AMICC A43L0616BV-6F

A43L0616B
Preliminary
512K X 16 Bit X 2 Banks Synchronous DRAM
Document Title
512K X 16 Bit X 2 Banks Synchronous DRAM
Revision History
Rev. No.
0.0
PRELIMINARY
History
Issue Date
Remark
Initial issue
May 10, 2005
Preliminary
(May, 2005, Version 0.0)
AMIC Technology, Corp.
A43L0616B
Preliminary
512K X 16 Bit X 2 Banks Synchronous DRAM
Features
Industrial operating temperature range: -40ºC to +85ºC
for –U
Pb-Free type for -F
Burst Read Single-bit Write operation
DQM for masking
Auto & self refresh
32ms refresh period (2K cycle)
50 Pin TSOP (II)
JEDEC standard 3.3V power supply
LVTTL compatible with multiplexed address
Dual banks / Pulse RAS
MRS cycle with address key programs
- CAS Latency (2,3)
- Burst Length (1,2,4,8 & full page)
- Burst Type (Sequential & Interleave)
All inputs are sampled at the positive going edge of the
system clock
General Description
The A43L0616B is 16,777,216 bits synchronous high data
rate Dynamic RAM organized as 2 X 524,288 words by 16
bits, fabricated with AMIC’s high performance CMOS
technology. Synchronous design allows precise cycle control
with the use of system clock. I/O transactions are possible on
every clock cycle. Range of operating frequencies,
programmable latencies allows the same device to be useful
for a variety of high bandwidth, high performance memory
system applications.
Pin Configuration
VSS
A4
A5
A6
A7
A8
A9
NC
CKE
CLK
UDQM
NC/RFU
VDDQ
DQ8
DQ9
VSSQ
DQ10
DQ11
VDDQ
DQ12
DQ13
VSSQ
DQ14
DQ15
VSS
TSOP (II)
50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26
PRELIMINARY
1
VDD
A3
A2
A1
A0
A10/AP
BA
CS
RAS
CAS
WE
LDQM
VDDQ
DQ7
DQ4
(May, 2005, Version 0.0)
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
DQ6
8
VSSQ
7
DQ5
6
DQ3
5
VDDQ
4
DQ2
DQ0
3
DQ1
2
VSSQ
1
VDD
A43L0616BV
AMIC Technology, Corp.
A43L0616B
Block Diagram
LWE
I/O Control
Data Input Register
Bank Select
Output Buffer
Sense AMP
512K X 16
DQi
Column Decoder
Column Buffer
LCBR
LRAS
Address Register
ADD
Row Decoder
Row Buffer
Refresh Counter
CLK
512K X 16
LDQM
Latency & Burst Length
LRAS
Programming Register
LCAS
LRAS
LCBR
LDQM
LWE
LWCBR
Timing Register
CLK
PRELIMINARY
CKE
(May, 2005, Version 0.0)
CS
RAS
CAS
2
WE
L(U)DQM
AMIC Technology, Corp.
A43L0616B
Pin Descriptions
Symbol
Name
Description
CLK
System Clock
Active on the positive going edge to sample all inputs.
CS
Chip Select
Disables or Enables device operation by masking or enabling all inputs except CLK,
CKE and L(U)DQM
Masks system clock to freeze operation from the next clock cycle.
CKE
Clock Enable
CKE should be enabled at least one clock + tss prior to new command.
Disable input buffers for power down in standby.
Row / Column addresses are multiplexed on the same pins.
A0~A10/AP
Address
Row address : RA0~RA10, Column address: CA0~CA7
Selects bank to be activated during row address latch time.
BA
Bank Select Address
Selects band for read/write during column address latch time.
RAS
Row Address Strobe
Latches row addresses on the positive going edge of the CLK with RAS low.
Enables row access & precharge.
Column Address
Strobe
Latches column addresses on the positive going edge of the CLK with CAS low.
WE
Write Enable
Enables write operation and Row precharge.
Data Input/Output
Mask
Makes data output Hi-Z, t SHZ after the clock and masks the output.
L(U)DQM
Blocks data input when L(U)DQM active.
DQ0-15
Data Input/Output
Data inputs/outputs are multiplexed on the same pins.
VDD/VSS
Power
Supply/Ground
Power Supply: +3.3V±0.3V/Ground
VDDQ/VSSQ
Data Output
Power/Ground
Provide isolated Power/Ground to DQs for improved noise immunity.
NC/RFU
No Connection
CAS
PRELIMINARY
Enables column access.
(May, 2005, Version 0.0)
3
AMIC Technology, Corp.
A43L0616B
Absolute Maximum Ratings*
*Comments
Voltage on any pin relative to VSS (Vin, Vout ) . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -1.0V to +4.6V
Voltage on VDD supply relative to VSS (VDD, VDDQ )
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -1.0V to +4.6V
Storage Temperature (TSTG) . . . . . . . . . . -55°C to +150°C
Soldering Temperature X Time (TSLODER) . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260°C X 10sec
Power Dissipation (PD) . . . . . . . . . . . . . . . . . . . . . . . . . 1W
Short Circuit Current (Ios) . . . . . . . . . . . . . . . . . . . . 50mA
Permanent device damage may occur if “Absolute Maximum
Ratings” are exceeded.
Functional operation should be restricted to recommended
operating condition.
Exposure to higher than recommended voltage for extended
periods of time could affect device reliability.
Capacitance (TA=25°C, f=1MHz)
Parameter
Symbol
Input Capacitance
Data Input/Output Capacitance
Condition
Min
Typ
Max
Unit
CI1
A0 to A10, BA
2
4
pF
CI2
CLK, CKE, CS , RAS , CAS , WE ,
UDQM, LDQM
2
4
pF
CI/O
DQ0 to DQ15
2
6
pF
DC Electrical Characteristics
Recommend operating conditions (Voltage referenced to VSS = 0V, TA = 0ºC to +70ºC or -40ºC to +85ºC)
Parameter
Symbol
Min
Typ
Max
Unit
VDD,VDDQ
3.0
3.3
3.6
V
Input High Voltage
VIH
2.0
3.0
VDD+0.3
V
Input Low Voltage
VIL
-0.3
0
0.8
V
Note 1
Output High Voltage
VOH
2.4
-
-
V
IOH = -2mA
Output Low Voltage
VOL
-
-
0.4
V
IOL = 2mA
Input Leakage Current
IIL
-5
-
5
µA
Note 2
Output Leakage Current
IOL
-5
-
5
µA
Note 3
Supply Voltage
Output Loading Condition
Note
See Figure 1
Note: 1. VIL (min) = -1.5V AC (pulse width ≤ 5ns).
2. Any input 0V ≤ VIN ≤ VDD + 0.3V, all other pins are not under test = 0V
3. Dout is disabled, 0V ≤ Vout ≤ VDD
PRELIMINARY
(May, 2005, Version 0.0)
4
AMIC Technology, Corp.
A43L0616B
Decoupling Capacitance Guide Line
Recommended decoupling capacitance added to power line at board.
Parameter
Symbol
Value
Unit
Decoupling Capacitance between VDD and VSS
CDC1
0.1 + 0.01
µF
Decoupling Capacitance between VDDQ and VSSQ
CDC2
0.1 + 0.01
µF
Note: 1. VDD and VDDQ pins are separated each other.
All VDD pins are connected in chip. All VDDQ pins are connected in chip.
2. VSS and VSSQ pins are separated each other
All VSS pins are connected in chip. All VSSQ pins are connected in chip.
DC Electrical Characteristics
(Recommended operating condition unless otherwise noted, TA = 0 to 70°C or -40ºC to +85ºC)
Symbol
Icc1
Icc2 P
Icc2 PS
ICC2N
Parameter
ICC3 PS
ICC3N
ICC3NS
-6
-7
190
160
Burst Length = 1
tRC ≥ tRC(min), tCC ≥ tCC(min), IOL = 0mA
Precharge Standby
Current in powerdown mode
CKE ≤ VIL(max), tCC = 15ns
1
CKL ≤ VIL(max), tCC = ∞
1
CKE ≥ VIH(min), CS ≥ VIH(min), tCC = 15ns
Input signals are changed one time during 30ns
15
CKE ≥ VIH(min), CLK ≤ VIL(max), tCC = ∞
Input signals are stable.
4
CKE ≤ VIL(max), tCC = 15ns
2
CKE ≤ VIL(max) tCC = ∞
1
CKE ≥ VIH(min), CS ≥ VIH(min), tCC = 15ns
Input signals are changed one time during 30ns
25
CKE ≥ VIH(min), CLK ≤ VIL(max), tCC = ∞
Input signals are stable.
