VML VG4632321AQ-7

Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Overview
The VG4632321A SGRAM is a high-speed CMOS synchronous graphic RAM containing 32M bits. It is
internally configured as a dual 512K x 32 DRAM with a synchronous interface (all signals are registered on
the positive edge of the clock signal, CLK). Each of the 512K x 32 bit bank is organized as 2048 rows by 256
columns by 32 bits. Read and write accesses to the SGRAM are burst oriented; accesses start at a selected
location and continue for a programmed number of locations in a programmed sequence. Accesses begin
with the registration of a BankActivate command which is then followed by a Read or Write command.
The VG4632321A provides for programmable Read or Write burst lengths of 1, 2, 4, 8, or full page, with
burst termination option. An Auto Precharge function may be enabled to provide a self-timed row precharge
that is initiated at the end of the burst sequence. The refresh functions, either Auto or Self Refresh are easy
to use. In addition, it features the write per bit and the masked block write functions.
By having a programmable Mode register and special mode register, the system can choose the best
suitable modes to maximize its performance. These devices are well suited for applications requiring high
memory bandwidth, and when combined with special graphics functions result in a device particularly well
suited to high performance graphics applications.
Pin Assignment (Top View)
DQ29
VSSQ
DQ30
DQ31
VSS
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
VDD
DQ0
DQ1
VSSQ
DQ2
50
49
48
47
76
75
74
73
72
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
-4.5/-5/-5.5/-6/-7
tCK
Clock Cycle time(min.)
4.5/5/5.5/6/7 ns
tRAS
Row Active time(min.)
40/40/40/42/42 ns
tAC
Access time from CLK(max.)
tRC
Row Cycle time(min.)
Document:
80
79
78
77
A7
A6
A5
A4
VSS
A10
NC
NC
NC
NC
NC
NC
NC
NC
NC
VDD
A3
A2
A1
A0
Key Specifications
VG4632321A
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
•
•
•
•
•
•
•
•
Fast access time from clock: 4.5/5/5.5/6/7ns
Fast clock rate: 222/200/183/166/143MHz
Fully synchronous operation
Internal pipelined architecture
Dual internal banks(512K x 32-bit x 2-bank)
Programmable Mode and Special Mode registers
- CAS Latency: 1, 2, or 3
- Burst Length: 1, 2, 4, 8, or full page
- Burst Type: interleaved or linear burst
- Burst Read Single Write
- Load Color or Mask register
Burst stop function
Individual byte controlled by DQM0-3
Block write and write-per-bit capability
Auto Refresh and Self Refresh
2048 refresh cycles/32ms
Single + 3.3V ± 0.3V power supply
Interface: LVTTL
JEDEC 100-pin Plastic QFP package
1
2
3
4
81
82
83
84
•
•
•
•
•
•
DQ3
VDDQ
DQ4
DQ5
VSSQ
DQ6
DQ7
VDDQ
DQ16
DQ17
VSSQ
DQ18
DQ19
VDDQ
VDD
VSS
DQ20
DQ21
VSSQ
DQ22
DQ23
VDDQ
DQM0
DQM2
WE
CAS
RAS
CS
BS
A9
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
Features
4/4.5/5/5.5/6 ns
55/55/56.5/60/62 ns
Rev.1
Page 1
DQ28
VDDQ
DQ27
DQ26
VSSQ
DQ25
DQ24
VDDQ
DQ15
DQ14
VSSQ
DQ13
DQ12
VDDQ
VSS
VDD
DQ11
DQ10
VSSQ
DQ9
DQ8
VDDQ
NC
DQM3
DQM1
CLK
CKE
DSF
NC
A8/AP
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Block Diagram
CLOCK
BUFFER
Column Decoder
Row Decoder
CLK
CKE
COMMAND
CS
RAS
CAS
WE
DSF
DECODER
CONTROL
SIGNAL
GENERATOR
2048 X 256 X 32
CELL ARRAY
(BANK #0)
Sense Amplifier
DQM0~31
COLUMN
COUNTER
DQs
BUFFER
A8
COLOR
REGISTER
MODE
REGISTER
ADDRESS
BUFFER
A7
A9
A10
BS
SPECIAL
MODE
REGISTER
Sense Amplifier
Row Decoder
~
A0
MASK
REGISTER
REFRESH
COUNTER
2048 X 256 X 32
CELL ARRAY
(BANK #1)
Column Decoder
Document:
Rev.1
Page 2
DQ0
|
DQ31
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Table 1 shows the details for pin number, symbol, type, and description.
Table 1. Pin Description of VG4632321A
Pin Num- Symbol
ber
Type Description
55
CLK
Input Clock: CLK is driven by the system clock. All SGRAM input signals are sampled on
the positive edge of CLK. CLK also increments the internal burst counter and
control the output registers.
54
CKE
Input Clock Enable: CKE activates(HIGH) and deactivates(LOW) the CLK signal. If CKE
goes low synchronously with clock (set-up and hold time same as other inputs), the
internal clock is suspended from the next clock cycle and the state of output and
burst address is frozen as long as the CKE remains low. When both banks are in
the idle state, deactivating the clock controls the entry to the Power Down and Self
Refresh modes. CKE is synchronous except after the device enters Power Down
and Self Refresh modes, where CKE becomes asynchronous until after exiting the
same mode. The input buffers, including CLK, are disabled during Power Down
and Self Refresh modes providing low standby power.
29
BS
Input Bank Select: BS defines to which bank the BankActivate, Read, Write, or BankPrecharge command is being applied. BS is also used to program the 10th bit of
the Mode and Special Mode registers.
30-34,
45,47-51
A0-A10
Input Address Inputs: A0-A10 are sampled during the BankActivate command (row
address A0-A10) and Read/Write command (column address A0-A7 with A8
defining Auto Precharge) to select one location out of the 512K available in the
respective bank. During a Precharge command, A8 is sampled to determine if both
banks are to be precharged (A8 = HIGH). The address inputs also provide the
op-code during a Mode Register Set or Special Mode Register Set command.
