writes for the
IDT72V253, (8,193-m) writes for the IDT72V263, (16,385-m) writes for the
IDT72V273, (32,769-m) writes for the IDT72V283 and (65,537-m) writes for
the IDT72V293. If both x9 Input and x9 Output bus Widths are selected, the PAF
will go LOW after (1,025-m) writes for the IDT72V223, (2,049-m) writes for the
IDT72V233, (4,097-m) writes for the IDT72V243, (8,193-m) writes for the
IDT72V253, (16,385-m) writes for the IDT72V263, (32,769-m) writes for the
IDT72V273, (65,537-m) writes for the IDT72V283 and (131,073-m) writes for
the IDT72V293. The offset m is the full offset value. The default setting for this
value is stated in Table 2.
See Figure 18, Synchronous Programmable Almost-Full Flag Timing (IDT
Standard and FWFT Mode), for the relevant timing information.
If asynchronous PAF configuration is selected, the PAF is asserted LOW
on the LOW-to-HIGH transition of the Write Clock (WCLK). PAF is reset to HIGH
on the LOW-to-HIGH transition of the Read Clock (RCLK). If synchronous PAF
configuration is selected, the PAF is updated on the rising edge of WCLK. See
Figure 20 for Asynchronous Programmable Almost-Full Flag Timing (IDT
Standard and FWFT Mode).
HALF-FULL FLAG (HF)
This output indicates a half-full FIFO. The rising WCLK edge that fills the FIFO
beyond half-full sets HF LOW. The flag remains LOW until the difference between
the write and read pointers becomes less than or equal to half of the total depth
of the device; the rising RCLK edge that accomplishes this condition sets HF
HIGH.
In IDT Standard mode, if no reads are performed after reset (MRS or PRS),
HF will go LOW after (D/2 + 1) writes to the FIFO. If x18 Input or x18 Output
bus Width is selected, D = 512 for the IDT72V223, 1,024 for the IDT72V233,
2,048 for the IDT72V243, 4,096 for the IDT72V253, 8,192 for the IDT72V263,
16,384 for the IDT72V273, 32,768 for the IDT72V283 and 65,536 for the
IDT72V293. If both x9 Input and x9 Output bus Widths are selected, D = 1,024
for the IDT72V223, 2,048 for the IDT72V233, 4,096 for the IDT72V243, 8,192
for the IDT72V253, 16,384 for the IDT72V263, 32,768 for the IDT72V273,
65,536 for the IDT72V283 and 131,072 for the IDT72V293.
In FWFT mode, if no reads are performed after reset (MRS or PRS), HF
will go LOW after (D-1/2 + 2) writes to the FIFO. If x18 Input or x18 Output bus
Width is selected, D = 513 for the IDT72V223, 1,025 for the IDT72V233, 2,049
for the IDT72V243, 4,097 for the IDT72V253, 8,193 for the IDT72V263, 16,385
for the IDT72V273, 32,769 for the IDT72V283 and 65,537 for the IDT72V293.
If both x9 Input and x9 Output bus Widths are selected, D = 1,025 for the
IDT72V223, 2,049 for the IDT72V233, 4,097 for the IDT72V243, 8,193 for the
IDT72V253, 16,385 for the IDT72V263, 32,769 for the IDT72V273, 65,537 for
the IDT72V283 and 131,073 for the IDT72V293.
See Figure 22, Half-Full Flag Timing (IDT Standard and FWFT Mode),
for the relevant timing information. Because HF is updated by both RCLK and
WCLK, it is considered asynchronous.
PROGRAMMABLE ALMOST-EMPTY FLAG (PAE)
The Programmable Almost-Empty flag (PAE) will go LOW when the FIFO
reaches the almost-empty condition. In IDT Standard mode, PAE will go LOW
when there are n words or less in the FIFO. The offset “n” is the empty offset
value. The default setting for this value is stated in Table 2.
In FWFT mode, the PAE will go LOW when there are n+1 words or less
in the FIFO. The default setting for this value is stated in Table 2.
See Figure 19, Synchronous Programmable Almost-Empty Flag Timing
(IDT Standard and FWFT Mode), for the relevant timing information.
If asynchronous PAE configuration is selected, the PAE is asserted LOW
on the LOW-to-HIGH transition of the Read Clock (RCLK). PAE is reset to HIGH
on the LOW-to-HIGH transition of the Write Clock (WCLK). If synchronous PAE
DATA OUTPUTS (Q0-Qn)
(Q0 - Q17) data outputs for 18-bit wide data or (Q0 - Q8) data outputs for 9bit wide data.
22
BUS FIFO
IDT72V223/233/243/253/263/273/283/293
3.3V
HIGH DENSITY
SUPERSYNC
IITM NARROW
IDT72V263/273/283/293/103/113
3.3V HIGH
DENSITY
SUPERSYNC
IITM NARROW
BUS FIFO
8K
9/18,2K
32K
x 9/18,
x 9/18,
9/18,x256K
9/18,
512K64K
x9 x 9/18, 128K x 9
512xx18,
18,16K
1K xx 9/18,
x 9/18,
4K64K
x 9/18,
8K 128K
x 9/18,x 16K
9/18, x32K
x 9/18,
BYTE ORDER ON INPUT PORT:
BYTE ORDER ON OUTPUT PORT:
BE
IW
OW
L
L
L
BE
IW
OW
H
L
L
D17-D9
D8-D0
A
B
Q17-Q9
Q8-Q0
A
B
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
Write to FIFO
Read from FIFO
(a) x18 INPUT to x18 OUTPUT - BIG ENDIAN
Q17-Q9
Q8-Q0
B
A
Read from FIFO
(b) x18 INPUT to x18 OUTPUT - LITTLE ENDIAN
Q17-Q9
BE
IW
OW
L
L
H
Q8-Q0
A
Q17-Q9
1st: Read from FIFO
Q8-Q0
B
2nd: Read from FIFO
(c) x18 INPUT to x9 OUTPUT - BIG ENDIAN
Q17-Q9
BE
IW
OW
H
L
H
Q8-Q0
B
Q17-Q9
1st: Read from FIFO
Q8-Q0
A
2nd: Read from FIFO
(d) x18 INPUT to x9 OUTPUT - LITTLE ENDIAN
BYTE ORDER ON INPUT PORT:
D17-D9
D8-D0
A
D17-Q9
D8-Q0
B
BYTE ORDER ON OUTPUT PORT:
BE
IW
OW
L
H
L
1st: Write to FIFO
Q17-Q9
Q8-Q0
A
B
2nd: Write to FIFO
Read from FIFO
(a) x9 INPUT to x18 OUTPUT - BIG ENDIAN
BE
IW
OW
H
H
L
Q17-Q9
Q8-Q0
B
A
Read from FIFO
(a) x9 INPUT to x18 OUTPUT - LITTLE ENDIAN
4666 drw07
Figure 4. Bus-Matching Byte Arrangement
23
IDT72V223/233/243/253/263/273/283/293 3.3V HIGH DENSITY SUPERSYNC IITM NARROW BUS FIFO
512 x 18, 1K x 9/18, 2K x 9/18, 4K x 9/18, 8K x 9/18, 16K x 9/18, 32K x 9/18, 64K x 9/18, 128K x 9
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
tRS
MRS
tRSS
tRSR
tRSS
tRSR
tRSS
tRSR
tRSS
tRSR
REN
WEN
FWFT/SI
LD
tRSS
ASYW,
ASYR
tRSS
FSEL0,
FSEL1
tRSS
OW, IW
tRSS
BE
tRSS
RM
tRSS
PFM
tRSS
IP
tRSS
RT
tRSS
SEN
If FWFT = HIGH, OR = HIGH
tRSF
EF/OR
If FWFT = LOW, EF = LOW
tRSF
If FWFT = LOW, FF = HIGH
FF/IR
If FWFT = HIGH, IR = LOW
tRSF
PAE
tRSF
PAF, HF
tRSF
OE = HIGH
Q0 - Qn
OE = LOW
Figure 5. Master Reset Timing
24
4666 drw 08
BUS FIFO
IDT72V223/233/243/253/263/273/283/293
3.3V
HIGH DENSITY
SUPERSYNC
IITM NARROW
IDT72V263/273/283/293/103/113
3.3V HIGH
DENSITY
SUPERSYNC
IITM NARROW
BUS FIFO
8K
9/18,2K
32K
x 9/18,
x 9/18,
9/18,x256K
9/18,
512K64K
x9 x 9/18, 128K x 9
512xx18,
18,16K
1K xx 9/18,
x 9/18,
4K64K
x 9/18,
8K 128K
x 9/18,x 16K
9/18, x32K
x 9/18,
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
tRS
PRS
tRSS
tRSR
REN
tRSS
tRSR
WEN
tRSS
RT
tRSS
SEN
If FWFT = HIGH, OR = HIGH
tRSF
EF/OR
If FWFT = LOW, EF = LOW
If FWFT = LOW, FF = HIGH
tRSF
FF/IR
If FWFT = HIGH, IR = LOW
tRSF
PAE
tRSF
PAF, HF
tRSF
OE = HIGH
Q0 - Qn
OE = LOW
Figure 6. Partial Reset Timing
25
4666 drw09
IDT72V223/233/243/253/263/273/283/293 3.3V HIGH DENSITY SUPERSYNC IITM NARROW BUS FIFO
512 x 18, 1K x 9/18, 2K x 9/18, 4K x 9/18, 8K x 9/18, 16K x 9/18, 32K x 9/18, 64K x 9/18, 128K x 9
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
tCLK
tCLKH
NO WRITE
WCLK
tCLKL
NO WRITE
2
1
1
tSKEW1(1)
tDS
D0 - Dn
tDH
2
tSKEW1(1)
tDH
tDS
DX
DX+1
tWFF
tWFF
tWFF
tWFF
FF
WEN
RCLK
tENS
tENS
tENH
tENH
REN
tA
tA
Q0 - Qn
DATA IN OUTPUT REGISTER
NEXT DATA READ
DATA READ
4666 drw10
NOTES:
1. tSKEW1 is the minimum time between a rising RCLK edge and a rising WCLK edge to guarantee that FF will go high (after one WCLK cycle pus tWFF). If the time between the rising edge
of the RCLK and the rising edge of the WCLK is less than tSKEW1, then the FF deassertion may be delayed one extra WCLK cycle.