15
Precharge Standby
Current in non
power-down mode
Active Standby
Current in powerdown mode
Active Standby
current in non
power-down mode
(One Bank Active)
Operating Current
(Burst Mode)
IOL = 0mA, Page Burst
All bank Activated, tCCD = tCCD (min)
ICC5
Refresh Current
tRC ≥ tRC (min)
ICC6
Self Refresh
Current
CKE ≤ 0.2V
ICC4
Speed
CAS
Latency
Operating Current
(One Bank Active)
ICC2NS
ICC3 P
Test Conditions
Unit
Notes
mA
1
mA
mA
mA
mA
3
210
180
2
-
180
210
180
1
mA
1
mA
2
mA
Note: 1. Measured with outputs open. Addresses are changed only one time during tCC(min).
2. Refresh period is 32ms. Addresses are changed only one time during tCC(min).
PRELIMINARY
(May, 2005, Version 0.0)
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AMIC Technology, Corp.
A43L0616B
AC Operating Test Conditions
(VDD = 3.3V ±0.3V, TA = 0°C to +70°C or -40ºC to +85ºC)
Parameter
Value
AC input levels
VIH/VIL = 2.4V/0.4V
Input timing measurement reference level
1.4V
Input rise and all time (See note3)
tr/tf = 1ns/1ns
Output timing measurement reference level
1.4V
Output load condition
See Fig.2
3.3V
VOH(DC) = 2.4V, I OH = -2mA
VOL(DC) = 0.4V, I OL = 2mA
1200Ω
VTT =1.4V
50Ω
Output
ZO=50Ω
OUTPUT
870Ω
30pF
30pF
(Fig. 2) AC Output Load Circuit
(Fig. 1) DC Output Load Circuit
AC Characteristics
(AC operating conditions unless otherwise noted)
-6
Symbol
tCC
Parameter
CAS
Latency
Min
3
6
Max
Min
1000
2
8
3
-
Unit
Note
ns
1
ns
1,2
ns
2
-
ns
3
-
ns
3
Max
7
CLK cycle time
CLK to valid
-7
1000
8
5.5
-
6
tSAC
Output delay
tOH
Output data hold time
tCH
CLK high pulse width
2
6
2.5
3
tCL
-
2.5
2.5
-
2
2.5
3
2.5
3
2.5
-
2
(May, 2005, Version 0.0)
7
2.5
CLK low pulse width
PRELIMINARY
-
2.5
3
6
AMIC Technology, Corp.
A43L0616B
AC Characteristics (continued)
(AC operating conditions unless otherwise noted)
Symbol
Parameter
CAS
Latency
3
tSS
-6
Min
-7
Max
2
Min
Note
-
ns
3
Max
2
Input setup time
2
Unit
2.5
2.5
3
tSH
Input hold time
1
-
1
-
ns
3
1
-
1
-
ns
2
2
3
tSLZ
CLK to output in Low-Z
2
CLK to output
3
-
5.5
-
6
In Hi-Z
2
-
6
-
7
tSHZ
ns
*All AC parameters are measured from half to half.
Note : 1. Parameters depend on programmed CAS latency.
2. If clock rising time is longer than 1ns, (tr/2-0.5)ns should be added to the parameter.
3. Assumed input rise and fall time (tr & tf) = 1ns.
If tr & tf is longer than 1ns, transient time compensation should be considered,
i.e., [(tr + tf)/2-1]ns should be added to the parameter.
PRELIMINARY
(May, 2005, Version 0.0)
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AMIC Technology, Corp.
A43L0616B
Operating AC Parameter
(AC operating conditions unless otherwise noted)
Symbol
Parameter
Version
CAS
Latency
-6
-7
Unit
Note
tRRD(min)
Row active to row active delay
12
14
ns
1
tRCD(min)
RAS to CAS delay
18
20
ns
1
tRP(min)
Row precharge time
18
20
ns
1
42
42
ns
1
tRAS(min)
Row active time
tRAS(max)
µs
100
tRC(min)
Row cycle time
tCDL(min)
Last data in new col. Address delay
tRDL(min)
Last data in row precharge
tBDL(min)
Last data in to burst stop
tCCD(min)
Col. Address to col. Address delay
Number of valid output data
60
63
ns
1
CLK
2
CLK
2
1
CLK
2
1
CLK
3
2
CLK
2
1
CLK
1
2
2
4
Note: 1. The minimum number of clock cycles is determined by dividing the minimum time required with clock cycle time and
then rounding off to the next higher integer.
2. Minimum delay is required to complete write.
3. All parts allow every cycle column address change.
4. In case of row precharge interrupt, auto precharge and read burst stop.
PRELIMINARY
(May, 2005, Version 0.0)
8
AMIC Technology, Corp.
A43L0616B
Simplified Truth Table
Command
CKEn-1 CKEn
CS
RAS CAS
WE DQM BA A10/ A9~A0
Notes
AP
Register
Refresh
Mode Register Set
H
Auto Refresh
Self
Refresh
X
L
L
L
L
X
OP CODE
L
L
L
H
X
X
L
H
H
H
X
X
3
H
Entry
L
H
H
X
X
X
Bank Active & Row Addr.
H
X
L
L
H
H
X
V
Read &
Auto Precharge Disable
Column Addr. Auto Precharge Enable
H
X
L
H
L
H
X
V
Write &
Auto Precharge Disable
Column Addr. Auto Precharge Enable
H
X
L
H
L
L
X
V
Burst Stop
H
X
L
H
H
L
X
H
X
L
L
H
L
X
H
L
L
H
H
H
H
X
X
X
Exit
L
H
X
X
X
X
Entry
H
L
Clock Suspend or
Active Power Down
Entry
Precharge Power Down Mode
Exit
Column
Addr.
H
L
L
DQM
H
No Operation Command
H
H
L
H
H
H
H
X
X
X
L
V
V
V
H
X
X
X
X
X
L
H
H
H
H
X
X
X
3
Row Addr.
L
Bank Selection
Both Banks
3
3
L
Precharge
Exit
H
1,2
Column
Addr.
H
X
V
L
X
H
4
4
4,5
4
4,5
6
X
X
X
X
X
X
X
V
X
X
X
7
(V = Valid, X = Don’t Care, H = Logic High, L = Logic Low)
Note : 1. OP Code : Operand Code
A0~A10/AP,BA : Program keys. (@MRS)
2. MRS can be issued only at both banks precharge state.
A new command can be issued after 2 clock cycle of MRS.
3. Auto refresh functions as same as CBR refresh of DRAM.
The automatical precharge without Row precharge command is meant by “Auto”.
Auto/Self refresh can be issued only at both precharge state.
4. BA : Bank select address.
If “Low” at read, write, Row active and precharge, bank A is selected.
If “High” at read, write, Row active and precharge, bank B is selected.
If A10/AP is “High” at Row precharge, BA is ignored and both banks are selected.
5. During burst read or write with auto precharge, new read write command cannot be issued.
Another bank read write command can be issued at every burst length.
6. Burst stop command is valid at every burst length.
7. DQM sampled at positive going edge of a CLK masks the data-in at the very CLK (Write DQM latency is 0),
but makes the data-out Hi-Z state after 2 CLK cycles. (Read DQM latency is 2)
PRELIMINARY
(May, 2005, Version 0.0)
9
AMIC Technology, Corp.
A43L0616B
Mode Register Filed Table to Program Modes
Register Programmed with MRS
Address
BA
A10/AP
A9
Function
RFU
RFU
W.B.L
(Note 1)
A8
A7
A6
TM
A5
A4
A3
CAS Latency
A2
BT
A1
A0
Burst Length
(Note 2)
Test Mode
CAS Latency
Burst Type
Burst Length
A8
A7
Type
A6
A5
A4
Latency
A3
Type
A2
A1
A0
BT=0
BT=1
0
0
Mode Register Set
0
0
0
Reserved
0
Sequential
0
0
0
1
Reserved
0
1
Vendor
0
0
1
-
1
Interleave
0
0
1
2
Reserved
1
0
Use
0
1
0
2
0
1
0
4
4
1
1
Only
0
1
1
3
0
1
1
8
8
1
0
0
Reserved
1
0
0
Reserved
Reserved
Write Burst Length
A9
Length
1
0
1
Reserved
1
0
1
Reserved
Reserved
0
Burst
1
1
0
Reserved
1
1
0
Reserved
Reserved
1
Single Bit
1
1
1
Reserved
1
1
1
256(Full)
Reserved
(Note 3)
Power Up Sequence
1. Apply power and start clock, Attempt to maintain CKE = “H”, DQM = “H” and the other pins are NOP condition at inputs.
2. Maintain stable power, stable clock and NOP input condition for a minimum of 200µs.
3. Issue precharge commands for all banks of the devices.
4. Issue 2 or more auto-refresh commands.
5. Issue a mode register set command to initialize the mode register.
cf.) Sequence of 4 & 5 may be changed.
The device is now ready for normal operation.
Note : 1. RFU(Reserved for Future Use) should stay “0” during MRS cycle.
2. If A9 is high during MRS cycle, “Burst Read Single Bit Write” function will be enabled.
3. The full column burst (256bit) is available only at Sequential mode of burst type.
PRELIMINARY
(May, 2005, Version 0.0)
10
AMIC Technology, Corp.