28
CS
Input Chip Select: CS enables (sampled LOW) and disables (sampled HIGH) the
command decoder. All commands are masked when CS is sampled HIGH. CS
provides for external bank selection on systems with multiple banks. It is
considered part of the command code.
27
RAS
Input Row Address Strobe: The RAS signal defines the operation commands in
conjunction with the CAS and WE signals, and is latched at the positive edges of
CLK. When RAS and CS are asserted “LOW” and CAS is asserted “HIGH”, either
the BankActivate command or the Precharge command is selected by the WE
signal. When the WE is asserted “HIGH” the BankActivate command is selected
and the bank designated by BS is turned on to the active state. When the WE is
asserted "LOW", the Precharge command is selected and the bank designated by
BS is switched to the idle state after precharge operation.
26
CAS
Input Column Address Strobe: The CAS signal defines the operation commands in
conjunction with the RAS and WE signals, and it is latched at the positive edges of
CLK. When RAS is held “HIGH” and CS is asserted “LOW”, the column access is
started by asserting CAS “LOW”. Then, the Read or Write command is selected by
asserting WE “LOW” or “HIGH”.
25
WE
Input Write Enable: The WE signal defines the operation commands in conjunction with
the RAS and CAS signals, and it is latched at the positive edges of CLK. The WE
input is used to select the BankActivate or Precharge command and Read or Write
command.
53
DSF
Input Define Special Function: The DSF signal defines the operation commands in
conjunction with the RAS and CAS and WE signals, and it is latched at the positive
edges of CLK. The DSF input is used to select the masked write disable/enable
command and block write command, and the Special Mode Register Set cycle.
Document:
Rev.1
Page 3
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
23,56,24,
57
DQM0DQM3
Input Data Input/Output Mask: DQM0-DQM3 are byte specific, nonpersistent I/O buffer
controls. The I/O buffers are placed in a high-z state when DQM is sampled HIGH.
Input data is masked when DQM is sampled HIGH during a write cycle. Output data
is masked (two-clock latency) when DQM is sampled HIGH during a read cycle.
DQM3 masks DQ31-DQ24, DQM2 masks DQ23-DQ16, DQM1 masks DQ15-DQ8,
and DQM0 masks DQ7-DQ0.
97,98,100,
1,3,4,6,7,
60,61,63,
64,68,69,
71,72,9,
10,12,13,
17,18,20,
21,74,75,
77, 78,80,
81, 83, 84
DQ0DQ31
Input/ Data I/O: The DQ0-31 input and output data are synchronized with the positive
Output edges of CLK. The I/Os are byte-maskable during Reads and Writes. The DQs also
serve as column/byte mask inputs during Block Writes.
30,36-45,
52,58,
86-95
NC
2,8,14,22,
59,67,73,
79
VDDQ
Supply DQ Power: Provide isolated power to DQs for improved noise immunity.
5,11,19,
62,70,76,
82,99
VSSQ
Supply DQ Ground: Provide isolated ground to DQs for improved noise immunity.
15,35,65,
96
VDD
Supply Power Supply: +3.3V
16,46,66,
85
VSS
Supply Ground
Document:
-
No Connect: These pins should be left unconnected.
± 0.3V
Rev.1
Page 4
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Operation Mode
Fully synchronous operations are performed to latch the commands at the positive edges of CLK. Table 2
shows the truth table for the operation commands.
Table 2. Truth Table (Note(1), (2))
Command
State
CKEn-1 CKEn DQM (7) BS
BankActivate & Masked Write Disable
Idle(3)
H
X
X
BankActivate & Masked Write Enable
Idle(3)
H
X
BankPrecharge
Any
H
X
PrechargeAll
RAS CAS
WE
DSF
H
H
L
L
H
H
H
L
H
L
L
A8
A0-7
A9,
A10
CS
V
V
V
L
L
X
V
V
V
L
X
V
L
X
L
Any
H
X
X
X
H
X
L
L
H
L
L
Write
Active (3)
H
X
X
V
L
V
L
H
L
L
L
Block Write Command
Active (3)
H
X
X
V
L
V
L
H
L
L
H
Write and AutoPrecharge
Active (3)
H
X
X
V
H
V
L
H
L
L
L
Block Write and AutoPrecharge
Active (3)
H
X
X
V
H
V
L
H
L
L
H
Read
Active (3)
H
X
X
V
L
V
L
H
L
H
L
Read and AutoPrecharge
Active (3)
H
X
X
V
H
V
L
H
L
H
L
Idle
H
X
X
V
L
V
L
L
L
L
L
Idle(5)
H
X
X
X
X
V
L
L
L
L
H
Any
H
X
X
X
X
X
L
H
H
H
X
H
X
X
X
X
X
L
H
H
L
L
H
X
X
X
X
X
H
X
X
X
X
Mode Register Set
Special Mode Register Set
No-Operation
Burst Stop
Device Deselect
Active
(4)
Any
AutoRefresh
Idle
H
H
X
X
X
X
L
L
L
H
L
SelfRefresh Entry
Idle
H
L
X
X
X
X
L
L
L
H
L
Idle
L
H
X
X
X
X
H
X
X
X
X
L
H
H
H
X
SelfRefresh Exit
(SelfRefresh)
Clock Suspend Mode Entry
Active
H
L
X
X
X
X
X
X
X
X
X
Power Down Mode Entry
Any(6)
H
L
X
X
X
X
H
X
X
X
X
L
H
H
H
L
Clock Suspend Mode Exit
Active
L
H
X
X
X
X
X
X
X
X
X
Any
(PowerDown)
L
H
X
X
X
X
H
X
X
X
X
L
H
H
H
L
Data Write/Output Enable
Active
H
X
L
X
X
X
X
X
X
X
X
Data Write/Output Disable
Active
H
X
H
X
X
X
X
X
X
X
X
Power Down Mode Exit
Note: 1. V = Valid X = Don’t Care L = Low level H = High level
2. CKEn signal is input level when commands are provided.
CKEn-1 signal is input level one clock cycle before the commands are provided.