2. LD = HIGH, EF = HIGH
Figure 7. Write Cycle and Full Flag Timing (IDT Standard Mode)
tCLK
tCLKH
RCLK
1
tENS
tCLKL
2
tENS
tENH
REN
tENH
tENS
tENH
NO OPERATION
NO OPERATION
tREF
tREF
tREF
EF
tA
tA
Q0 - Qn
LAST WORD
tOLZ
LAST WORD
D1
tOLZ
tOHZ
tOE
tA
D0
OE
tSKEW1(1)
WCLK
tENS
tENH
tENS
tDHS
tDS
tENH
WEN
tDS
D0 - Dn
D0
tDH
D1
4666 drw11
NOTES:
1. tSKEW1 is the minimum time between a rising WCLK edge and a rising RCLK edge to guarantee that EF will go HIGH (after one RCLK cycle plus tREF). If the time between the rising edge
of WCLK and the rising edge of RCLK is less than tSKEW1, then EF deassertion may be delayed one extra RCLK cycle.
2. LD = HIGH.
3. First data word latency: tSKEW1 + 1*TRCLK + tREF.
Figure 8. Read Cycle, Empty Flag and First Data Word Latency Timing (IDT Standard Mode)
26
27
tDS
tENS
W1
W2
2
DATA IN OUTPUT REGISTER
1
tSKEW1(1)
tDH
W3
3
tREF
tA
W4
tDS
W1
W[n +2]
W[n+3]
1
tSKEW2 (2)
2
tPAES
W[n+4]
W[
D-1
]
tDS
W[
D-1
]
tHF
W[
D-1
]
W[D-m-2]
tDS
W[D-m-1]
W[D-m]
1
W[D-m+1]
2
tPAFS
W[D-m+2]
W[D-1]
WD
4666 drw12
tWFF
tENH
Figure 9. Write Timing and First Data Word Latency Timing (First Word Fall Through Mode)
NOTES:
1. tSKEW1 is the minimum time between a rising WCLK edge and a rising RCLK edge to guarantee that OR will go LOW after two RCLK cycles plus tREF. If the time between the rising edge of WCLK and the rising edge of RCLK is less than
tSKEW1, then OR assertion may be delayed one extra RCLK cycle.
2. tSKEW2 is the minimum time between a rising WCLK edge and a rising RCLK edge to guarantee that PAE will go HIGH after one RCLK cycle plus tPAES. If the time between the rising edge of WCLK and the rising edge of RCLK is less than
tSKEW2, then the PAE deassertion may be delayed one extra RCLK cycle.
3. LD = HIGH, OE = LOW
4. n = PAE offset, m = PAF offset and D = maximum FIFO depth.
5. If x18 Input or x18 Output bus Width is selected, D = 513 for the IDT72V223, 1,025 for the IDT72V233, 2,049 for the IDT72V243, 4,097 for the IDT72V253, 8,193 for the IDT72V263, 16,385 for the IDT72V273, 32,769 for the IDT72V283
and 65,537 for the IDT72V293.
If both x9 Input and x9 Output bus Widths are selected, D = 1,025 for the IDT72V223, 2,049 for the IDT72V233, 4,097 for the IDT72V243, 8,193 for the IDT72V253, 16,385 for the IDT72V263, 32,769 for the IDT72V273, 65,537
for the IDT72V283 and 131,073 for the IDT72V293.
6. First data word latency: tSKEW1 + 2*TRCLK + tREF.
IR
PAF
HF
PAE
OR
Q0 - Q17
REN
RCLK
D0 - D17
WEN
WCLK
BUS FIFO
IDT72V223/233/243/253/263/273/283/293
3.3V
HIGH DENSITY
SUPERSYNC
IITM NARROW
IDT72V263/273/283/293/103/113
3.3V HIGH
DENSITY
SUPERSYNC
IITM NARROW
BUS FIFO
8K
9/18,2K
32K
x 9/18,
x 9/18,
9/18,x256K
9/18,
512K64K
x9 x 9/18, 128K x 9
512xx18,
18,16K
1K xx 9/18,
x 9/18,
4K64K
x 9/18,
8K 128K
x 9/18,x 16K
9/18, x32K
x 9/18,
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
28
tDS
tENS
W1
tOHZ
WD
tENS
tWFF
tDH
tENH
W1
tOE
tA
W2
1
(1)
tSKEW1
tA
2
tWFF
W3
(2)
Wm+2
tSKEW2
W[m+3]
tA
tPAFS
W[m+4]
W[ D-1
]
tHF
W[ D-1
tA
]
W[D-n-1]
tA
W[D-n]
1
W[D-n+1]
2
tPAES
W[D-n+2]
W[D-1]
tA
tENS
WD
4666 drw13
tREF
Figure 10. Read Timing (First Word Fall Through Mode)
NOTES:
1. tSKEW1 is the minimum time between a rising RCLK edge and a rising WCLK edge to guarantee that IR will go LOW after one WCLK cycle plus tWFF. If the time between the rising edge of RCLK and the rising edge of WCLK is less
than tSKEW1, then the IR assertion may be delayed one extra WCLK cycle.
2. tSKEW2 is the minimum time between a rising RCLK edge and a rising WCLK edge to guarantee that PAF will go HIGH after one WCLK cycle plus tPAFS. If the time between the rising edge of RCLK and the rising edge of WCLK is
less than tSKEW2, then the PAF deassertion may be delayed one extra WCLK cycle.
3. LD = HIGH
4. n = PAE Offset, m = PAF offset and D = maximum FIFO depth.
5. If x18 Input or x18 Output bus Width is selected, D = 513 for the IDT72V223, 1,025 for the IDT72V233, 2,049 for the IDT72V243, 4,097 for the IDT72V253, 8,193 for the IDT72V263, 16,385 for the IDT72V273, 32,769 for the IDT72V283
and 65,537 for the IDT72V293.