A43L0616B
Burst Sequence (Burst Length = 4)
Initial address
Sequential
Interleave
A1
A0
0
0
0
1
2
3
0
1
2
3
0
1
1
2
3
0
1
0
3
2
1
0
2
3
0
1
2
3
0
1
1
1
3
0
1
2
3
2
1
0
Burst Sequence (Burst Length = 8)
Initial address
Sequential
Interleave
A2
A1
A0
0
0
0
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
0
0
1
1
2
3
4
5
6
7
0
1
0
3
2
5
4
7
6
0
1
0
2
3
4
5
6
7
0
1
2
3
0
1
6
7
4
5
0
1
1
3
4
5
6
7
0
1
2
3
2
1
0
7
6
5
4
1
0
0
4
5
6
7
0
1
2
3
4
5
6
7
0
1
2
3
1
0
1
5
6
7
0
1
2
3
4
5
4
7
6
1
0
3
2
1
1
0
6
7
0
1
2
3
4
5
6
7
4
5
2
3
0
1
1
1
1
7
0
1
2
3
4
5
6
7
6
5
4
3
2
1
0
PRELIMINARY
(May, 2005, Version 0.0)
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AMIC Technology, Corp.
A43L0616B
1. Power must be applied to either CKE and DQM inputs to
pull them high and other pins are NOP condition at the
inputs before or along with VDD (and VDDQ) supply.
The clock signal must also be asserted at the same time.
2. After VDD reaches the desired voltage, a minimum pause
of 200 microseconds is required with inputs in NOP
condition.
3. Both banks must be precharged now.
4. Perform a minimum of 2 Auto refresh cycles to stabilize the
internal circuitry.
5. Perform a MODE REGISTER SET cycle to program the
CAS latency, burst length and burst type as the default
value of mode register is undefined.
At the end of one clock cycle from the mode register set
cycle, the device is ready for operation.
When the above sequence is used for Power-up, all the
out-puts will be in high impedance state. The high
impedance of outputs is not guaranteed in any other
power-up sequence.
cf.) Sequence of 4 & 5 may be changed.
Device Operations
Clock (CLK)
The clock input is used as the reference for all SDRAM
operations. All operations are synchronized to the positive
going edge of the clock. The clock transitions must be
monotonic between VIL and VIH. During operation with CKE
high all inputs are assumed to be in valid state (low or high)
for the duration of set up and hold time around positive edge
of the clock for proper functionality and ICC specifications.
Clock Enable (CLK)
The clock enable (CKE) gates the clock onto SDRAM. If CKE
goes low synchronously with clock (set-up and hold time
same as other inputs), the internal clock is suspended form
the next clock cycle and the state of output and burst address
is frozen as long as the CKE remains low. All other inputs are
ignored from the next clock cycle after CKE goes low. When
both banks are in the idle state and CKE goes low
synchronously with clock, the SDRAM enters the power down
mode form the next clock cycle. The SDRAM remains in the
power down mode ignoring the other inputs as long as CKE
remains low. The power down exit is synchronous as the
internal clock is suspended. When CKE goes high at least
“tSS + 1 CLOCK” before the high going edge of the clock, then
the SDRAM becomes active from the same clock edge
accepting all the input commands.
Mode Register Set (MRS)
The mode register stores the data for controlling the various
operation modes of SDRAM. It programs the CAS latency,
addressing mode, burst length, test mode and various vendor
specific options to make SDRAM useful for variety of different
applications. The default value of the mode register is not
defined, therefore the mode register must be written after
power up to operate the SDRAM. The mode register is
written by asserting low on CS , RAS , CAS , WE (The
SDRAM should be in active mode with CKE already high
prior to writing the mode register). The state of address pins
A0~A10/AP
and
BA
in
the
same
cycle
as
CS , RAS , CAS , WE going low is the data written in the
mode register. One clock cycle is required to complete the
write in the mode register. The mode register contents can
be changed using the same command and clock cycle
requirements during operation as long as both banks are in
the idle state. The mode register is divided into various fields
depending on functionality. The burst length field uses
A0~A2, burst type uses A3, addressing mode uses A4~A6,
A7~A8, A10/AP and BA are used for vendor specific options
or test mode. And the write burst length is programmed using
A9. A7~A8, A10/AP and BA must be set to low for normal
SDRAM operation.
Refer to table for specific codes for various burst length,
addressing modes and CAS latencies.
Bank Select (BA)
This SDRAM is organized as two independent banks of
524,288 words X 16 bits memory arrays. The BA inputs is
latched at the time of assertion of RAS and CAS to select
the bank to be used for the operation. When BA is asserted
low, bank A is selected. When BA is asserted high, bank B is
selected. The bank select BA is latched at bank activate,
read, write mode register set and precharge operations.
Address Input (A0 ~ A10/AP)
The 19 address bits required to decode the 524,288 word
locations are multiplexed into 11 address input pins
(A0~A10/AP). The 11 bit row address is latched along with
RAS and BA during bank activate command. The 8 bit
column address is latched along with CAS , WE and BA
during read or write command.
NOP and Device Deselect
Bank Activate
When RAS , CAS and WE are high, the SDRAM performs
no operation (NOP). NOP does not initiate any new
operation, but is needed to complete operations which
require more than single clock like bank activate, burst read,
auto refresh, etc. The device deselect is also a NOP and is
entered by asserting CS high. CS high disables the
The bank activate command is used to select a random row
in an idle bank. By asserting low on RAS and CS with
desired row and bank addresses, a row access is initiated.
The read or write operation can occur after a time delay of
tRCD(min) from the time of bank activation. tRCD(min) is an
internal timing parameter of SDRAM, therefore it is
dependent on operating clock frequency. The minimum
number of clock cycles required between bank activate and
read or write command should be calculated by dividing
tRCD(min) with cycle time of the clock and then rounding off
the result to the next higher integer. The SDRAM has two
internal banks on the same chip and shares part of the
internal circuitry to reduce chip area, therefore it restricts the
command decoder so that RAS , CAS and WE , and all the
address inputs are ignored.
Power-Up
The following sequence is recommended for POWER UP
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activation of both banks immediately. Also the noise
generated during sensing of each bank of SDRAM is high
requiring some time for power supplies recover before the
other bank can be sensed reliably. tRRD(min) specifies the
minimum time required between activating different banks.
The number of clock cycles required between different bank
activation must be calculated similar to tRCD specification. The
minimum time required for the bank to be active to initiate
sensing and restoring the complete row of dynamic cells is
determined by tRAS(min) specification before a precharge
command to that active bank can be asserted. The maximum
time any bank can be in the active state is determined by
tRAS(max). The number of cycles for both tRAS(min) and
tRAS(max) can be calculated similar to tRCD specification.
DQM and zero cycle for write, which means DQM masking
occurs two cycles later in the read cycle and occurs in the
same cycle during write cycle. DQM operation is
synchronous with the clock, therefore the masking occurs for
a complete cycle. The DQM signal is important during burst
interrupts of write with read or precharge in the SDRAM. Due
to asynchronous nature of the internal write, the DQM
operation is critical to avoid unwanted or incomplete writes
when the complete burst write is not required.
Precharge
The precharge operation is performed on an active bank by
asserting low on CS , RAS , WE and A10/AP with valid BA
of the bank to be precharged. The precharge command can
be asserted anytime after tRAS(min) is satisfied from the bank
activate command in the desired bank. “tRP” is defined as the
minimum time required to precharge a bank.
The minimum number of clock cycles required to complete
row precharge is calculated by dividing “tRP” with clock cycle
time and rounding up to the next higher integer. Care should
be taken to make sure that burst write is completed or DQM
is used to inhibit writing before precharge command is
asserted. The maximum time any bank can be active is
specified by tRAS(max). Therefore, each bank has to be
precharged within tRAS(max) from the bank activate
command. At the end of precharge, the bank enters the idle
state and is ready to be activated again.
Entry to Power Down, Auto refresh, Self refresh and Mode
register Set etc, is possible only when both banks are in idle
state.
Burst Read
The burst read command is used to access burst of data on
consecutive clock cycles from an active row in an active
bank. The burst read command is issued by asserting low on
CS and CAS with WE being high on the positive edge of
the clock. The bank must be active for at least tRCD(min)
before the burst read command is issued. The first output
appears CAS latency number of clock cycles after the issue
of burst read command. The burst length, burst sequence
and latency from the burst read command is determined by
the mode register which is already programmed. The burst
read can be initiated on any column address of the active
row. The address wraps around if the initial address does not
start from a boundary such that number of outputs from each
I/O are equal to the burst length programmed in the mode
register. The output goes into high-impedance at the end of
the burst, unless a new burst read was initiated to keep the
data output gapless. The burst read can be terminated by
issuing another burst read or burst write in the same bank or
the other active bank or a precharge command to the same
bank. The burst stop command is valid at every page burst
length.