3. These are states of bank designated by BS signal.
4. Device state is 1, 2, 4, 8, and full page burst operation.
5. The Special Mode Register Set is also available in Row Active State.
6. Power Down Mode can not entry in the burst operation.
When this command assert in the burst cycle, device state is clock suspend mode.
7. DQM0-3
Document:
Rev.1
Page 5
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Commands
1 BankActivate & Masked Write Disable command
(RAS = ”L”, CAS = ”H”, WE = ”H”, DSF = ”L”, BS = Bank, A0-A10 = Row Address)
The BankActivate command activates the idle bank designated by the BS (Bank Select) signal. By
latching the row address on A0 to A10 at the time of this command, the selected row access is initiated.
The read or write operation in the same bank can occur after a time delay of tRCD (min.) from the time of
bank activation. A subsequent BankActivate command to a different row in the same bank can only be
issued after the previous active row has been precharged (refer to the following figure). The minimum
time interval between successive BankActivate commands to the same bank is defined by tRC(min.).
The SGRAM has two internal banks on the same chip and shares part of the internal circuitry to reduce
chip area, therefore it restricts the back-to-back activation of both banks. tRRD(min.) specifies the
minimum time required between activating different banks. After this command is used, the Write
command and the Block Write command perform the no mask write operation.
T0
T1
T2
T3
Tn+3
Tn+4
Tn+5
Tn+6
CLK
ADDRESS
Bank A
Row Addr.
Bank A
Col Addr.
Bank A
Row Addr.
RAS-CAS delay (tRCD)
COMMAND
Bank A
Activate
NOP
Bank A
Row Addr.
RAS-RAS delay time (tRRD)
NOP
Bank B
Activate
R/W A with
AutoPrecharge
NOP
NOP
Bank A
Activate
RAS Cycle time (tRC)
: “H” or “L”
AutoPrecharge
Begin
BankActivate Command Cycle (Burst Length = n, CAS Latency = 3)
2
BankActivate & Masked Write Enable command (refer to the above figure)
(RAS = ”L”, CAS = ”H”, WE = ”H”, DSF = ”H”, BS = Bank, A0-A10 = Row Address)
The BankActivate command activates the idle bank designated by BS signal. After this command is
performed, the Write command and the Block Write command perform the masked write operation. In
the masked write and the masked block write functions, the I/O mask data that was stored in the write
mask register is used.
3
BankPrecharge command
(RAS = ”L”, CAS = ”H”, WE = ”L”, DSF = ”L”, BS = Bank, A8 = ”L”, A0-A7,A9,A10 = Don’t care)
The BankPrecharge command precharges the bank designated by BS signal. The precharged
bank is switched from the active state to the idle state. This command can be asserted anytime after
tRAS(min.) is satisfied from the BankActivate command in the desired bank. The maximum time any
bank can be active is specified by t RAS(max.). Therefore, the precharge function must be performed in
any active bank within tRAS(max.). At the end of precharge, the precharged bank is still the idle state and
ready to be activated again.
4
PrechargeAll command
(RAS = ”L”, CAS = ”H”, WE = ”L”, DSF = ”L”, BS = Don’t care, A8 = ”H”, A0-A7,A9,A10 = Don’t care)
The PrechargeAll command precharges both banks simultaneously. Even if both banks are not in
the active state, the PrechargeAll command can be issued. Both banks are then switched to the idle
state.
5
Read command
(RAS = ”H”, CAS = ”L”, WE = ”H”, DSF = ”L”, BS = Bank, A8 = ”L”, A0-A7 = Column Address, A9,A10 = Don’t
care)
Document:
Rev.1
Page 6
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
The Read command is used to read burst of data on consecutive clock cycles from an active row
in an active bank. The bank must be active for at least tRCD(min.) before Read command is issued.
During read bursts, the valid data-out element from the starting column address will be available
following the CAS latency after the issue of Read command. Each subsequent data-out element will
be valid by the next positive clock edge (refer to the following figure). The DQs goes into
high-impedance at the end of the burst, unless other command was initiated. The burst length, burst
sequence, and CAS latency are determined by the mode register which is already prgrammed.A
full-page burst will continue until terminated (at the end of the page it will wrap to column 0 and continue).
T0
T1
T2
T3
NOP
NOP
NOP
NOP
DOUT A1
DOUT A2
DOUT A3
DOUT A0
DOUT A1
DOUT A2
DOUT A3
DOUT A0
DOUT A1
DOUT A2
T4
T5
T6
T7
T8
CLK
COMMAND
READ A
CAS Iatency = 1
tCK1,DQ’s
DOUT A0
CAS Iatency = 2
tCK2,DQ’s
CAS Iatency = 3
tCK3,DQ’s
NOP
NOP
NOP
NOP
DOUT A3
Burst Read Operation (Burst Length = 4, CAS Latency = 1, 2, 3)
The read data appears on the DQs subjects to the values on the DQM inputs two clocks early (i.e.
DQM latency is two clocks for output buffers). A read burst without auto precharge function may be
interrupted by a subsequent Read or Write/Block Write command to the same bank or the other
active bank before the end of burst length. It may be interrupted by a BankPrecharge/PrechargeAll
command to the same bank too. The interrupt comes from Read command can occur on any clock
cycle following a previous Read command (refer to the following figure).