If both x9 Input and x9 Output bus Widths are selected, D = 1,025 for the IDT72V223, 2,049 for the IDT72V233, 4,097 for the IDT72V243, 8,193 for the IDT72V253, 16,385 for the IDT72V263, 32,769 for the IDT72V273, 65,537
for the IDT72V283 and 131,073 for the IDT72V293.
IR
PAF
HF
PAE
OR
Q0 - Q17
OE
REN
RCLK
D0 - D17
WEN
WCLK
IDT72V223/233/243/253/263/273/283/293 3.3V HIGH DENSITY SUPERSYNC IITM NARROW BUS FIFO
512 x 18, 1K x 9/18, 2K x 9/18, 4K x 9/18, 8K x 9/18, 16K x 9/18, 32K x 9/18, 64K x 9/18, 128K x 9
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
BUS FIFO
IDT72V223/233/243/253/263/273/283/293
3.3V
HIGH DENSITY
SUPERSYNC
IITM NARROW
IDT72V263/273/283/293/103/113
3.3V HIGH
DENSITY
SUPERSYNC
IITM NARROW
BUS FIFO
8K
9/18,2K
32K
x 9/18,
x 9/18,
9/18,x256K
9/18,
512K64K
x9 x 9/18, 128K x 9
512xx18,
18,16K
1K xx 9/18,
x 9/18,
4K64K
x 9/18,
8K 128K
x 9/18,x 16K
9/18, x32K
x 9/18,
1
RCLK
tENS
tENH
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
2
tENS
tRTS
tENH
REN
tA
Q0 - Qn
tA
Wx
tA
W1(3)
Wx+1
W2(3)
tSKEW2
1
WCLK
2
tRTS
WEN
tENS
tENH
RT
tREF
tREF
EF
tPAES
PAE
tHF
HF
tPAFS
PAF
4666 drw14
NOTES:
1. Retransmit setup is complete after EF returns HIGH, only then can a read operation begin.
2. OE = LOW.
3. W1 = first word written to the FIFO after Master Reset, W2 = second word written to the FIFO after Master Reset.
4. No more than D - 2 may be written to the FIFO between Reset (Master or Partial) and Retransmit setup. Therefore, FF will be HIGH throughout the Retransmit setup procedure.
If x18 Input or x18 Output bus Width is selected, D = 512 for the IDT72V223, 1,024 for the IDT72V233, 2,048 for the IDT72V243, 4,096 for the IDT72V253, 8,192 for the IDT72V263,
16,384 for the IDT72V273, 32,768 for the IDT72V283 and 65,536 for the IDT72V293.
If both x9 Input and x9 Output bus Widths are selected, D = 1,024 for the IDT72V223, 2,048 for the IDT72V233, 4,096 for the IDT72V243, 8,192 for the IDT72V253, 16,384
for the IDT72V263, 32,768 for the IDT72V273, 65,536 for the IDT72V283 and 131,072 for the IDT72V293.
5. There must be at least two words written to and two words read from the FIFO before a Retransmit operation can be invoked.
6. RM is set HIGH during MRS.
Figure 11. Retransmit Timing (IDT Standard Mode)
29
IDT72V223/233/243/253/263/273/283/293 3.3V HIGH DENSITY SUPERSYNC IITM NARROW BUS FIFO
512 x 18, 1K x 9/18, 2K x 9/18, 4K x 9/18, 8K x 9/18, 16K x 9/18, 32K x 9/18, 64K x 9/18, 128K x 9
tENH
tENS
3
2
1
RCLK
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
4
tENH
tENS
tRTS
REN
tA
Q0 - Qn
tA
Wx
tA
(4)
Wx+1
W1
W2
(4)
tA
W3(4)
W4
tSKEW2
1
WCLK
2
tRTS
WEN
tENS
tENH
RT
tREF
tREF
OR
tPAES
PAE
tHF
HF
tPAFS
PAF
4666 drw15
NOTES:
1. Retransmit setup is complete after OR returns LOW.
2. No more than D - 2 words may be written to the FIFO between Reset (Master or Partial) and Retransmit setup. Therefore, IR will be LOW throughout the Retransmit setup procedure.
If x18 Input or x18 Output bus Width is selected, D = 513 for the IDT72V223, 1,025 for the IDT72V233, 2,049 for the IDT72V243, 4,097 for the IDT72V253, 8,193 for the IDT72V263,
16,385 for the IDT72V273, 32,769 for the IDT72V283 and 65,537 for the IDT72V293.
If both x9 Input and x9 Output bus Widths are selected, D = 1,025 for the IDT72V223, 2,049 for the IDT72V233, 4,097 for the IDT72V243, 8,193 for the IDT72V253, 16,385
for the IDT72V263, 32,769 for the IDT72V273, 65,537 for the IDT72V283 and 131,073 for the IDT72V293.
3. OE = LOW
4. W1, W2, W3 = first, second and third words written to the FIFO after Master Reset.
5. There must be at least two words written to the FIFO before a Retransmit operation can be invoked.
6. RM is set HIGH during MRS.
Figure 12. Retransmit Timing (FWFT Mode)
30
BUS FIFO
IDT72V223/233/243/253/263/273/283/293
3.3V
HIGH DENSITY
SUPERSYNC
IITM NARROW
IDT72V263/273/283/293/103/113
3.3V HIGH
DENSITY
SUPERSYNC
IITM NARROW
BUS FIFO
8K
9/18,2K
32K
x 9/18,
x 9/18,
9/18,x256K
9/18,
512K64K
x9 x 9/18, 128K x 9
512xx18,
18,16K
1K xx 9/18,
x 9/18,
4K64K
x 9/18,
8K 128K
x 9/18,x 16K
9/18, x32K
x 9/18,
RCLK
2
1
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
3
tENH
tENS
REN
Q0 - Qn
tA
tA
tA
Wx
W1(3)
Wx+1
tA
W2(3)
tA
W3(3)
W4
tSKEW2
1
WCLK
2
tRTS
WEN
tENS
tENH
RT
EF(1)
tPAES
PAE
tHF
HF
tPAFS
PAF
4666 drw16
NOTES:
1. If the part is empty at the point of Retransmit, the Empty Flag (EF) will be updated based on RCLK (Retransmit clock cycle). Valid data will also appear on the output.
2. OE = LOW: enables data to be read on outputs Q0-Qn.
3. W1 = first word written to the FIFO after Master Reset, W2 = second word written to the FIFO after Master Reset.
4. No more than D - 2 may be written to the FIFO between Reset (Master or Partial) and Retransmit setup. Therefore, FF will be HIGH throughout the Retransmit setup procedure.
If x18 Input or x18 Output bus Width is selected, D = 512 for the IDT72V223, 1,024 for the IDT72V233, 2,048 for the IDT72V243, 4,096 for the IDT72V253, 8,192 for the IDT72V263,
16,384 for the IDT72V273, 32,768 for the IDT72V283 and 65,536 for the IDT72V293.
If both x9 Input and x9 Output bus Widths are selected, D = 1,024 for the IDT72V223, 2,048 for the IDT72V233, 4,096 for the IDT72V243, 8,192 for the IDT72V253, 16,384
for the IDT72V263, 32,768 for the IDT72V273, 65,536 for the IDT72V283 and 131,072 for the IDT72V293.
5. There must be at least two words written to and read from the FIFO before a Retransmit operation can be invoked.
6. RM is set LOW during MRS.
Figure 13. Zero Latency Retransmit Timing (IDT Standard Mode)
31
IDT72V223/233/243/253/263/273/283/293 3.3V HIGH DENSITY SUPERSYNC IITM NARROW BUS FIFO
512 x 18, 1K x 9/18, 2K x 9/18, 4K x 9/18, 8K x 9/18, 16K x 9/18, 32K x 9/18, 64K x 9/18, 128K x 9
RCLK
2
1
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
4
3
5
tENH
tENS
REN
tA
Q0 - Qn
Wx
tA
Wx+1
tA
tA
W1
W2
(3)
W3
tA
(3)
W4
(3)
W5
tSKEW2
1
WCLK
2
tRTS
WEN
tENS
tENH
RT
OR
tPAES
PAE
tHF
HF
tPAFS
PAF
4666 drw17
NOTES:
1. If the part is empty at the point of Retransmit, the output ready flag (OR), will be updated based on RCLK (Retransmit clock cycle), valid data will also appear on the output.