Auto Precharge
The precharge operation can also be performed by using
auto precharge. The SDRAM internally generates the timing
to satisfy tRAS(min) and “tRP” for the programmed burst length
and CAS latency. The auto precharge command is issued at
the same time as burst read or burst write by asserting high
on A10/AP. If burst read or burst write command is issued
with low on A10/AP, the bank is left active until a new
command is asserted. Once auto precharge command is
given, no new commands are possible to that particular bank
until the bank achieves idle state.
Burst Write
The burst write command is similar to burst read command,
and is used to write data into the SDRAM consecutive clock
cycles in adjacent addresses depending on burst length and
burst sequence. By asserting low on CS , CAS and WE with
valid column address, a write burst is initiated. The data
inputs are provided for the initial address in the same clock
cycle as the burst write command. The input buffer is
deselected at the end of the burst length, even though the
internal writing may not have been completed yet. The writing
can not complete to burst length. The burst write can be
terminated by issuing a burst read and DQM for blocking
data inputs or burst write in the same or the other active
bank. The burst stop command is valid only at full page burst
length where the writing continues at the end of burst and the
burst is wrap around. The write burst can also be terminated
by using DQM for blocking data and precharging the bank
“tRDL” after the last data input to be written into the active row.
See DQM OPERATION also.
Both Banks Precharge
Both banks can be precharged at the same time by using
Precharge all command. Asserting low on CS , RAS and
WE with high on A10/AP after both banks have satisfied
tRAS(min) requirement, performs precharge on both banks. At
the end of tRP after performing precharge all, both banks are
in idle state.
Auto Refresh
The storage cells of SDRAM need to be refreshed every
32ms to maintain data. An auto refresh cycle accomplishes
refresh of a single row of storage cells. The internal counter
increments automatically on every auto refresh cycle to
refresh all the rows. An auto refresh command is issued by
asserting low on CS , RAS and CAS with high on CKE and
DQM Operation
The DQM is used to mask input and output operation. It
works similar to OE during read operation and inhibits writing
during write operation. The read latency is two cycles from
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WE . The auto refresh command can only be asserted with
both banks being in idle state and the device is not in power
down mode (CKE is high in the previous cycle). The time
required to complete the auto refresh operation is specified
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the input buffers except CKE. The refresh addressing and
timing is internally generated to reduce power consumption.
The self refresh mode is entered from all banks idle state by
asserting low on CS , RAS , CAS and CKE with high on
WE . Once the self refresh mode is entered, only CKE state
being low matters, all the other inputs including clock are
ignored to remain in the self refresh.
The self refresh is exited by restarting the external clock and
then asserting high on CKE. This must be followed by NOP’s
for a minimum time of “tRC” before the SDRAM reaches idle
state to begin normal operation. If the system uses burst auto
refresh during normal operation, it is recommended to used
burst 2048 auto refresh cycles immediately after exiting self
refresh.
by “tRC(min)”. The minimum number of clock cycles required
can be calculated by driving “tRC” with clock cycle time and
then rounding up to the next higher integer. The auto refresh
command must be followed by NOP’s until the auto refresh
operation is completed. Both banks will be in the idle state at
the end of auto refresh operation. The auto refresh is the
preferred refresh mode when the SDRAM is being used for
normal data transactions. The auto refresh cycle can be
performed once in 15.6us or a burst of 2048 auto refresh
cycles once in 32ms.
Self Refresh
The self refresh is another refresh mode available in the
SDRAM. The self refresh is the preferred refresh mode for
data retention and low power operation of SDRAM. In self
refresh mode, the SDRAM disables the internal clock and all
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Basic feature And Function Descriptions
1. CLOCK Suspend
1) Click Suspended During Write (BL=4)
2) Clock Suspended During Read (BL=4)
CLK
CMD
WR
RD
CKE
Masked by CKE
Masked by CKE
Internal
CLK
DQ(CL2)
D0
D1
DQ(CL3)
D0
D1
D2
D3
D2
D3
Q0
Q1
Q2
Q0
Q1
Not Written
Q3
Q2
Q3
Suspended Dout
Note: CLK to CLK disable/enable=1 clock
2. DQM Operation
2) Read Mask (BL=4)
1) Write Mask (BL=4)
CLK
CMD
WR
RD
DQM
Masked by CKE
D0
DQ(CL2)
DQ(CL3)
D0
D1
D1
Masked by CKE
D3
Q0
Hi-Z
Hi-Z
D3
DQM to Data-in Mask = 0CLK
Q1
Q3
Q1
Q2
Q3
DQM to Data-out Mask = 2
2) Read Mask (BL=4)
CLK
CMD
RD
CKE
DQM
Q0
DQ(CL2)
Hi-Z
Hi-Z
DQ(CL3)
Q2
Q1
Hi-Z
Hi-Z
Q4
Q3
Hi-Z
Hi-Z
Q6
Q7
Q8
Q5
Q6
Q7
* Note : 1. DQM makes data out Hi-Z after 2 clocks which should masked by CKE “L”.
2. DQM masks both data-in and data-out.
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3. CAS Interrupt (I)
1) Read interrupted by Read (BL=4)Note 1
CLK
CMD
RD
ADD
A
RD
B
QA0
DQ(CL2)
DQ(CL3)
QB0
QB1 QB2
QB3
QA0
QB0
QB2
QB1
QB3
tCCD
Note2
2) Write interrupted by Write (BL =2)
3) Write interrupted by Read (BL =2)
CLK
CMD
WR
ADD
A
DQ
DA0
WR
tCCD
WR
tCCD
Note2
B
DB0
RD
A
DB1
tCDL
Note3
Note2
B
DQ(CL2)
DA0
DQ(CL3)
DA0
QB0
QB1
QB0
QB1
tCDL
Note3
Note : 1. By “Interrupt”, It is possible to stop burst read/write by external command before the end of burst.
By “ CAS Interrupt”, to stop burst read/write by CAS access; read, write and block write.
2. tCCD : CAS to CAS delay. (=1CLK)
3. tCDL : Last data in to new column address delay. (= 1CLK).
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4. CAS Interrupt (II) : Read Interrupted Write & DQM
(1) CL=2, BL=4
CLK
i) CMD
RD
WR
DQM
D0
DQ
ii) CMD
Hi-Z
DQ
D0
RD
iii) CMD
D3
D1
D2
D3
D1
D2
D3
D1
D2
WR
DQM
Hi-Z
D0
DQ
iv) CMD
D2
WR
RD
DQM
D1
RD
WR
DQM
Q0
DQ
Hi-Z
Note 1
D0
D3
(2) CL=3, BL=4
CLK
i) CMD
RD
WR
DQM
D0
DQ
ii) CMD
RD
D1
D2
D3
D1
D2
D3
D1
D2
D3
D1
D2
D3
D1
D2
WR
DQM
DQ
D0
RD
iii) CMD
WR
DQM
D0
WR
DQ
iv) CMD
RD
WR
DQM
Hi-Z
DQ
v) CMD
D0
RD
WR
DQM
DQ
Q0
Hi-Z
Note 2
D0
D3
* Note : 1. To prevent bus contention, there should be at least one gap between data in and data out.
2. To prevent bus contention, DQM should be issued which makes a least one gap between data in and data out.
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5. Write Interrupted by Precharge & DQM
CLK
CMD
Note 2
WR
PRE
Note 1
DQM
DQ
D0
D1
D2
D3
Masked by DQM
Note : 1. To inhibit invalid write, DQM should be issued.
2. This precharge command and burst write command should be of the same bank, otherwise it is not precharge
interrupt but only another bank precharge of dual banks operation.
6. Precharge
1) Normal Write (BL=4)
CLK
CMD
WR
DQ
D0
PRE
D1
D2
D3
tRDL
2) Read (BL=4)
CLK
CMD
RD
PRE
DQ(CL2)
Q0
DQ(CL3)
Q1
Q2
Q3
Q0
Q1
Q2
Q3
7. Auto Precharge
1) Normal Write (BL=4)
CLK
CMD
WR
DQ
D0
D1
D2
D3
Note 1
Auto Precharge Starts
2) Read (BL=4)
CLK
CMD
DQ(CL2)
RD
Q0
DQ(CL3)
Q1
Q2
Q3
Q0
Q1
Q2
Q3
Note 1
Auto Precharge Starts
* Note : 1. The row active command of the precharge bank can be issued after tRP from this point.
The new read/write command of other active bank can be issued from this point.
At burst read/write with auto precharge, CAS interrupt of the same/another bank is illegal.
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8. Burst Stop & Precharge Interrupt
2) Write Burst Stop (BL=8)
1) Write Interrupted by Precharge (BL=4)
CLK
CLK
CMD
WR
PRE
CMD
WR
D3
DQ
D0
STOP
DQM
DQ
D0
D1
D2
tRDL
D2
Note 1
tBDL (note 2)
3) Read Interrupted by Precharge (BL=4)
4) Read Burst Stop (BL=4)
CLK
CMD
D1
CLK
RD
PRE
Q0
DQ(CL2)
DQ(CL3)
CMD
Note 3
Q1
1
DQ(CL2)
Q0
Q1
MRS
ACT
2
DQ(CL3)
RD
STOP
Q0
Note 3
Q1
Q0
1
Q1
2
9. MRS
Mode Register Set
CLK
Note 4
CMD
PRE
tRP
1CLK
Note : 1. tRDL : 2CLK, Last Data in to Row Precharge.