T0
T1
T6
T2
T3
T4
NOP
NOP
NOP
DOUT B0
DOUT B1
DOUT B2
DOUT B3
DOUT A0
DOUT B0
DOUT B1
DOUT B2
DOUT B3
DOUT A0
DOUT B0
DOUT B1
DOUT B2
T5
T7
T8
CLK
COMMAND
CAS Iatency = 1
tCK1,DQ’s
CAS Iatency = 2
tCK2,DQ’s
CAS Iatency = 3
t CK3,DQ’s
READ A
READ B
DOUT A0
NOP
NOP
NOP
NOP
DOUT B3
Read Interrupted by a Read (Burst Length = 4, CAS Latency = 1, 2, 3)
The DQM inputs are used to avoid I/O contention on DQ pins when the interrupt comes from
Write/Block Write command. The DQMs must be asserted (High) at least two clocks prior to the
Write/Block Write command to suppress data-out on DQ pins. To guarantee DQ pins against the I/O
contention, a single cycle with high-impedance on DQ pins must occur between the last read data
and the Write/Block Write command (refer to the following three figures). If the data output of burst
read occurs at the second clock of burst write, the DQMs must be asserted (High) at least one clock
prior to the Write/Block Write command to avoid internal bus contention.
Document:
Rev.1
Page 7
Preliminary
VIS
T1
T0
T2
T3
NOP
NOP
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
T4
T5
T6
T7
T8
CLK
DQM
NOP
COMMAND
READ A
DQ’s
DOUT A0
: “H” or “L”
NOP
NOP
Must be Hi-Z before
the Write Command
WRITE B
DINB0
NOP
NOP
DINB1
DINB2
Read to Write interval (Burst Length °Ÿ 4, CAS Latency = 3)
T0
T1
T2
T3
T4
T5
T6
T7
T8
1 Clk Interval
CLK
DQM
NOP
COMMAND
NOP
BANK A
ACTIVATE
READ A
NOP
WRITE A
NOP
NOP
NOP
DIN A0
DIN A1
DIN A2
DIN A3
DIN A0
DIN A1
DIN A2
DIN A3
CAS Iatency = 1
tCK1,DQ’s
Must be Hi-Z before
the Write Command
CAS Iatency = 2
tCK2,DQ’s
: “H” or “L”
Read to Write interval (Burst Length °Ÿ 4, CAS Latency = 1, 2)
T0
T1
NOP
NOP
T2
T3
T4
T5
T6
T7
T8
CLK
DQM
COMMAND
READ A
NOP
NOP
WRITE B
NOP
NOP
DIN B1
DINB2
DIN B3
DIN B1
DIN B2
DIN B3
NOP
CAS Iatency = 1
tCK1,DQ’s
DOUT A0
DIN B0
Must be Hi-Z before
the Write Command
CAS Iatency = 2
tCK2,DQ’s
DIN B0
: “H” or “L”
Read to Write interval (Burst Length °Ÿ 4, CAS Latency = 1, 2)
A read burst without auto precharge function may be interrupted by a BankPrecharge/
PrechargeAll command to the same bank. The following figure shows the optimum time that
BankPrecharge/PrechargeAll command is issued in different CAS latency.
Document:
Rev.1
Page 8
Preliminary
VIS
T0
T1
T2
T3
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
T4
T6
T5
T7
T8
CLK
Bank
Col A
ADDRESS
Bank
Row
Bank(s)
t RP
READ A
COMMAND
CAS Iatency = 1
NOP
DOUT A0
tCK1 ,DQ’s
CAS Iatency = 2
tCK2 ,DQ’s
NOP
NOP
Precharge
DOUT A1
DOUT A2
DOUT A3
DOUT A0
DOUT A1
DOUT A2
DOUT A0
DOUT A1
CAS Iatency = 3
tCK3 ,DQ’s
NOP
NOP
Activate
NOP
DOUT A3
DOUT A2
DOUT A3
Read to Precharge (CAS Latency = 1, 2, 3)
6
Read and AutoPrecharge command
(RAS = ”H”, CAS = ”L”, WE = ”H”, DSF = ”L”, BS = Bank, A8 = ”H”, A0-A7 = Column Address, A9,A10 = Don’t
care)
The Read and AutoPrecharge command automatically performs the precharge operation after the read
operation. Once this command is given, any subsequent command can not occur within a time delay of
{tRP(min.) + burst length}. At full-page burst, only read operation is performed in this command and the auto
precharge function is ignored.
7
Write command
(RAS = ”H”, CAS = ”L”, WE = ”L”, DSF = “L”, BS = Bank, A8 = ”L”, A0-A7 = Column Address, A9,A10 = Don’t
care)
The Write command is used to write burst of data on consecutive clock cycles from an active row in an
active bank. The bank must be active for at least tRCD(min.) before Write command is issued. During write
bursts, the first valid data-in element will be registered coincident with the Write command. Subsequent data
elements will be registered on each successive positive clock edge (refer to the following figure). The DQs
remains high-impedance at the end of the burst, unless other command was initiated. The burst length and
burst sequence are determined by the mode register which is already programmed. A full-page burst will continue until terminated (at the end of the page it will wrap to column 0 and continue).
T0
T1
T2
T3
WRITE A
NOP
NOP
T4
T5
T6
T7
T8
CLK
COMMAND
DQ0 - DQ3
NOP
DIN A0
DIN A1
DIN A2
NOP
NOP
DIN A3
don’t care
NOP
NOP
NOP
Extra data is masked.
The first data element and the write
are registered on the same clock edge.
Burst Write Operation (Burst Length = 4, CAS Latency = 1, 2, 3)
Any Write performed to a row that was opened via an BankAcitvate & Masked Write Enable command is a
masked write (Write-Per-Bit). Data is written to the 32 cells (bits) at the selected column location subject to the
data stored in the Mask register. The overall mask consists of the DQM inputs, which mask on a per-byte
basis, and the Mask register, which masks on a per-bit basis. This is shown in the following block diagram.