2. No more than D - 2 words may be written to the FIFO between Reset (Master or Partial) and Retransmit setup. Therefore, IR will be LOW throughout the Retransmit setup procedure.
If x18 Input or x18 Output bus Width is selected, D = 513 for the IDT72V223, 1,025 for the IDT72V233, 2,049 for the IDT72V243, 4,097 for the IDT72V253, 8,193 for the IDT72V263,
16,385 for the IDT72V273, 32,769 for the IDT72V283 and 65,537 for the IDT72V293.
If both x9 Input and x9 Output bus Widths are selected, D = 1,025 for the IDT72V223, 2,049 for the IDT72V233, 4,097 for the IDT72V243, 8,193 for the IDT72V253, 16,385
for the IDT72V263, 32,769 for the IDT72V273, 65,537 for the IDT72V283 and 131,073 for the IDT72V293.
3. OE = LOW
4. W1, W2, W3 = first, second and third words written to the FIFO after Master Reset.
5. There must be at least two words written to the FIFO before a Retransmit operation can be invoked.
6. RM is set LOW during MRS.
Figure 14. Zero Latency Retransmit Timing (FWFT Mode)
WCLK
tENS
tENH
tENH
SEN
tLDS
tLDH
tLDH
LD
tDS
SI
tDH
BIT X(1)
BIT 0
BIT X(1)
BIT 0
FULL OFFSET
EMPTY OFFSET
4666 drw18
NOTES:
1. x9 to x9 mode: X = 9 for the IDT72V223, X = 10 for the IDT72V233, X = 11 for the IDT72V243, X = 12 for the IDT72V253, X = 13 for the IDT72V263, X = 14 for the IDT72V273,
X = 15 for the IDT72V283 and X = 16 for the IDT72V293.
2. All other modes: X = 8 for the IDT72V223, X = 9 for the IDT72V233, X = 10 for the IDT72V243, X = 11 for the IDT72V253, X = 12 for the IDT72V263, X = 13 for the IDT72V273,
X = 14 for the IDT72V283 and X = 15 for the IDT72V293.
Figure 15. Serial Loading of Programmable Flag Registers (IDT Standard and FWFT Modes)
32
BUS FIFO
IDT72V223/233/243/253/263/273/283/293
3.3V
HIGH DENSITY
SUPERSYNC
IITM NARROW
IDT72V263/273/283/293/103/113
3.3V HIGH
DENSITY
SUPERSYNC
IITM NARROW
BUS FIFO
8K
9/18,2K
32K
x 9/18,
x 9/18,
9/18,x256K
9/18,
512K64K
x9 x 9/18, 128K x 9
512xx18,
18,16K
1K xx 9/18,
x 9/18,
4K64K
x 9/18,
8K 128K
x 9/18,x 16K
9/18, x32K
x 9/18,
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
tCLK
tCLKH
tCLKL
WCLK
tLDS
tLDH
tLDH
tENS
tENH
tENH
tDS
tDH
LD
WEN
tDS
tDS
tDH
tDS
tDH
tDH
D0 - D16
PAE OFFSET (LSB)
PAE OFFSET (MSB)
PAF OFFSET (LSB)
PAF OFFSET (MSB)
4666 drw19
NOTE:
1. This diagram is based on programming the IDT72V293 x18 bus width. Add one extra cycle to both the PAE offset and PAF offset for x9 bus width.
Figure 16. Parallel Loading of Programmable Flag Registers (IDT Standard and FWFT Modes)
tCLK
tCLKH
tCLKL
RCLK
tLDS
tLDH
tLDH
tENS
tENH
tENH
LD
REN
tA
Q0 - Q16
tA
tA
tA
PAE OFFSET
(LSB)
DATA IN OUTPUT
REGISTER
PAF OFFSET
(LSB)
PAE OFFSET
(MSB)
PAF OFFSET
(MSB)
NOTES:
1. OE = LOW.
2. This diagram is based on programming the IDT72V293 x18 bus width. Add one extra cycle to both the PAE offset and PAF offset for x9 bus width.
4666 drw20
Figure 17. Parallel Read of Programmable Flag Registers (IDT Standard and FWFT Modes)
tCLKH
tCLKL
WCLK
1
tENS
1
2
2
tENH
WEN
tPAFS
PAF
tPAFS
(2)
(2)
D-(m+1) words in FIFO
D - m words in FIFO
tSKEW2(3)
D-(m+1) words
in FIFO(2)
RCLK
tENS
tENH
REN
4666 drw21
NOTES:
1. m = PAF offset .
2. D = maximum FIFO depth.
In IDT Standard mode: if x18 Input or x18 Output bus Width is selected, D = 512 for the IDT72V223, 1,024 for the IDT72V233, 2,048 for the IDT72V243, 4,096 for the IDT72V253,
8,192 for the IDT72V263, 16,384 for the IDT72V273, 32,768 for the IDT72V283 and 65,536 for the IDT72V293. If both x9 Input and x9 Output bus Widths are selected, D = 1,024
for the IDT72V223, 2,048 for the IDT72V233, 4,096 for the IDT72V243, 8,192 for the IDT72V253, 16,384 for the IDT72V263, 32,768 for the IDT72V273, 65,536 for the IDT72V283
and 131,072 for the IDT72V293.
In FWFT mode: if x18 Input or x18 Output bus Width is selected, D = 513 for the IDT72V223, 1,025 for the IDT72V233, 2,049 for the IDT72V243, 4,097 for the IDT72V253, 8,193
for the IDT72V263, 16,385 for the IDT72V273, 32,769 for the IDT72V283 and 65,537 for the IDT72V293. If both x9 Input and x9 Output bus Widths are selected, D = 1,025 for the
IDT72V223, 2,049 for the IDT72V233, 4,097 for the IDT72V243, 8,193 for the IDT72V253, 16,385 for the IDT72V263, 32,769 for the IDT72V273, 65,537 for the IDT72V283 and 131,073
for the IDT72V293.
3. tSKEW2 is the minimum time between a rising RCLK edge and a rising WCLK edge to guarantee that PAF will go HIGH (after one WCLK cycle plus tPAFS). If the time between the
rising edge of RCLK and the rising edge of WCLK is less than tSKEW2, then the PAF deassertion time may be delayed one extra WCLK cycle.
4. PAF is asserted and updated on the rising edge of WCLK only.
5. Select this mode by setting PFM HIGH during Master Reset.
Figure 18. Synchronous Programmable Almost-Full Flag Timing (IDT Standard and FWFT Modes)
33
IDT72V223/233/243/253/263/273/283/293 3.3V HIGH DENSITY SUPERSYNC IITM NARROW BUS FIFO
512 x 18, 1K x 9/18, 2K x 9/18, 4K x 9/18, 8K x 9/18, 16K x 9/18, 32K x 9/18, 64K x 9/18, 128K x 9
tCLKH
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
tCLKL
WCLK
tENS
tENH
WEN
PAE
n words in FIFO (2),
n+1 words in FIFO (3)
tSKEW2(4)
RCLK
tPAES
1
n words in FIFO (2),
n+1 words in FIFO(3)
n+1 words in FIFO (2),
n+2 words in FIFO (3)
2
tPAES
1
2
tENH
tENS
REN
4666 drw22
NOTES:
1. n = PAE offset.
2. For IDT Standard mode
3. For FWFT mode.
4. tSKEW2 is the minimum time between a rising WCLK edge and a rising RCLK edge to guarantee that PAE will go HIGH (after one RCLK cycle plus tPAES). If the time between the rising
edge of WCLK and the rising edge of RCLK is less than tSKEW2, then the PAE deassertion may be delayed one extra RCLK cycle.