2. tBDL : 1CLK, Last Data in to Burst Stop Delay.
3. Number of valid output data after Row precharge or burst stop : 1,2 for CAS latency=2,3 respectively.
4. PRE : Both banks precharge if necessary.
MRS can be issued only at all bank precharge state.
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10. Clock Suspend Exit & Power Down Exit
1) Clock Suspend (=Active Power Down) Exit
2) Power Down (=Precharge Power Down) Exit
CLK
CLK
CKE
Internal
CLK
CKE
tSS
tSS
Internal
CLK
Note 1
RD
CMD
Note 2
NOP
CMD
ACT
11. Auto Refresh & Self Refresh
Note 3
1) Auto Refresh
CKE
~
CLK
Note 4
Note 5
PRE
AR
CMD
~ ~
~
Internal
CLK
CMD
tRP
tRC
Note 6
~
2) Self Refresh
~
CLK
Note 4
PRE
SR
CMD
~
CMD
~
~
CKE
tRP
tRC
* Note : 1. Active power down : one or more bank active state.
2. Precharge power down : both bank precharge state.
3. The auto refresh is the same as CBR refresh of conventional DRAM.
No precharge commands are required after Auto Refresh command.
During tRC from auto refresh command, any other command can not be accepted.
4. Before executing auto/self refresh command, both banks must be idle state.
5. MRS, Bank Active, Auto/Self Refresh, Power Down Mode Entry.
6. During self refresh mode, refresh interval and refresh operation are performed internally.
After self refresh entry, self refresh mode is kept while CKE is LOW.
During self refresh mode, all inputs expect CKE will be don’t cared, and outputs will be in Hi-Z state.
During tRC from self refresh exit command, any other command can not be accepted.
Before/After self refresh mode, burst auto refresh cycle (2K cycles ) is recommended.
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12. About Burst Type Control
Basic
MODE
Sequential counting
Interleave counting
PseudoDecrement Sequential
Counting
PseudoMODE
Pseudo-Binary Counting
Random
MODE
Random column Access
tCCD = 1 CLK
At MRS A3=”0”. See the BURST SEQUENCE TABE.(BL=4,8)
BL=1,2,4,8 and full page wrap around.
At MRS A3=” 1”. See the BURST SEQUENCE TABE.(BL=4,8)
BL=4,8 At BL=1,2 Interleave Counting = Sequential Counting
At MRS A3 = “1”. (See to Interleave Counting Mode)
Starting Address LSB 3 bits A0-2 should be “000” or “111”[email protected]=8.
--if LSB = “000” : Increment Counting.
--if LSB= “111” : Decrement Counting.
For Example, (Assume Addresses except LSB 3 bits are all 0, BL=8)
[email protected] write, LSB=”000”, Accessed Column in order 0-1-2-3-4-5-6-7
[email protected] read, LSB=”111”, Accessed Column in order 7-6-5-4-3-2-1-0
At BL=4, same applications are possible. As above example, at Interleave Counting
mode, by confining starting address to some values, Pseudo-Decrement Counting
Mode can be realized. See the BURST SEQUENCE TABLE carefully.
At MRS A3 = “0”. (See to Sequential Counting Mode)
A0-2 = “111”. (See to Full Page Mode)
Using Full Page Mode and Burst Stop Command, Binary Counting Mode can be
realized.
[email protected] Sequential Counting Accessed Column in order 3-4-5-6-7-1-2-3 (BL=8)
[email protected] Pseudo-Binary Counting,
Accessed Column in order 3-4-5-6-7-8-9-10 (Burst Stop command)
Note. The next column address of 256 is 0
Every cycle Read/Write Command with random column address can realize
Random Column Access.
That is similar to Extended Data Out (EDO) Operation of convention DRAM.
13. About Burst Length Control
At MRS A2,1,0 = “000”.
At auto precharge, tRAS should not be violated.
At MRS A2,1,0 = “001”.
2
At auto precharge, tRAS should not be violated.
4
At MRS A2,1,0 = “010”
8
At MRS A2,1,0 = “011”.
At MRS A2,1,0 = “111”.
Full Page
Wrap around mode (Infinite burst length) should be stopped by burst stop,
RAS interrupt or CAS interrupt.
At MRS A9=”1”.
BRSW
Read burst = 1,2,4,8, full page/write Burst =1
At auto precharge of write, tRAS should not be violated.
tBDL=1, Valid DQ after burst stop is 1,2 for CL=2,3 respectively
Burst Stop
Using burst stop command, it is possible only at full page burst length.
Before the end of burst, Row precharge command of the same bank
RAS Interrupt
Stops read/write burst with Row precharge.
(Interrupted by Precharge) tRDL=2 with DQM, valid DQ after burst stop is 1,2 for CL=2,3 respectively
During read/write burst with auto precharge, RAS interrupt cannot be issued.
Before the end of burst, new read/write stops read/write burst and starts new
read/write burst or block write.
CAS Interrupt
During read/write burst with auto precharge, CAS interrupt can not be issued.
1
Basic
MODE
Special
MODE
Random
MODE
Interrupt
MODE
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Power On Sequence & Auto Refresh
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
CLOCK
CS
tRP
tRC
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
A10/AP
~
~
BA
~
~
ADDR
~
~
CAS
~
~
~
~
RAS
KEY
Ra
KEY
BS
KEY
Ra
~
~
~
~
~
~
~
~
~
~
~
~
WE
High-Z
DQ
Precharge
(All Banks)
Auto Refresh
~
~
High level is necessary
~
~
DQM
~
~
High level is necessary
~
~
CKE
Auto Refresh
Mode Regiser Set
Row Active
(A-Bank)
: Don't care
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Single Bit Read-Write-Read Cycles (Same Page) @CAS Latency=3, Burst Length=1
tCH
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
CLOCK
tCL
tCC
High
CKE
tRAS
tRC
tSH
*Note 1
CS
tSS
tRCD
tRP
tSH
RAS
tSS
tCCD
tSH
CAS
tSS
tSH
ADDR
tSS
Ra
Ca
Cb
tSS
Cc
Rb
tSH
*Note 2,3
*Note 2
BA
BS
A10/AP
Ra
*Note 2,3
*Note 2,3
BS
BS
BS
*Note 3
*Note 3
*Note 3
*Note 4
*Note 2
BS
BS
*Note 4
Rb
tSH
WE
tSS
tSS
tSH
DQM
tRAC
tSH
tSAC
Qa
DQ
tSLZ
tOH
Row Active
Read
Db
Qc
tSS
tSHZ
Write
Read
Row Active
Precharge
: Don't care
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* Note : 1. All inputs can be don’t care when CS is high at the CLK high going edge.
2. Bank active & read/write are controlled by BA.
BA
Active & Read/Write
0
Bank A
1
Bank B
3. Enable and disable auto precharge function are controlled by A10/AP in read/write command.
A10/AP
0
1
BA
Operation
0
Disable auto precharge, leave bank A active at end of burst.
1
Disable auto precharge, leave bank B active at end of burst.
0
Enable auto precharge, precharge bank A at end of burst.
1
Enable auto precharge, precharge bank B at end of burst.
4. A10/AP and BA control bank precharge when precharge command is asserted.
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A10/AP
BA
Precharge
0
0
Bank A
0
1
Bank B
1
X
Both Bank
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Read & Write Cycle at Same Bank @Burst Length=4
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
CLOCK
High
CKE
tRC
*Note 1
CS
tRCD
RAS
*Note 2
CAS
ADDR
Ra
Ca0
Rb
Cb0
BA
A10/AP
Ra
Rb
WE
DQM
tOH
DQ
(CL = 2)
Qa0
tRAC
*Note 3
Qa1
Qa2
tSAC
Qa3
Db0
Db1
*Note 4
tSHZ
Db2
Db3
tRDL
tOH
DQ
(CL = 3)
Qa0
tRAC
*Note 3
Row Active
(A-Bank)
Qa1
Qa3
tSHZ
tSAC
Read
(A-Bank)
Qa2
Precharge
(A-Bank)
Db0
*Note 4
Row Active
(A-Bank)
Db1
Db2
Db3
tRDL
Write
(A-Bank)
Precharge
(A-Bank)
: Don't care
*Note : 1. Minimum row cycle times is required to complete internal DRAM operation.
2. Row precharge can interrupt burst on any cycle. [CAS latency-1] valid output data available after Row
enters precharge. Last valid output will be Hi-Z after tSHZ from the clock.
3. Access time from Row address. tCC*(tRCD + CAS latency-1) + tSAC
4. Output will be Hi-Z after the end of burst. (1,2,4 & 8)
At Full page bit burst, burst is wrap-around.