Document:
Rev.1
Page 9
Preliminary
VIS
DSF
DQM0
Q
D
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
DRAM
CELL
CK
BankActivate
command
DQ7
MR7
DQ6
MR6
DQ5
MR5
DQ4
MR4
DQ3
MR3
DQ2
MR2
DQ1
MR1
DQ0
MR0
0 = Masked
1 = Not Masked
Note: Only lower byte is shown. The operation is identical for other bytes.
Write Per Bit (I/O Mask) Block Diagram
A write burst without auto precharge function may be interrupted by a subsequent Write/Block
Write, BankPrecharge/PrechargeAll, or Read command before the end of burst length. The interrupt
comes from Write/Block Write command can occur on any clock cycle following the previous Write
command ( refer to the following figure).
T0
T1
T2
T3
T4
NOP
NOP
NOP
DIN B2
DIN B3
T5
T6
T7
T8
CLK
COMMAND
NOP
WRITE A
WRITE B
NOP
NOP
NOP
1 Clk Interval
DQ’s
DIN A0
DIN B0
DIN B1
Write Interrupted by a Write (Burst Length = 4, CAS Latency = 1, 2, 3)
The Read command that interrupts a write burst without auto precharge function should
be issued one cycle after the clock edge at which the last data-in element is registered. In
order to avoid data contention, input data must be removed from the DQs at least one clock
cycle before the first read data appears on the outputs (refer to the following figure). Once the
Read command is registered, the data inputs will be ignored, and writes will not be executed.
Document:
Rev.1
Page 10
Preliminary
VIS
T0
T1
T2
T3
READ B
NOP
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
T4
T6
T5
T7
T8
CLK
COMMAND
NOP
CAS latency = 1
tCK1,DQ’s
WRITE A
DOUT B0
DIN A0
CAS latency = 2
DIN A0
don’t care
DIN A0
don’t care
NOP
NOP
NOP
NOP
NOP
DOUT B1
DOUT B2
DOUT B3
DOUT B0
DOUT B1
DOUT B2
DOUT B3
DOUT B1
DOUT B2
tCK2,DQ’s
CAS latency = 3
tCK3,DQ’s
DOUT B0
don’t care
DOUT B3
Input data must be removed from DQ’ s at least one clock
cycle before the Read data appears on the outputs to avoid
data contention
Input data for the write is masked
Write Interrupted by a Read (Burst Length = 4, CAS Latency = 1, 2, 3)
The BankPrecharge/PrechargeAll command that interrupts a write burst without auto precharge function should be issued m cycles after the clock edge at which the last data-in element
is registered, where m equals tWR/tCK rounded up to the next whole number. In addition, the
DQM signals must be used to mask input data, starting with the clock edge following the last
data-in element and ending with the clock edge on which the BankPrecharge/PrechargeAll
command is entered (refer to the following figure).
T0
T1
T2
T3
T4
T5
T6
CLK
DQM
tRP
COMMAND
ADDRESS
WRITE
NOP
Precharge
BANK
COLn
NOP
NOP
Activate
NOP
ROW
BANK (S)
tWR
DQ
DIN
n
:don’t care
DIN
n+1
Write to Precharge
When Burst-Read and Single-Write mode is selected , the write burst length is 1 regardless of the
read burst length (refer to Figures 21 and 22 in Timing Waveforms).
8
Block Write command
(RAS = “H” , CAS = “L” , WE = “L”, DSF = “H” , BS =Bank , A8 = “L” , A3-A7 = Column Address, DQ0-DQ31
= Column Mask)
The block writes are non-burst accesses that write to eight column locations simultaneously. A single
data value, which was previously loaded in the Color register, is written to the block of eight consecutive
column locations addressed by inputs A3-A7. The information on the DQs which is registered coincident with
the Block Write command is used to mask specific column/byte combinations within the block . The mapping
of the DQ inputs to the column/byte combinations is shown in following table.
Document:
Rev.1
Page 11
Preliminary
VIS
DQ
inputs
Column Address
A2
A1
DQ0
0
0
DQ1
0
DQ2
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
A0
DQ Planes
Controlled
DQ
Inputs
Column Address
A2
A1
A0
DQ Planes
Controlled
0
0~7
DQ16
0
0
0
16~23
0
1
0~7
DQ17
0
0
1
16~23
0
1
0
0~7
DQ18
0
1
0
16~23
DQ3
0
1
1
0~7
DQ19
0
1
1
16~23
DQ4
1
0
0
0~7
DQ20
1
0
0
16~23
DQ5
1
0
1
0~7
DQ21
1
0
1
16~23
DQ6
1
1
0
0~7
DQ22
1
1
0
16~23
DQ7
1
1
1
0~7
DQ23
1
1
1
16~23
DQ8
0
0
0
8~15
DQ24
0
0
0
24~31
DQ9
0
0
1
8~15
DQ25
0
0
1
24~31
DQ10
0
1
0
8~15
DQ26
0
1
0
24~31
DQ11
0
1
1
8~15
DQ27
0
1
1
24~31
DQ12
1
0
0
8~15
DQ28
1
0
0
24~31
DQ13
1
0
1
8~15
DQ29
1
0
1
24~31
DQ14
1
1
0
8~15
DQ30
1
1
0
24~31
DQ15
1
1
1
8~15
DQ31
1
1
1
24~31
The overall Block Write mask consists of a combination of the DQM inputs, the Mask register,
and the column/byte mask information, as shown in the following diagram. The DQM and Mask register masking operates as for normal Write command, with the exception that the mask information
is applied simultaneously to all eight columns. Therefore, in a Block Write, a given bit is written only if
a ”0” was registered for the corresponding DQM input, a ”1” was registered for the corresponding DQ
signal, and the corresponding bit in the Mask register is ”1”.
A block write access requires a time period of tBWC to execute, so in general, there should be
m NOP cycles, m equals (tBWC-tCK) /tCK rounded up to the next whole number, after the Block Write
command. However, BankActivate or BankPrecharge commands to the other bank are allowed.
When following a Block Write with a BankPrecharge or PrechargeAll command to the same bank, t BPL
must be met.