5. PAE is asserted and updated on the rising edge of WCLK only.
6. Select this mode by setting PFM HIGH during Master Reset.
Figure 19. Synchronous Programmable Almost-Empty Flag Timing (IDT Standard and FWFT Modes)
tCLKH
tCLKL
WCLK
tENS
tENH
WEN
tPAFA
PAF
D  m words
in FIFO
D  (m + 1) words in FIFO
D  (m + 1)
words in FIFO
tPAFA
RCLK
tENS
REN
4666 drw23
NOTES:
1. m = PAF offset.
2. D = maximum FIFO Depth.
In IDT Standard mode: if x18 Input or x18 Output bus Width is selected, D = 512 for the IDT72V223, 1,024 for the IDT72V233, 2,048 for the IDT72V243, 4,096 for the IDT72V253,
8,192 for the IDT72V263, 16,384 for the IDT72V273, 32,768 for the IDT72V283 and 65,536 for the IDT72V293. If both x9 Input and x9 Output bus Widths are selected, D = 1,024
for the IDT72V223, 2,048 for the IDT72V233, 4,096 for the IDT72V243, 8,192 for the IDT72V253, 16,384 for the IDT72V263, 32,768 for the IDT72V273, 65,536 for the IDT72V283
and 131,072 for the IDT72V293.
In FWFT mode: if x18 Input or x18 Output bus Width is selected, D = 513 for the IDT72V223, 1,025 for the IDT72V233, 2,049 for the IDT72V243, 4,097 for the IDT72V253, 8,193
for the IDT72V263, 16,385 for the IDT72V273, 32,769 for the IDT72V283 and 65,537 for the IDT72V293. If both x9 Input and x9 Output bus Widths are selected, D = 1,025 for the
IDT72V223, 2,049 for the IDT72V233, 4,097 for the IDT72V243, 8,193 for the IDT72V253, 16,385 for the IDT72V263, 32,769 for the IDT72V273, 65,537 for the IDT72V283 and 131,073
for the IDT72V293.
3. PAF is asserted to LOW on WCLK transition and reset to HIGH on RCLK transition.
4. Select this mode by setting PFM LOW during Master Reset.
Figure 20. Asynchronous Programmable Almost-Full Flag Timing (IDT Standard and FWFT Modes)
34
BUS FIFO
IDT72V223/233/243/253/263/273/283/293
3.3V
HIGH DENSITY
SUPERSYNC
IITM NARROW
IDT72V263/273/283/293/103/113
3.3V HIGH
DENSITY
SUPERSYNC
IITM NARROW
BUS FIFO
8K
9/18,2K
32K
x 9/18,
x 9/18,
9/18,x256K
9/18,
512K64K
x9 x 9/18, 128K x 9
512xx18,
18,16K
1K xx 9/18,
x 9/18,
4K64K
x 9/18,
8K 128K
x 9/18,x 16K
9/18, x32K
x 9/18,
tCLKH
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
tCLKL
WCLK
tENS
tENH
WEN
PAE
tPAEA
n words in FIFO(2),
n + 1 words in FIFO(3)
n words in FIFO(2),
n + 1 words in FIFO(3)
n + 1 words in FIFO(2),
n + 2 words in FIFO(3)
tPAEA
RCLK
tENS
REN
4666 drw24
NOTES:
1. n = PAE offset.
2. For IDT Standard Mode.
3. For FWFT Mode.
4. PAE is asserted LOW on RCLK transition and reset to HIGH on WCLK transition.
5. Select this mode by setting PFM LOW during Master Reset.
Figure 21. Asynchronous Programmable Almost-Empty Flag Timing (IDT Standard and FWFT Modes)
tCLKH
tCLKL
WCLK
tENH
tENS
WEN
[ D2 + 1] words in FIFO(1),
[ D +2 1 ] + 1 words in FIFO
tHF
HF
D/2 words in FIFO(1),
(2)
[ D 2+ 1 ] words in FIFO(2)
D/2 words in FIFO(1),
[ D +2 1 ] words in FIFO(2)
tHF
RCLK
tENS
REN
4666 drw25
NOTES:
1. In IDT Standard mode: D = maximum FIFO depth. If x18 Input or x18 Output bus Width is selected, D = 512 for the IDT72V223, 1,024 for the IDT72V233, 2,048 for the IDT72V243,
4,096 for the IDT72V253, 8,192 for the IDT72V263, 16,384 for the IDT72V273, 32,768 for the IDT72V283 and 65,536 for the IDT72V293. If both x9 Input and x9 Output bus Widths
are selected, D = 1,024 for the IDT72V223, 2,048 for the IDT72V233, 4,096 for the IDT72V243, 8,192 for the IDT72V253, 16,384 for the IDT72V263, 32,768 for the IDT72V273,
65,536 for the IDT72V283 and 131,072 for the IDT72V293.
2. In FWFT mode: D = maximum FIFO depth. If x18 Input or x18 Output bus Width is selected, D = 513 for the IDT72V223, 1,025 for the IDT72V233, 2,049 for the IDT72V243, 4,097
for the IDT72V253, 8,193 for the IDT72V263, 16,385 for the IDT72V273, 32,769 for the IDT72V283 and 65,537 for the IDT72V293. If both x9 Input and x9 Output bus Widths are
selected, D = 1,025 for the IDT72V223, 2,049 for the IDT72V233, 4,097 for the IDT72V243, 8,193 for the IDT72V253, 16,385 for the IDT72V263, 32,769 for the IDT72V273, 65,537
for the IDT72V283 and 131,073 for the IDT72V293.
Figure 22. Half-Full Flag Timing (IDT Standard and FWFT Modes)
35
IDT72V223/233/243/253/263/273/283/293 3.3V HIGH DENSITY SUPERSYNC IITM NARROW BUS FIFO
512 x 18, 1K x 9/18, 2K x 9/18, 4K x 9/18, 8K x 9/18, 16K x 9/18, 32K x 9/18, 64K x 9/18, 128K x 9
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
RCLK
tENS
REN
tENH
tA
Qn
W0
W1
tFFA
FF
tFFA
tFFA
tCYC
WR
tDS
Dn
tCYH
tDH
WD
WD+1
4666 drw26
NOTE:
1. OE = LOW and WEN = LOW.
Figure 23. Asynchronous Write, Synchronous Read, Full Flag Operation (IDT Standard Mode)
1
RCLK
2
tENS
REN
tENH
tA
tA
Qn
Last Word
W1
W0
tREF
tREF
EF
tCYL
tSKEW
WR
tCYH
tCYC
tDH
tDS
Dn
W0
tDH
tDS
W1
4666 drw27
NOTE:
1. OE = LOW and WEN = LOW.
Figure 24. Asynchronous Write, Synchronous Read, Empty Flag Operation (IDT Standard Mode)
36
BUS FIFO
IDT72V223/233/243/253/263/273/283/293
3.3V
HIGH DENSITY
SUPERSYNC
IITM NARROW
IDT72V263/273/283/293/103/113
3.3V HIGH
DENSITY
SUPERSYNC
IITM NARROW
BUS FIFO
8K
9/18,2K
32K
x 9/18,
x 9/18,
9/18,x256K
9/18,
512K64K
x9 x 9/18, 128K x 9
512xx18,
18,16K
1K xx 9/18,
x 9/18,
4K64K
x 9/18,
8K 128K
x 9/18,x 16K
9/18, x32K
x 9/18,
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
No Write
WCLK
1
2
WEN
Dn
DF
tWFF
DF+1
tWFF
FF
tCYC
tSKEW
tCYL
tCYH
RD
tAA
tAA
Qn
Last Word
WX
WX+1
4666 drw28
NOTE:
1. OE = LOW and REN = LOW.
2. Asynchronous Read is available in IDT Standard Mode only.
Figure 25. Synchronous Write, Asynchronous Read, Full Flag Operation (IDT Standard Mode)
WCLK
tENS
tENH
tDS
tDH
WEN
Dn
EF
W0
tEFA
tRPE
tEFA
RD
tCYH
tAA
Qn
Last Word in Output Register
W0
4666 drw29
NOTE:
1. OE = LOW and REN = LOW.
2. Asynchronous Read is available in IDT Standard Mode only.
Figure 26. Synchronous Write, Asynchronous Read, Empty Flag Operation (IDT Standard Mode)
37
IDT72V223/233/243/253/263/273/283/293 3.3V HIGH DENSITY SUPERSYNC IITM NARROW BUS FIFO
512 x 18, 1K x 9/18, 2K x 9/18, 4K x 9/18, 8K x 9/18, 16K x 9/18, 32K x 9/18, 64K x 9/18, 128K x 9
tCYH
tCYC
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
tCYL
WR
tDH
Dn
tDH
tDS
W0
W1
RD
tAA
tAA
Qn
W1
W0
Last Word in O/P Register
tRPE
tEFA
tEFA
EF
4666 drw30
NOTES:
1. OE = LOW, WEN = LOW, and REN = LOW.
2. Asynchronous Read is available in IDT Standard Mode only.
Figure 27. Asynchronous Write, Asynchronous Read, Empty Flag Operation (IDT Standard Mode)
tCYC
tCYH
tCYL
WR
tDH
tDS
Dn
tDH
tDS
Wy+1
Wy
tCYC
tCYH
tCYL
RD
tAA
Qn
Wx
tAA
Wx+1
Wx+2
tFFA
tFFA
FF
4666 drw31
NOTES:
1. OE = LOW, WEN = LOW, and REN = LOW.
2. Asynchronous Read is available in IDT Standard Mode only.
Figure 28. Asynchronous Write, Asynchronous Read, Full Flag Operation (IDT Standard Mode)
38
BUS FIFO
IDT72V223/233/243/253/263/273/283/293
3.3V
HIGH DENSITY
SUPERSYNC
IITM NARROW
IDT72V263/273/283/293/103/113
3.3V HIGH
DENSITY
SUPERSYNC
IITM NARROW
BUS FIFO
8K
9/18,2K
32K
x 9/18,
x 9/18,
9/18,x256K
9/18,
512K64K
x9 x 9/18, 128K x 9
512xx18,
18,16K
1K xx 9/18,
x 9/18,
4K64K
x 9/18,
8K 128K
x 9/18,x 16K
9/18, x32K
x 9/18,
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
composite flags can be created by ORing OR of every FIFO, and separately
ORing IR of every FIFO.
Figure 29 demonstrates a width expansion using two IDT72V223/72V233/
72V243/72V253/72V263/72V273/72V283/72V293 devices. If x18 Input or
x18 Output bus Width is selected, D0-D17 from each device form a 36-bit wide
input bus and Q0-Q17 from each device form a 36-bit wide output bus. If both
x9 Input and x9 Output bus Widths are selected, D0-D8 from each device form
an 18-bit wide input bus and Q0-Q8 from each device form an 18-bit wide output
bus. Any word width can be attained by adding additional IDT72V223/72V233/
72V243/72V253/72V263/72V273/72V283/72V293 devices.
OPTIONAL CONFIGURATIONS
WIDTH EXPANSION CONFIGURATION
Word width may be increased simply by connecting together the control
signals of multiple devices. Status flags can be detected from any one
device. The exceptions are the EF and FF functions in IDT Standard mode
and the IR and OR functions in FWFT mode. Because of variations in skew
between RCLK and WCLK, it is possible for EF/FF deassertion and IR/OR
assertion to vary by one cycle between FIFOs. In IDT Standard mode, such
problems can be avoided by creating composite flags, that is, ANDing EF
of every FIFO, and separately ANDing FF of every FIFO. In FWFT mode,
PARTIAL RESET (PRS)
MASTER RESET (MRS)
FIRST WORD FALL THROUGH/
SERIAL INPUT (FWFT/SI)
RETRANSMIT (RT)
DATA IN
m+n
Dm+1 - Dn
D0 - Dm m
n
READ CLOCK (RCLK)
WRITE CLOCK (WCLK)
WRITE ENABLE (WEN)
LOAD (LD)
FULL FLAG/INPUT READY (FF/IR) #1
(1)
GATE
FULL FLAG/INPUT READY (FF/IR) #2
PROGRAMMABLE (PAF)
HALF-FULL FLAG (HF)
IDT
72V223
72V233
72V243
72V253
72V263
72V273
72V283
72V293
IDT
72V223
72V233
72V243
72V253
72V263
72V273
72V283
72V293
READ ENABLE (REN)
OUTPUT ENABLE (OE)
PROGRAMMABLE (PAE)
EMPTY FLAG/OUTPUT READY (EF/OR) #1
EMPTY FLAG/OUTPUT READY (EF/OR) #2
n
FIFO
#1
m
FIFO
#2
Q0 - Qm
Qm+1 - Qn
m+n
(1)
GATE
DATA OUT
4666 drw32
NOTES:
1. Use an AND gate in IDT Standard mode, an OR gate in FWFT mode.
2. Do not connect any output control signals directly together.
3. FIFO #1 and FIFO #2 must be the same depth, but may be different word widths.
Figure 29. Block Diagram of Width Expansion
For the x18 Input or x18 Output bus Width: 512 x 36, 1,024 x 36, 2,048 x 36, 4,096 x 36, 8,192 x 36, 16,384 x 36, 32,768 x 36 and 65,536 x 36
For both x9 Input and x9 Output bus Widths: 1,024 x 18, 2,048 x 18, 4,096 x 18, 8,192 x 18, 16,284 x 18, 32,768 x 18, 65,536 x 18 and 131,072 x 18
39
IDT72V223/233/243/253/263/273/283/293 3.3V HIGH DENSITY SUPERSYNC IITM NARROW BUS FIFO
512 x 18, 1K x 9/18, 2K x 9/18, 4K x 9/18, 8K x 9/18, 16K x 9/18, 32K x 9/18, 64K x 9/18, 128K x 9
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
FWFT/SI
TRANSFER CLOCK
WRITE CLOCK
WCLK
WRITE ENABLE
WEN
INPUT READY
IR
DATA IN
n
Dn
FWFT/SI
IDT
72V223
72V233
72V243
72V253
72V263
72V273
72V283
72V293
WCLK
RCLK
OR
WEN
REN
OE
Qn
IR
GND
n
Dn
FWFT/SI
IDT
72V223
72V233
72V243
72V253
72V263
72V273
72V283
72V293
READ CLOCK
RCLK
REN
READ ENABLE
OR
OUTPUT READY
OE
OUTPUT ENABLE
Qn
n
DATA OUT
4666 drw33
Figure 30. Block Diagram of Depth Expansion
For the x18 Input or x18 Output bus Width: 1,024 x 18, 2,048 x 18, 4,096 x 18, 8,192 x 18, 16,384 x 18, 32,768 x 18, 65,536 x 18 and 131,072 x 18
For both x9 Input and x9 Output bus Widths: 2,048 x 9, 4,096 x 9, 8,192 x 9, 16,384 x 9, 32,768 x 9, 65,536 x 9, 131,072 x 9 and 262,144 x 9
DEPTH EXPANSION CONFIGURATION (FWFT MODE ONLY)
The IDT72V223 can easily be adapted to applications requiring depths
greater than 512 when the x18 Input or x18 Output bus Width is selected, 1,024
for the IDT72V233, 2,048 for the IDT72V243, 4,096 for the IDT72V253, 8,192
for the IDT72V263, 16,384 for the IDT72V273, 32,768 for the IDT72V283 and
65,536 for the IDT72V293. When both x9 Input and x9 Output bus Widths are
selected, depths greater than 1,024 can be adapted for the IDT72V223, 2,048
for the IDT72V233, 4,096 for the IDT72V243, 8,192 for the IDT72V253, 16,384
for the IDT72V263, 32,768 for the IDT72V273, 65,536 for the IDT72V283 and
131,072 for the IDT72V293. In FWFT mode, the FIFOs can be connected in
series (the data outputs of one FIFO connected to the data inputs of the next)
with no external logic necessary. The resulting configuration provides a total
depth equivalent to the sum of the depths associated with each single FIFO.
Figure 30 shows a depth expansion using two IDT72V223/72V233/72V243/
72V253/72V263/72V273/72V283/72V293 devices.