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Page Read & Write Cycle at Same Bank @Burst Length=4
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
CLOCK
High
CKE
CS
tRCD
RAS
*Note 2
CAS
ADDR
Ra
Ca0
Cb0
Cc0
Cd0
BA
A10/AP
Ra
tRDL
tCDL
WE
*Note 2
*Note1
*Note3
DQM
DQ
(CL=2)
Qa0
DQ
(CL=3)
Row Active
(A-Bank)
Read
(A-Bank)
Qa1
Qb0
Qb1
Dc0
Dc1
Dd0
Dd1
Qa0
Qa1
Qb0
Dc0
Dc1
Dd0
Dd1
Write
(A-Bank)
Read
(A-Bank)
Write
(A-Bank)
Precharge
(A-Bank)
: Don't care
*Note : 1. To write data before burst read ends, DQM should be asserted three cycle prior to write command to avoid bus contention.
2. Row precharge will interrupt writing. Last data input, tRDL before Row precharge, will be written.
3. DQM should mask invalid input data on precharge command cycle when asserting precharge before end of burst. Input data
after Row precharge cycle will be masked internally.
PRELIMINARY
(May, 2005, Version 0.0)
26
AMIC Technology, Corp.
A43L0616B
Page Read Cycle at Different Bank @Burst Length = 4
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
CLOCK
CKE
High
*Note 1
CS
RAS
*Note 2
CAS
ADDR
RAa
CAa
RBb
CBb
CAc
CBd
CAe
BA
A10/AP
RAa
RBb
WE
DQM
DQ
(CL=2)
QAa0 QAa1 QAa2 QAa3 QBb0 QBb1 QBb2 QBb3 QAc0 QAc1 QBd0 QBd1 QAe0 QAe1
DQ
(CL=3)
QAa0 QAa1 QAa2 QAa3 QBb0 QBb1 QBb2 QBb3 QAc0 QAc1 QBd0 QBd1 QAe0 QAe1
Row Active
(A-Bank)
Row Active
(B-Bank)
Read
(A-Bank)
Read
(B-Bank)
Read
(B-Bank)
Read
(A-Bank)
Precharge
(A-Bank)
Read
(A-Bank)
: Don't care
* Note : 1. CS can be don’t care when RAS, CAS and
WE
are high at the clock high going edge.
2. To interrupt a burst read by row precharge, both the read ad the precharge banks must be the same.
PRELIMINARY
(May, 2005, Version 0.0)
27
AMIC Technology, Corp.
A43L0616B
Page Write Cycle at Different Bank @Burst Length=4
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
CLOCK
CKE
High
CS
RAS
*Note 2
CAS
ADDR
RAa
CAa
RBb
CBb
CAc
DBb0 DBb1 DBb2 DBb3
DAc0
CBd
BA
A10/AP
RAa
RBb
DAa0 DAa1
DQ
DAa2
DAa3
DAc1
DBd0 DBd1
tRDL
tCDL
WE
*Note 1
DQM
Row Active
(B-Bank)
Row Active with
(A-Bank)
Write
(B-Bank)
Precharge
(Both Banks)
Write
(A-Bank)
Write
(A-Bank)
Write
(B-Bank)
: Don't care
* Note:
1. To interrupt burst write by Row precharge, DQM should be asserted to mask invalid input data.
2. To interrupt burst write by Row precharge, both the write and precharge banks must be the same.
PRELIMINARY
(May, 2005, Version 0.0)
28
AMIC Technology, Corp.
A43L0616B
Read & Write Cycle at Different Bank @Burst Length=4
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
CLOCK
CKE
High
CS
RAS
CAS
ADDR
RAa
CAa
RBb
CBb
RAc
CAc
BA
A10/AP
RAa
RBb
RAc
tCDL
*Note 1
WE
DQM
DQ
(CL=2)
QAa0
DQ
(CL=3)
Row Active
(A-Bank)
QAa1 QAa2 QAa3
DBb0 DBb1 DBb2 DBb3
QAc0 QAc1 QAc2
QAa0 QAa1 QAa2 QAa3
DBb0 DBb1 DBb2 DBb3
QAc0 QAc1
Read
(A-Bank)
Precharge
(A-Bank)
Write
(B-Bank)
Row Active
(B-Bank)
Read
(A-Bank)
Row Active
(A-Bank)
: Don't care
* Note : tCDL should be met to complete write.
PRELIMINARY
(May, 2005, Version 0.0)
29
AMIC Technology, Corp.
A43L0616B
Read & Write Cycle with Auto Precharge I @Burst Length=4
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
CLOCK
CKE
High
CS
RAS
CAS
ADDR
RAa
RBb
RAa
RBb
CAa
CBb
BA
A10/AP
WE
DQM
DQ
(CL=2)
QAa0
DQ
(CL=3)
Row Active
(A-Bank)
Read with
Auto Precharge
(A-Bank)
QAa1
QAa2 QAa3
QAa0
QAa1 QAa2
Auto Precharge
Start Point
(A-Bank)
QAa3
DBb0
DBb1
DBb2
DBb3
DBb0
DBb1
DBb2
DBb3
Write with
Auto Precharge
(B-Bank)
Auto Precharge
Start Point
(B-Bank)
Row Active
(B-Bank)
: Don't care
*Note : tRCD should be controlled to meet minimum tRAS before internal precharge start.
(In the case of Burst Length=1 & 2, BRSW mode)
PRELIMINARY
(May, 2005, Version 0.0)
30
AMIC Technology, Corp.
A43L0616B
Read & Write Cycle with Auto Precharge II @Burst Length=4
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
CLOCK
CKE
High
CS
RAS
CAS
ADDR
Ra
Rb
Ra
Rb
Ca
Cb
Ra
Ca
BA
A10/AP
Ra
WE
DQM
Qa0
DQ
(CL=2)
DQ
(CL=3)
Row Active
(A-Bank)
Read with
Auto Pre
Charge
(A-Bank)
Qa1
Qb0
Qb1
Qb2
Qb3
Qa0
Qa1
Qb0
Qb1
Qb2
Read without
Auto Precharge
(B-Bank)
Auto Precharge
Strart Point
(A-Bank) *Note 1
Precharge
(B-Bank)
Qb3
Row Active
(A-Bank)
Da0
Da1
Da0
Da1
Write with
Auto Precharge
(A-Bank)
Row Active
(B-Bank)
: Don't care
* Note :
When Read(Write) command with auto precharge is issued at A-Bank after A and B Bank activation.
- if read(Write) command without auto precharge is issued at B-Bank before A Bank auto precharge starts, A Bank auto
precharge will start at B Bank read command input point.
- Any command can not be issued at A Bank during tRP after A Bank auto precharge starts.
PRELIMINARY
(May, 2005, Version 0.0)
31
AMIC Technology, Corp.
A43L0616B
Read & Write Cycle with Auto Precharge III @Burst Length=4
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
CLOCK
CKE
High
CS
RAS
CAS
ADDR
Ra
Ca
Rb
Cb
BA
A10/AP
Ra
Rb
WE
DQM
DQ
(CL=2)
Qa0
DQ
(CL=3)
Qa1
Qa2
Qa3
Qa0
Qa1
Qa2
Qb0
Qa3
Qb1
Qb2
Qb3
Qb0
Qb1
Db2
Db3
* Note 1
Row Active
(A-Bank)
Read with
Auto Preharge
(A-Bank)
Auto Precharge Read with
Start Point Auto Precharge
(B-Bank)
(A-Bank)
Row Active
(B-Bank)
Auto Precharge
Start Point
(B-Bank)
: Don't care
* Note : Any command to A-bank is not allowed in this period.
tRP is determined from at auto precharge start point
PRELIMINARY
(May, 2005, Version 0.0)
32
AMIC Technology, Corp.
A43L0616B
Read Interrupted by Precharge Command & Read Burst Stop Cycle (@Burst Length = Full Page)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
CLOCK
CKE
High
CS
RAS
CAS
ADDR
RAa
CAa
CAb
BA
* Note 1
A10/AP
* Note 1
RAa
WE
DQM
* Note 2
DQ
(CL=2)
QAa0 QAa1
DQ
(CL=3)
QAa0
1
1
QAa2 QAa3 QAa4
QAb0 QAb1 QAb2 QAb3 QAb4 QAb5
2
Row Active
(A-Bank)
Read
(A-Bank)
QAa1 QAa2 QAa3 QAa4
Burst Stop
2
QAb0 QAb1 QAb2 QAb3
Read
(A-Bank)
QAb4 QAb5
Precharge
(A-Bank)
: Don't care
* Note : 1. At full page mode, burst is wrap-around at the end of burst. So auto precharge is impossible.
2. About the valid DQ’s after burst stop, it is same as the case of RAS interrupt.
Both cases are illustrated above timing diagram. See the label 1,2 on them.
But at burst write, burst stop and RAS interrupt should be compared carefully.