Document:
Rev.1
Page 12
VIS
Preliminary
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Block of Columns
(selected by A3-A7 registered
coincident with Block Write command)
Row in Bank
(selected by A0-A10,
and BS registered
coincident with BankActivate
Command)
Column Mask
on the DQ
inputs
(registered
coincident
with Block
Write Command
DSF D Q
BankActivate CK
DQ0
DQ1
DQ2
DQ3
DQ4
DQ5
DQ6
DQ7
DQMO
command
MR2
MR3
MR4
MR5
MR6
MR7
CR0
CR1
CR2
CR3
CR4
CR5
CR6
CR7
Mask Register
(previously loaded
from corresponding
DQ inputs
MR0
MR1
Note: Only lower byte is shown. The operation is identical for other bytes.
Block-Write Masking Block Diagram
Document:
Rev.1
Page 13
Preliminary
VIS
9
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Write and AutoPrecharge command (refer to the following figure)
(RAS = “H” , CAS = “L” , WE = “L” , DSF=”L” , BS = Bank, A8 = ”H”, A0-A7 = Column Address,
A9,A10 = Don’t care)
The Write and AutoPrecharge command performs the precharge operation automatically after
the write operation. Once this command is given, any subsequent command can not occur within a
time delay of {burst length + tWR + tRP(min.)}. At full-page burst, only write operation is performed in
this command and the auto precharge function is ignored.
T0
T1
T2
NOP
NOP
T3
T4
T5
T6
T7
NOP
NOP
NOP
NOP
T8
CLK
COMMAND
Bank A
Activate
Write A
Auto Precharge
NOP
tDAL
*
DIN A0
CAS latency = 1
tck1,DQ’s
DIN A1
tDAL
*
CAS latency = 2
tck2,DQ’s
DIN A0
DIN A1
tDAL
CAS latency = 3
tck3,DQ’s
DIN A0
DIN A1
*
* Begin AutoPrecharge
Bank can be reactivated at completion of tDAL
tDAL = tWR + tRP
Burst Write with Auto-Precharge (Burst Length = 2, CAS Latency = 1, 2, 3)
10 Block Write and AutoPrecharge command
(RAS = “H” , CAS = “L” , WE = “H”, DSF = “H” , BS = Bank , A8 = “H” , A3-A7 = Column Address,
A9,A10 = Don’t care DQ0-DQ31 = Column Mask)
The Block Write and AutoPrecharge command performs the precharge operation automatically after
the block write operation. Once this command is given, any subsequent command can not occur within a
time delay of {tBPL + tRP (min.)}.
11 Mode Register Set command
(RAS = “L” , CAS = ”L”, WE = “L” , DSF = “L” , BS , A0-A10 = Register Data)
The mode register stores the data for controlling the various operating modes of SGRAM. The Mode
Register Set command programs the values of CAS latency. Addressing Mode and Burst Length in the
Mode register to make SGRAM useful for variety of different applications. The default values of the Mode
Register after power-up are undefined, therefore this command must be issued at the power-up
sequence. The state of pins A0-A10 and BS in the same cycle is the data written in the mode register.
One clock cycle is required to complete the write in the mode register (refer to the following figure ). The
mode register contents can be changed using the same command and the clock cycle requirements during operation as long as both banks are in the idle state.
Document:
Rev.1
Page 14
Preliminary
VIS
T0
CLK
T1
T2
T3
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
T5
T4
T6
T7
T8
T9
tCK2
CKE
Clock min
CS
RAS
CAS
WE
DSF
BS
A8
Address key
A0-A7,
A9,A10
DQM
DQ
tRP
Hi-Z
PrechargeAll
Mode Register
Set Command
Any
Command
Mode Register Set Cycle (CAS Latency = 1, 2, 3)
The mode register is divided into various fields depending on functionality.
•
Burst Length Field (A2~A0)
This field specifies the data length of column access using the A2~A0 pins and selects the
Burst Length to be 1, 2, 4, 8, or full page.
A2
0
0
0
0
1
1
1
1
Document:
A1
0
0
1
1
0
0
1
1
A0
0
1
0
1
0
1
0
1
Burst Length
1
2
4
8
Reserved
Reserved
Reserved
Full Page
Rev.1
Page 15
T10
Preliminary
VIS
•
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Addressing Mode Select Field (A3)
The Addressing Mode can be one of two modes, Interleave Mode or Sequential Mode.
Sequential Mode supports burst length of 1, 2, 4, 8, or full page. But, lnterleave Mode only supports
burst length of 4 and 8.
A3
Addressing Mode
0
Sequential
1
Interleave
--- Addressing Sequence of Sequential Mode
An internal column address is performed by increasing the address from the column
address which is input to the device. The internal column address is varied by the Burst
Length as shown in the following table. When the value of column address, (n+m), in the
table is larger than 255, only the least significant 8 bits are effective.
Data n
0
1
2
3
4
5
6
7
-
255
256
257
-
Column Address
n
n+1
n+2
n+3
n+4
n+5
n+6
n+7
-
n+255
n
n+1
-
2 words:
4 words:
Burst Length
8 words:
Full Page: Column address is repeated until terminated.
--- Addressing Sequence of Interleave Mode
A column access is started in the input column address and is performed by inverting the
address bits in the sequence shown in following table.