Care should be taken to select FWFT mode during Master Reset for all FIFOs
in the depth expansion configuration. The first word written to an empty
configuration will pass from one FIFO to the next ("ripple down") until it finally
appears at the outputs of the last FIFO in the chain–no read operation is
necessary but the RCLK of each FIFO must be free-running. Each time the data
word appears at the outputs of one FIFO, that device's OR line goes LOW,
enabling a write to the next FIFO in line.
For an empty expansion configuration, the amount of time it takes for OR of
the last FIFO in the chain to go LOW (i.e. valid data to appear on the last FIFO's
outputs) after a word has been written to the first FIFO is the sum of the delays
for each individual FIFO:
(N – 1)*(4*transfer clock) + 3*TRCLK
where N is the number of FIFOs in the expansion and TRCLK is the RCLK period.
Note that extra cycles should be added for the possibility that the tSKEW1
specification is not met between WCLK and transfer clock, or RCLK and transfer
clock, for the OR flag.
The "ripple down" delay is only noticeable for the first word written to an empty
depth expansion configuration. There will be no delay evident for subsequent
words written to the configuration.
The first free location created by reading from a full depth expansion
configuration will "bubble up" from the last FIFO to the previous one until it
finally moves into the first FIFO of the chain. Each time a free location is
created in one FIFO of the chain, that FIFO's IR line goes LOW, enabling the
preceding FIFO to write a word to fill it.
For a full expansion configuration, the amount of time it takes for IR of the first
FIFO in the chain to go LOW after a word has been read from the last FIFO is
the sum of the delays for each individual FIFO:
(N – 1)*(3*transfer clock) + 2 TWCLK
where N is the number of FIFOs in the expansion and TWCLK is the WCLK
period. Note that extra cycles should be added for the possibility that the tSKEW1
specification is not met between RCLK and transfer clock, or WCLK and transfer
clock, for the IR flag.
The Transfer Clock line should be tied to either WCLK or RCLK, whichever
is faster. Both these actions result in data moving, as quickly as possible, to the
end of the chain and free locations to the beginning of the chain.
40
BUS FIFO
IDT72V223/233/243/253/263/273/283/293
3.3V
HIGH DENSITY
SUPERSYNC
IITM NARROW
IDT72V263/273/283/293/103/113
3.3V HIGH
DENSITY
SUPERSYNC
IITM NARROW
BUS FIFO
8K
9/18,2K
32K
x 9/18,
x 9/18,
9/18,x256K
9/18,
512K64K
x9 x 9/18, 128K x 9
512xx18,
18,16K
1K xx 9/18,
x 9/18,
4K64K
x 9/18,
8K 128K
x 9/18,x 16K
9/18, x32K
x 9/18,
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
tTCK
t3
t4
t1
t2
TCK
TDI/
TMS
tDS
tDH
TDO
TDO
t6
tDO
TRST
4666 drw34
Notes to diagram:
t1 = tTCKLOW
t2 = tTCKHIGH
t3 = tTCKFALL
t4 = tTCKRise
t5 = tRST (reset pulse width)
t6 = tRSR (reset recovery)
t5
Figure 31. Standard JTAG Timing
JTAG AC ELECTRICAL
CHARACTERISTICS
SYSTEM INTERFACE PARAMETERS
(VCC = 3.3V ± 5%; Tcase = 0°C to +85°C)
IDT72V223
IDT72V233
IDT72V243
IDT72V253
IDT72V263
IDT72V273
IDT72V283
IDT72V293
Test Conditions
Test
Conditions Min.
Max. Units
JTAG Clock Input Period tTCK
-
100
-
ns
JTAG Clock HIGH
tTCKHIGH
-
40
-
ns
JTAG Clock Low
tTCKLOW
-
40
-
ns
JTAG Clock Rise Time
tTCKRise
-
-
5(1)
ns
(1)
Symbol
Data Output
tDO = Max
-
20
ns
JTAG Clock Fall Time
tTCKFall
-
-
5
ns
Data Output Hold
tDOH
0
-
ns
JTAG Reset
tRST
-
50
-
ns
Data Input
tDS
tDH
10
10
-
ns
JTAG Reset Recovery
tRSR
-
50
-
ns
trise=3ns
tfall=3ns
Max. Units
Symbol
Parameter
(1)
Min.
Parameter
NOTE:
1. Guaranteed by design.
NOTE:
1. 50pf loading on external output signals.
41
IDT72V223/233/243/253/263/273/283/293 3.3V HIGH DENSITY SUPERSYNC IITM NARROW BUS FIFO
512 x 18, 1K x 9/18, 2K x 9/18, 4K x 9/18, 8K x 9/18, 16K x 9/18, 32K x 9/18, 64K x 9/18, 128K x 9
JTAG INTERFACE
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
The Standard JTAG interface consists of four basic elements:
Test Access Port (TAP)
TAP controller
Instruction Register (IR)
Data Register Port (DR)
•
•
•
•
Five additional pins (TDI, TDO, TMS, TCK and TRST) are provided to
support the JTAG boundary scan interface. The IDT72V223/72V233/72V243/
72V253/72V263/72V273/72V283/72V293 incorporates the necessary tap
controller and modified pad cells to implement the JTAG facility.
Note that IDT provides appropriate Boundary Scan Description Language
program files for these devices.
The following sections provide a brief description of each element. For a
complete description refer to the IEEE Standard Test Access Port Specification
(IEEE Std. 1149.1-1990).
The Figure below shows the standard Boundary-Scan Architecture
DeviceID Reg.
Mux
Boundary Scan Reg.
Bypass Reg.
TDO
TDI
T
A
TMS
TCLK
TRST
P
TAP
Controller
clkDR, ShiftDR
UpdateDR
Instruction Decode
clklR, ShiftlR
UpdatelR
Instruction Register
Control Signals
4666 drw35
Figure 32. Boundary Scan Architecture
THE TAP CONTROLLER
The Tap controller is a synchronous finite state machine that responds to
TMS and TCLK signals to generate clock and control signals to the Instruction
and Data Registers for capture and update of data.
TEST ACCESS PORT (TAP)
The Tap interface is a general-purpose port that provides access to the
internal of the processor. It consists of four input ports (TCLK, TMS, TDI, TRST)
and one output port (TDO).
42
BUS FIFO
IDT72V223/233/243/253/263/273/283/293
3.3V
HIGH DENSITY
SUPERSYNC
IITM NARROW
IDT72V263/273/283/293/103/113
3.3V HIGH
DENSITY
SUPERSYNC
IITM NARROW
BUS FIFO
8K
9/18,2K
32K
x 9/18,
x 9/18,
9/18,x256K
9/18,
512K64K
x9 x 9/18, 128K x 9
512xx18,
18,16K
1K xx 9/18,
x 9/18,
4K64K
x 9/18,
8K 128K
x 9/18,x 16K
9/18, x32K
x 9/18,
1
Test-Logic
Reset
0
0
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
Run-Test/
Idle
1
SelectDR-Scan
1
SelectIR-Scan
1
0
1
0
Capture-IR
1
Capture-DR
0
0 0
Shift-DR
1
Input = TMS
EXit1-DR
Shift-IR
1
1
0
1
Exit2-DR
Exit2-IR
0
1
1
Update-DR
0
0
Pause-IR
1
1
1
Exit1-IR
0 0
Pause-DR
0
0
Update-IR
1
0
4666 drw36
NOTES:
1. Five consecutive TCK cycles with TMS = 1 will reset the TAP.
2. TAP controller does not automatically reset upon power-up. The user must provide a reset to the TAP controller (either by TRST or TMS).
3. TAP controller must be reset before normal FIFO operations can begin.
Figure 33. TAP Controller State Diagram
UPDATE-DR
The shifting process has been completed. The data is latched into their
parallel outputs in this state to be accessed through the internal bus.
Refer to the IEEE Standard Test Access Port Specification (IEEE Std.
1149.1) for the full state diagram
All state transitions within the TAP controller occur at the rising edge of the
TCLK pulse. The TMS signal level (0 or 1) determines the state progression
that occurs on each TCLK rising edge. The TAP controller takes precedence
over the FIFO memory and must be reset after power up of the device. See
TRST description for more details on TAP controller reset.