Refer the timing diagram of “Full page write burst stop cycle”.
3. Burst stop is valid at every burst length.
PRELIMINARY
(May, 2005, Version 0.0)
33
AMIC Technology, Corp.
A43L0616B
Write Interrupted by Precharge Command & Write Burst Stop Cycle (@ Burst Length = Full Page)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
CLOCK
CKE
High
CS
RAS
CAS
ADDR
RAa
CAa
CAb
BA
* Note 1
A10/AP
* Note 1
RAa
tRDL
tBDL
WE
* Note 3
DQM
* Note 2
DAa0
DQ
Row Active
(A-Bank)
DAa1
DAa2
Write
(A-Bank)
DAa3 DAa4
DAb0
Burst Stop
DAb1
DAb2
DAb3
DAb4
DAb5
Write
(A-Bank)
Precharge
(A-Bank)
: Don't care
* Note : 1. At full page mode, burst is wrap-around at the end of burst. So auto precharge is impossible.
2. Data-in at the cycle of burst stop command cannot be written into corresponding memory cell.
It is defined by AC parameter of tBDL(=1CLK).
3. Data-in at the cycle of interrupted by precharge cannot be written into the corresponding memory cell.
It is defined by AC parameter of tRDL(=2CLK).
DQM at write interrupted by precharge command is needed to ensure tRDL of 2CLK.
DQM should mask invalid input data on precharge command cycle when asserting precharge before end of burst.
Input data after Row precharge cycle will be masked internally.
4. Burst stop is valid only at every burst length.
PRELIMINARY
(May, 2005, Version 0.0)
34
AMIC Technology, Corp.
A43L0616B
Burst Read Single Bit Write Cycle @Burst Length=2, BRSW
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
CLOCK
CKE
High
CS
RAS
* Note 2
CAS
ADDR
RAa
CAa
RBb
RAc
CAb
CBc
CAd
BA
A10/AP
RBb
RAa
RAc
WE
DQM
DQ
(CL=2)
DAa0
DQ
(CL=3)
DAa0
Row Active
(A-Bank)
QAb0
QAb1
DBc0
QAb0 QAb1
DBc0
Row Active
(A-Bank)
Row Active
(B-Bank)
Write
(A-Bank)
QAd0
QAd1
QAd0
Read
(A-Bank)
QAd1
Precharge
(A-Bank)
Write with
Auto Precharge
(B-Bank)
Read with
Auto Precharge
(A-Bank)
: Don't care
* Note : 1. BRSW mode is enabled by setting A9 “High” at MRS (Mode Register Set).
At the BRSW Mode, the burst length at write is fixed to “1” regardless of programed burst length.
2. When BRSW write command with auto precharge is executed, keep it in mind that tRAS should not be violated.
Auto precharge is executed at the burst-end cycle, so in the case of BRSW write command,
The next cycle starts the precharge.
PRELIMINARY
(May, 2005, Version 0.0)
35
AMIC Technology, Corp.
A43L0616B
Clock Suspension & DQM Operation Cycle @CAS Latency = 2, Burst Length=4
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
CLOCK
CKE
CS
RAS
CAS
ADDR
Ra
Ca
Cc
Cb
BA
A10/AP
Ra
WE
* Note 1
DQM
Qa0
DQ
Qa1
Qa2
Qa3
tSHZ
Row Active
Read
Clock
Suspension
Qb0
Qb1
Dc0
Dc2
tSHZ
Read
Write
DQM
Read DQM
Write
Clock
Suspension
: Don't care
* Note : DQM needed to prevent bus contention.
PRELIMINARY
(May, 2005, Version 0.0)
36
AMIC Technology, Corp.
A43L0616B
Active/Precharge Power Down Mode @CAS Lantency=2, Burst Length=4
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
~
~
~
~
tSS
~
~
0
CLOCK
* Note 2
tSS
tSS
tSS
CKE
~
~
* Note 1
*Note 3
~
~
~
~
~
~
CS
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
Ra
~
~
ADDR
~
~
~
~
~
~
~
~
BA
~
~
~
~
Ra
~
~
A10/AP
Precharge
Power-down
Entry
~
~
~
~
~
~
~
~
~
~
~
~
~
~
DQ
~
~
DQM
~
~
~
~
WE
Ca
~
~
CAS
~
~
RAS
Precharge
Power-down
Exit
Row Active
Qa0
Read
Qa1
Qa2
Precharge
Active
Power-down
Exit
Active
Power-down
Entry
: Don't care
* Note : 1. All banks should be in idle state prior to entering precharge power down mode.
2. CKE should be set high at least “1CLK + tSS” prior to Row active command.
3. Cannot violate minimum refresh specification. (32ms)
PRELIMINARY
(May, 2005, Version 0.0)
37
AMIC Technology, Corp.
A43L0616B
Self Refresh Entry & Exit Cycle
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
~
~
* Note 4
tSS
CKE
* Note 1
tRC min.
~
~
* Note 2
~
~
~
~
CLOCK
* Note 6
~
~
* Note 3
~
~
~
~
tSS
* Note 5
~
~
~
~
* Note 7
~
~
RAS
~
~
~
~
CS
~
~
~
~
~
~
~
~
CAS
~
~
~
~
~
~
~
~
ADDR
~
~
~
~
~
~
~
~
BA
~
~
~
~
~
~
~
~
A10/AP
~
~
~
~
~
~
~
~
WE
Hi-Z
~
~
~
~
DQ
~
~
~
~
~
~
~
~
DQM
* Note 7
Hi-Z
Self Refresh Exit
Self Refresh Entry
Auto Refresh
: Don't care
* Note : TO ENTER SELF REFRESH MODE
1. CS , RAS & CAS with CKE should be low at the same clock cycle.
2. After 1 clock cycle, all the inputs including the system clock can be don’t care except for CKE.
3. The device remains in self refresh mode as long as CKE stays “Low”.
(cf.) Once the device enters self refresh mode, minimum tRAS is required before exit from self refresh.
TO EXIT SELF REFRESH MODE
4. System clock restart and be stable before returning CKE high.
5. CS starts from high.
6. Minimum tRC is required after CKE going high to complete self refresh exit.
7. 2K cycle of burst auto refresh is required before self refresh entry and after self refresh exit.
If the system uses burst refresh.
PRELIMINARY
(May, 2005, Version 0.0)
38
AMIC Technology, Corp.
A43L0616B
Mode Register Set Cycle
0
1
2
3
Auto Refresh Cycle
4
5
6
0
1
2
3
4
5
6
7
8
9
10
CKE
High
~
~
~
~
CLOCK
High
~
~
*Note 2
tRC
~
~
CS
~
~
~
~
RAS
~
~
* Note 1
~
~
CAS
~
~
* Note 3
Ra
~
~
Key
ADDR
~
~
~
~
WE
~
~
DQ
Hi-Z
Hi-Z
MRS
~
~
~
~
DQM
Auto Refresh
New Command
New
Command
: Don't care
* Both banks precharge should be completed before Mode Register Set cycle and auto refresh cycle.
MODE REGISTER SET CYCLE
* Note : 1. CS , RAS , CAS &
WE
activation at the same clock cycle with address key will set internal mode register.
2. Minimum 2 clock cycles should be met before new RAS activation.
3. Please refer to Mode Register Set table.
PRELIMINARY
(May, 2005, Version 0.0)
39
AMIC Technology, Corp.
A43L0616B
Function Truth Table (Table 1)
Current
State
IDLE
CS
RAS CAS
WE
BA
Address
Action
H
X
X
X
X
X
NOP
L
H
H
H
X
X
NOP
L
H
H
L
X
X
ILLEGAL
2
L
H
L
X
BA
CA, A10/AP ILLEGAL
2
L
L
H
H
BA
RA
Row Active; Latch Row Address
L
L
H
L
BA
PA
NOP
4
X
Auto Refresh or Self Refresh
5
Mode Register Access
5
L
L
L
H
L
L
L
L
X
H
X
X
X
X
X
NOP
OP Code
L
H
H
H
X
X
NOP
Row
L
H
H
L
X
X
ILLEGAL
Active
L
H
L
H
BA
CA,A10/AP Begin Read; Latch CA; Determine AP
L
H
L
L
BA
CA,A10/AP Begin Write; Latch CA; Determine AP
L
L
H
H
BA
RA
ILLEGAL
L
L
H
L
BA
PA
Precharge
Read
Write
Read with
Auto
Precharge
PRELIMINARY
Note
2
2
L
L
L
X
X
X
ILLEGAL
H
X
X
X
X
X
NOP(Continue Burst to End →Row Active)
L
H
H
H
X
X
NOP(Continue Burst to End →Row Active)
L
H
H
L
X
X
Term burst →Row Active
L
H
L
H
BA
L
H
L
L
BA
CA,AP
L
L
H
H
BA
CA,A10/AP Term burst; Begin Read; Latch CA; Determine AP
3
Term burst; Begin Write; Latch CA; Determine AP
3
RA
ILLEGAL
2
Term Burst; Precharge timing for Reads
3
L
L
H
L
BA
PA
L
L
L
X
X
X
ILLEGAL
H
X
X
X
X
X
NOP(Continue Burst to End→Row Active)
L
H
H
H
X
X
NOP(Continue Burst to End→Row Active)
L
H
H
L
X
X
ILLEGAL
L
H
L
H
BA
CA,A10/AP Term burst; Begin Read; Latch CA; Determine AP
3
L
H
L
L
BA
CA,A10/AP Term burst; Begin Read; Latch CA; Determine AP
3
L
L
H
H
BA
RA
L
L
H
L
BA
A10/AP
ILLEGAL
2
Term Burst; Precharge timing for Writes
3
L
L
L
X
X
X
ILLEGAL
H
X
X
X
X
X
NOP(Continue Burst to End→Precharge)
L
H
H
H
X
X
NOP(Continue Burst to End→Precharge)
L
H
H
L
X
X
ILLEGAL
L
H
L
H
BA
CA,A10/AP ILLEGAL
2
L
H
L
L
BA
CA,A10/AP ILLEGAL
2
L
L
H
X
BA
RA, PA
ILLEGAL
L
L
L
X
X
X
ILLEGAL
(May, 2005, Version 0.0)
40
2
AMIC Technology, Corp.