Data n
•
Column Address
Burst Length
Data 0
A7
A6
A5
A4
A3
A2
A1
A0
Data 1
A7
A6
A5
A4
A3
A2
A1
A0
Data 2
A7
A6
A5
A4
A3
A2
A1
A0
Data 3
A7
A6
A5
A4
A3
A2
A1
A0
Data 4
A7
A6
A5
A4
A3
A2
A1
A0
Data 5
A7
A6
A5
A4
A3
A2
A1
A0
Data 6
A7
A6
A5
A4
A3
A2
A1
A0
Data 7
A7
A6
A5
A4
A3
A2
A1
A0
4 Words
8 Words
CAS Latency Field (A6 ~ A4)
This field specifies the number of clock cycles from the assertion of the Read command
to the first read data. The minimum value of CAS Latency depends on the frequency of
CLK. And this value satisfying the following formula must be programmed into this field.
tCAC (min) ≤ CAS Latency x tCK
A6
0
0
0
0
1
Document:
A5
0
0
1
1
X
A4
0
1
0
1
X
CAS Latency
Reserved
1 clock
2 clocks
3 clocks
Reserved
Rev.1
Page 16
Preliminary
VIS
•
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Mode field (A8~A7)
A7 and A8 must be programmed to “00” in normal operation.
•
A8
A7
Test Mode
0
0
normal mode
0
1
Vendor Use Only
1
x
Vendor Use Only
Single Write Mode (A9)
This bit is used to select the write mode. When the A9 bit is “0”, Burst Read and Burst Write mode is
selected. When the A9 bit is ”1”, Burst Read and Single Write mode is Selected.
12
A9
Single Write Mode
0
Burst Read and Burst Write
1
Burst Read and Single Write
Special Mode Register Set command
(RAS = ”L”, CAS = ”L”, WE = ”L”, DSF = ”H”, BS, A0-A10 = Register Data)
The special mode register is used to load the Color and Mask registers, which are used in Block
Write and masked Write cycles. The control information being written to the Special Mode register is
applied to the address inputs and the data to be written to either the Color register or the Mask register is
applied to the DQs. When A6 is “high” during a Special Mode Register Set cycle, the Color register will be
loaded with the data on the DQs. Similarly, when A5 is “high” during a Special Mode Register Set cycle,
the Mask register will be loaded with the data on the DQs. A6 = A5 = 1 in the Special Mode Register Set
cycle is illegal.
Functions
BS
A10~A7
A6
A5
A4~A0
Leave Unchanged
X
X
0
0
X
Load Mask Register
X
X
0
1
X
Load Color Register
X
X
1
0
X
Illegal
X
X
1
1
X
One clock cycle is required to complete the write in the Special Mode register. This command can
be issued at the active state. As in write operation, this command accepts the data needed through DQ
pins. Therefore it should be attended not to induce bus contention.
13
No-Operation command
(RAS = ”H”, CAS = ”H”, WE = ”H”)
The No-Operation command is used to perform a NOP to SGRAM which is selected (CS is Low).
This prevents unwanted commands from being registered during idle or wait states.
14
Burst Stop command
(RAS = ”H”, CAS = ”H”, WE = ”L’, DSF = ”L”)
Burst Stop command is used to terminate either fixed-length or full-page bursts. This command is
only effective in a read/write burst without auto precharge function. The terminated read burst ends after
a delay equal to the CAS latency (refer to the following figure). The termination of a write burst is shown
in the following figure.
Document:
Rev.1
Page 17
Preliminary
VIS
T0
T1
T2
T3
NOP
NOP
NOP
T4
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
T6
T5
T7
T8
CLK
READ A
COMMAND
CAS Iatency = 1
tCK1,DQ’s
DOUT A0
CAS Iatency = 2
tCK2,DQ’s
Burst Stop
NOP
NOP
NOP
The burst ends after a delay equal to the CAS latency.
DOUT A1
DOUT A2
DOUT A3
DOUT A0
DOUT A1
DOUT A2
DOUT A3
DOUT A0
DOUT A1
DOUT A2
CAS Iatency = 3
tCK3,DQ’s
NOP
DOUT A3
Termination of a Burst Write Operation (Burst Length > 4, CAS Latency = 1, 2, 3)
T0
T1
T2
T3
WRITE A
NOP
NOP
Burst Stop
DIN A1
DIN A2
don’t care
T4
T5
T6
T7
T8
CLK
COMMAND
CAS latency = 1, 2, 3
NOP
DIN A0
NOP
NOP
NOP
NOP
DQ’s
Input data for the Write is masked.
Termination of a Burst Write Operation (Burst Length = X, CAS Latency = 1, 2, 3)
15
Device Deselect command
(CS = ”H”)
The Device Deselect command disables the command decoder so that the RAS, CAS, WE
and Address inputs are ignored, regardless of whether the CLK is enabled. This command is
similar to the No Operation command.
16
AutoRefresh command (refer to Figures 3 & 4 in Timing Waveforms)
(RAS = ”L”, CAS = ”L”, WE = ”H”, DSF = ”L”, CKE = ”H”, BS, A0-A10 = Don’t care)
The AutoRefresh command is used during normal operation of the SGRAM and is
analagous to CAS-before-RAS(CBR) Refresh in conventional DRAMs. This command is
non-persistent, so it must be issued each time a refresh is required. The addressing is generated
by the internal refresh controller. This makes the address bits a “don’t care” during an
AutoRefresh command. The internal refresh counter increments automatically on every auto
refresh cycle to all of the rows. The refresh operation must be performed 2048 times within
32ms. The time required to complete the auto refresh operation is specified by tRP(min.). To
provide the AutoRefresh command, both banks need to be in the idle state and the device is not
in power down mode (CKE is high in the previous cycle). This command must be followed by
NOPs until the auto refresh operations is completed. The precharge time requirement, tRP(min.)
must be met befor successive auto refresh operations are performed.
17
SelfRefresh Entry command (refer to Figure 5 in Timing Waveforms)
(RAS = ”L”, CAS = ”L”, WE = ”H”, DSF = ”L”, CKE = ”L”, BS, A0-A10 = Don’t care)
The SelfRefresh is another refresh mode available in the SGRAM. It is the preferred refresh
mode for data retention and low power operation. Once the SelfRefresh command is registered,
all the inputs to the SGRAM becomes “don’t care” with the exception of CKE, which must remain
LOW. The refresh addressing and timing is internally generated to reduce power comsumption.