EXIT1-DR / EXIT2-DR
This is a temporary controller state. If TMS is held high, a rising edge applied
to TCK while in this state causes the controller to enter the Update-DR state. This
terminates the scanning process. All test data registers selected by the current
instruction retain their previous state unchanged.
CAPTURE-DR
Data is loaded from the parallel input pins or core outputs into the Data
Register.
PAUSE-DR
This controller state allows shifting of the test data register in the serial path
between TDI and TDO to be temporarily halted. All test data registers selected
by the current instruction retain their previous state unchanged.
SHIFT-DR
The previously captured data is shifted in serially, LSB first at the rising edge
of TCLK in the TDI/TDO path and shifted out serially, LSB first at the falling edge
of TCLK towards the output.
Capture-IR, Shift-IR and Update-IR, Exit-IR and Pause-IR are
similar to Data registers. These instructions operate on the instruction registers.
43
IDT72V223/233/243/253/263/273/283/293 3.3V HIGH DENSITY SUPERSYNC IITM NARROW BUS FIFO
512 x 18, 1K x 9/18, 2K x 9/18, 4K x 9/18, 8K x 9/18, 16K x 9/18, 32K x 9/18, 64K x 9/18, 128K x 9
THE INSTRUCTION REGISTER
31(MSB)
28 27
12 11
1 0(LSB)
Version (4 bits) Part Number (16-bit) Manufacturer ID (11-bit)
0X0
0X33
1
The Instruction register allows an instruction to be shifted in serially into the
processor at the rising edge of TCLK.
The Instruction is used to select the test to be performed, or the test data
register to be accessed, or both. The instruction shifted into the register is latched
at the completion of the shifting process when the TAP controller is at UpdateIR state.
The instruction register must contain 4 bit instruction register-based cells
which can hold instruction data. These mandatory cells are located nearest the
serial outputs they are the least significant bits.
IDT72V223/233/243/253/263/273/283/293 JTAG Device Identification Register
JTAG INSTRUCTION REGISTER
The Instruction register allows instruction to be serially input into the device
when the TAP controller is in the Shift-IR state. The instruction is decoded to
perform the following:
•
Select test data registers that may operate while the instruction is
current. The other test data registers should not interfere with chip
operation and the selected data register.
•
Define the serial test data register path that is used to shift data between
TDI and TDO during data register scanning.
The Instruction Register is a 4 bit field (i.e. IR3, IR2, IR1, IR0) to decode
16 different possible instructions. Instructions are decoded as follows.
TEST DATA REGISTER
The Test Data register contains three test data registers: the Bypass, the
Boundary Scan register and Device ID register.
These registers are connected in parallel between a common serial input
and a common serial data output.
The following sections provide a brief description of each element. For a
complete description, refer to the IEEE Standard Test Access Port Specification
(IEEE Std. 1149.1-1990).
Hex
Value
0x00
0x02
0x01
0x03
0x0F
TEST BYPASS REGISTER
The register is used to allow test data to flow through the device from TDI
to TDO. It contains a single stage shift register for a minimum length in serial path.
When the bypass register is selected by an instruction, the shift register stage
is set to a logic zero on the rising edge of TCLK when the TAP controller is in
the Capture-DR state.
The operation of the bypass register should not have any effect on the
operation of the device in response to the BYPASS instruction.
Instruction
Function
EXTEST
IDCODE
SAMPLE/PRELOAD
HI-Z
BYPASS
Select Boundary Scan Register
Select Chip Identification data register
Select Boundary Scan Register
JTAG
Select Bypass Register
Table 6. JTAG Instruction Register Decoding
The following sections provide a brief description of each instruction. For
a complete description refer to the IEEE Standard Test Access Port Specification
(IEEE Std. 1149.1-1990).
THE BOUNDARY-SCAN REGISTER
The Boundary Scan Register allows serial data TDI be loaded in to or read
out of the processor input/output ports. The Boundary Scan Register is a part
of the IEEE 1149.1-1990 Standard JTAG Implementation.
EXTEST
The mandatory EXTEST instruction is provided for external circuity and
board level interconnection check.
IDCODE
This instruction is provided to select Device Identification Register to read
out manufacture’s identity, part number and version number.
THE DEVICE IDENTIFICATION REGISTER
The Device Identification Register is a Read Only 32-bit register used to
specify the manufacturer, part number and version of the processor to be
determined through the TAP in response to the IDCODE instruction.
IDT JEDEC ID number is 0xB3. This translates to 0x33 when the parity
is dropped in the 11-bit Manufacturer ID field.
For the IDT72V223/72V233/72V243/72V253/72V263/72V273/72V283/
72V293, the Part Number field contains the following values:
Device
IDT72V223
IDT72V233
IDT72V243
IDT72V253
IDT72V263
IDT72V273
IDT72V283
IDT72V293
COMMERCIAL AND INDUSTRIAL
TEMPERATURE RANGES
SAMPLE/PRELOAD
The mandatory SAMPLE/PRELOAD instruction allows data values to be
loaded onto the latched parallel outputs of the boundary-scan shift register prior
to selection of the boundary-scan test instruction. The SAMPLE instruction
allows a snapshot of data flowing from the system pins to the on-chip logic or vice
versa.
Part# Field
04EF
04EE
04ED
04EC
04EB
04EA
04E9
04E8
HIGH-Z
This instruction places all the output pins on the device into a high impedance
state.
BYPASS
The Bypass instruction contains a single shift-register stage and is set to
provide a minimum-length serial path between the TDI and the TDO pins of the
device when no test operation of the device is required.
44
ORDERING INFORMATION
IDT
XXXXX
X
XX
X
Device Type
Power
Speed
Package
X
Process /
Temperature
Range
BLANK
I(1)
Commercial (0°C to +70°C)
Industrial (-40°C to +85°C)
PF
BC
Thin Plastic Quad Flatpack (TQFP, PN80-1)
Ball Grid Array (BGA, BC100-1)
6
7-5
10
15
Commercial, BGA & TQFP Only
Commercial, BGA & TQFP Only
Com’l & Ind’l, TQFP Only
Commercial, TQFP Only
L
Low Power
72V223(2)
72V233(2)
72V243(2)
72V253(2)
72V263
72V273
72V283
72V293
512 x 18/1,024 x 9  3.3V SuperSync II FIFO
1,024 x 18/2,048 x 9  3.3V SuperSync II FIFO
2,048 x 18/4,096 x 9  3.3V SuperSync II FIFO
4,096 x 18/8,192 x 9  3.3V SuperSync II FIFO
8,192 x 18/16,384 x 9  3.3V SuperSync II FIFO
16,384 x 18/32,768 x 9  3.3V SuperSync II FIFO
32,768 x 18/65,536 x 9  3.3V SuperSync II FIFO
65,536 x 18/131,072 x 9  3.3V SuperSync II FIFO
NOTE:
1. Industrial temperature range product for the 10ns is available as a standard device. All other speed grades are available by special order.
2. The IDT72V223/72V233/72V243/72V253 are only available in 6ns and 7.5ns speed grades.
Clock Cycle Time (tCLK)
Speed in Nanoseconds
4666 drw37
DATASHEET DOCUMENT HISTORY
12/18/2000
03/27/2001
04/06/2001
12/14/2001
12/20/2001
02/01/2002
03/25/2002
05/24/2002
01/20/2003
02/11/2003
07/15/2003
09/29/2003
pgs. 7, 8, 9, and 37.
pgs. 9, and 37.
pgs. 4, 5, and 21.
pgs. 1-45.
pg. 9.
pgs. 9, and 45.
pgs. 2, and 41.
pgs. 3, and 11.
pgs. 1, 7, 9, 10, and 15.
pgs. 7, and 43.
pgs. 3, 19, and 36-38.
pg. 8.
CORPORATE HEADQUARTERS
2975 Stender Way
Santa Clara, CA 95054
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800-345-7015 or 408-727-6116
fax: 408-492-8674
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45
for Tech Support:
408-330-1753
email: [email protected]