A43L0616B
Function Truth Table (Table 1, Continued)
Current
State
CS
RAS CAS
WE
BA
Address
Action
Note
H
X
X
X
X
X
NOP(Continue Burst to End→Precharge)
L
H
H
H
X
X
NOP(Continue Burst to End→Precharge)
Write with
L
H
H
L
X
X
ILLEGAL
Auto
L
H
L
H
BA
CA,A10/AP ILLEGAL
2
Precharge
L
H
L
L
BA
CA,A10/AP ILLEGAL
2
L
L
H
X
BA
Precharge
Row
Activating
Refreshing
RA, PA
ILLEGAL
L
L
L
X
X
X
ILLEGAL
H
X
X
X
X
X
2
NOP→Idle after tRP
L
H
H
H
X
X
NOP→Idle after tRP
L
H
H
L
X
X
ILLEGAL
L
H
L
X
BA
L
L
H
H
BA
RA
ILLEGAL
2
L
L
H
L
BA
PA
NOP→Idle after tRP
2
L
L
L
X
X
X
ILLEGAL
4
CA,A10/AP ILLEGAL
2
H
X
X
X
X
X
NOP→Row Active after tRCD
L
H
H
H
X
X
NOP→Row Active after tRCD
L
H
H
L
X
X
ILLEGAL
L
H
L
X
BA
L
L
H
H
BA
RA
ILLEGAL
2
L
L
H
L
BA
PA
ILLEGAL
2
L
L
L
X
X
X
ILLEGAL
2
CA,A10/AP ILLEGAL
H
X
X
X
X
X
NOP→Idle after tRC
L
H
H
X
X
X
NOP→Idle after tRC
L
H
L
X
X
X
ILLEGAL
L
L
H
X
X
X
ILLEGAL
L
L
L
X
X
X
ILLEGAL
Abbreviations
RA = Row Address
NOP = No Operation Command
BA = Bank Address
CA = Column Address
2
AP = Auto Precharge
PA = Precharge All
Note: 1. All entries assume that CKE was active (High) during the preceding clock cycle and the current clock cycle.
2. Illegal to bank in specified state : Function may be legal in the bank indicated by BA, depending on the state of that
bank.
3. Must satisfy bus contention, bus turn around, and/or write recovery requirements.
4. NOP to bank precharging or in idle state. May precharge bank indicated by BA (and PA).
5. Illegal if any banks is not idle.
PRELIMINARY
(May, 2005, Version 0.0)
41
AMIC Technology, Corp.
A43L0616B
Function Truth Table for CKE (Table 2)
Current
State
Self
Refresh
Both
Bank
Precharge
Power
Down
All
Banks
Idle
Any State
Other than
Listed
Above
CKE
n-1
H
CKE
n
X
L
L
CS
RAS CAS
WE
Address
Action
Note
X
X
X
X
X
INVALID
H
H
X
X
X
X
Exit Self Refresh→ABI after tRC
6
H
L
H
H
H
X
Exit Self Refresh→ABI after tRC
6
L
H
L
H
H
L
X
ILLEGAL
L
H
L
H
L
X
X
ILLEGAL
L
H
L
L
X
X
X
ILLEGAL
L
L
X
X
X
X
X
NOP(Maintain Self Refresh)
H
X
X
X
X
X
X
INVALID
L
H
H
X
X
X
X
Exit Power Down→ABI
7
L
H
L
H
H
H
X
Exit Power Down→ABI
7
L
H
L
H
H
L
X
ILLEGAL
L
H
L
H
L
X
X
ILLEGAL
L
H
L
L
X
X
X
ILLEGAL
L
L
X
X
X
X
X
NOP(Maintain Power Down Mode)
H
H
X
X
X
X
X
Refer to Table 1
H
L
H
X
X
X
X
Enter Power Down
8
H
L
L
H
H
H
X
Enter Power Down
8
H
L
L
H
H
L
X
ILLEGAL
H
L
L
H
L
X
X
ILLEGAL
H
L
L
L
H
X
X
ILLEGAL
H
L
L
L
L
H
X
Enter Self Refresh
H
L
L
L
L
L
X
ILLEGAL
8
L
L
X
X
X
X
X
NOP
H
H
X
X
X
X
X
Refer to Operations in Table 1
H
L
X
X
X
X
X
Begin Clock Suspend next cycle
9
L
H
X
X
X
X
X
Exit Clock Suspend next cycle
9
L
L
X
X
X
X
X
Maintain clock Suspend
Abbreviations : ABI = All Banks Idle
Note: 6. After CKE’s low to high transition to exit self refresh mode. And a time of tRC(min) has to be elapse after CKE’s low to
high transition to issue a new command.
7. CKE low to high transition is asynchronous as if restarts internal clock.
A minimum setup time “tSS + one clock” must be satisfied before any command other than exit.
8. Power-down and self refresh can be entered only from the all banks idle state.
9. Must be a legal command.
PRELIMINARY
(May, 2005, Version 0.0)
42
AMIC Technology, Corp.
A43L0616B
Ordering Information
Part No.
Cycle Time (ns)
A43L0616BV-6
6
A43L0616BV-7
A43L0616BV-7U
A43L0616BV-6F
A43L0616BV-7F
A43L0616BV-7UF
Clock Frequency (MHz)
Access Time
166 @ CL = 3
5.5 ns @ CL = 3
125 @ CL = 2
6.0 ns @ CL = 2
143 @ CL = 3
6.0 ns @ CL = 3
125 @ CL = 2
7.0 ns @ CL = 2
143 @ CL = 3
6.0 ns @ CL = 3
125 @ CL = 2
7.0 ns @ CL = 2
166 @ CL = 3
5.5 ns @ CL = 3
125 @ CL = 2
6.0 ns @ CL = 2
143 @ CL = 3
6.0 ns @ CL = 3
125 @ CL = 2
7.0 ns @ CL = 2
143 @ CL = 3
6.0 ns @ CL = 3
125 @ CL = 2
7.0 ns @ CL = 2
Package
50 TSOP (II)
7
50 TSOP (II)
7
50 TSOP (II)
6
50 Pb-Free TSOP (II)
7
50 Pb-Free TSOP (II)
7
50 Pb-Free TSOP (II)
Note: -F for Pb-Free.
-U is for industrial operating temperature range
PRELIMINARY
(May, 2005, Version 0.0)
43
AMIC Technology, Corp.
A43L0616B
Package Information
TSOP 50L (Type II) Outline Dimensions
unit: inches/mm
Detail "A"
26
50
R0.15 REF.
0.25
E
E1
R0.15 REF.
θ
L
L1
1
25
D
A1
e
D
b
A
A2
c
Detail "A"
0.1
Seating Plane
Dimensions in inches
Symbol
Min
Nom
Max
Dimensions in mm
Min
Nom
Max
1.20
A
-
-
0.047
-
-
A1
0.002
-
-
0.05
-
-
A2
0.037
0.040
0.041
0.95
1.016
1.05
b
0.012
-
0.018
0.30
-
0.45
c
0.005
-
0.008
0.12
-
0.21
D
0.821
0.825
0.829
20.855
20.955
21.055
E
0.455
0.463
0.471
11.56
11.76
11.96
E1
0.396
0.400
0.404
10.06
10.16
10.26
e
-
0.031
-
-
0.800
-
L
0.016
0.020
0.024
0.40
0.50
0.60
θ
0°
-
5°
0°
-
5°
Notes:
1. The maximum value of dimension D includes end flash.
2. Dimension E does not include resin fins.
3. Dimension S includes end flash.
PRELIMINARY
(May, 2005, Version 0.0)
44
AMIC Technology, Corp.