The SGRAM may remain in SelfRefresh mode for an indefinite period. Once the SGRAM enters
the SelfRefresh mode , tRAS (min.) is required before exit from SelfRefresh mode. The
SelfRefresh mode is exited by restarting the external clock and then asserting high on CKE(SelfRefresh Exit command).
Document:
Rev.1
Page 18
VIS
Preliminary
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
18
SelfRefresh Exit command (refer to Figure 5 in Timing Waveforms)
(CKE = ”H”, CS = ”H” or CKE = ”H”, RAS = ”H”, CAS = ”H”, WE = ”H”)
The command is used to exit from the SelfRefresh mode. Once this command is registered,
NOP or Device Deselect commands must be issued for tRC(min), because time is required for the
completion of any bank currently being internally refreshed. If auto refresh cycles in bursts are performed during normal operation, a burst of 1024 auto refresh cycles should be completed just prior to
entering, and just after exiting the SelfRefresh mode.
19
Clock Suspend Mode Entry/PowerDown Mode Entry command (refer to Figures 6, 7, and 8 in Timing
Waveforms)
(CKE = ”L”)
When SGRAM operating the burst cycle, the internal CLK is suspended (masked) from the subsequent cycle by issuing this command (asserting CKE ”low”). The device operation is held intact
while CLK is suspended. On the other hand, when both banks are in the idle state, this command performs entry into the PowerDown mode. All input and output buffers (except the CKE buffer) are turned
off in the PowerDown mode. The device may not remain in the Clock Suspend or PowerDown state
longer than the refresh period (16ms) since the command does not perform any refresh operations.
20
Clock Suspend Mode Exit/PowerDown Mode Exit command (refer to Figures 6, 7, and 8 in Timing
Waveforms)
(CKE = ”H”)
When the internal CLK has been suspended, the operation of the internal CLK is resumed from
the subsequent cycle by providing this command (asserting CKE “high”). When the device is in the
PowerDown mode, the device exits this mode and all disabled buffers are turned on to the active
state. tPDE(min.) is required when the device exit from the PowerDown mode. Any subsequent commands can be issued after one clock cycle from the end of this command.
21
Data Write/Output Enable, Data Mask/Output Disable command
(DQM = ”L”, ”H”)
During a write cycle, the DQM signal functions as Data Mask and can control every word of the
input data. During a read cycle, the DQM functions as the control of output buffers. DQM is also used
for device selection, byte selection and bus control in a memory system. DQM0 controls DQ0 to DQ7,
DQM1 controls DQ8 to DQ15, DQM2 controls DQ16 to DQ23, DQM3 controls DQ24 to DQ31, DQM
masks the DQ’s by a byte regardless that the corresponding DQ’s are in a state of write-per-bit masking or pixel masking. the byte control. The each DQM0-3 corresponds to DQ0-7, DQ8-15, DQ16-23,
DQ24-31.
Document:
Rev.1
Page 19
Preliminary
VIS
Absolute Maximum Rating
Symbol
VIN, VOUT
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Item
Input, Output Voltage
Rating
-0.3~VDD + 0.3
Unit
V
VDD, VDDQ
Power Supply Voltage
-0.3~4.6
V
TOPR
Operating Temperature
0~70
°C
TSTG
Storage Temperature
-55~150
°C
T SOLDER
Soldering Temperature(10s)
260
°C
PD
Power Dissipation
1
W
IOUT
Short Circuit Output Current
50
mA
Recommended D.C. Operating Conditions (Ta = 0~70°C)
Symbol
Parameter
VDD
Power Supply Voltage
Min.
3.0
Typ.
3.3
Max.
3.6
Unit
V
VDDQ
Power Supply Voltage (for I/O Buffer)
3.0
3.3
3.6
V
VIH
LVTTL Input High Voltage
2.0
-
VDD+ 0.3
V
VIL
LVTTL Input Low Voltage
-0.3
-
0.8
V
Capacitance (VDD = 3.3V, f = 1MHz, Ta = 25°C)
Symbol
Parameter
Min.
Max.
Unit
CI
Input Capacitance
-
5
pF
CI/O
Input/Output Capacitance
-
7
pF
Note: These parameters are periodically sampled and are not 100% tested.
Document:
Rev.1
Page 20
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Recommended D.C. Operating Conditions (VDD = 3.3V ± 0.3V, Ta = 0 ~ 70°C)
-4.5
-5
-5.5
-6
-7
Unit
Symbol Min. Max. Min. Max. Min. Max Min. Max. Min. Max.
Description/test condition
Operating Current
t
≥t
, Outputs Open
RC RC ( min )
Address changed once during t CK(min).
Note
IDD1
230
220
210
200
180
3,4
IDD2N
45
45
45
45
45
3
IDD2NS
20
20
20
20
20
Precharge Standby Current in power-down
mode
tCK =15ns, CKE ≤ V I L (max)
IDD2P
2
2
2
2
2
Precharge Standby Current in power-down
mode
IDD2PS
2
2
2
2
2
Active Standby Current in non power down
mode
CKE ≥ V I H (min), tCK = 15ns(Both Bank Active)
Input signals are changed once during 30ns.
IDD3N
50
50
50
50
50
Active Standby Current in power-down mode
CKE ≤ V I L (max), tCK = 15ns,
IDD3P
5
5
5
5
5
Operating Current (Page Burst, and All Bank
activated)
tCCD = tCCD(min), Outputs Open,
Multi-bank interleave, gapless data
IDD4
310
290
275
260
230
4,5
Refresh Current
t RC ≥ t RC (min) (tREF = 32ms)
IDD5
230
220
210
200
180
3
Self Refresh Current
IDD6
3.5
3.5
3.5
3.5
3.5
IDD7
230
210
200
180
150
Burst Length = 1, One bank active
Precharge Standby Current in non power-down
mode
tCK = 15ns, CS ≥ V I H(min), CKE ≥ V I H (min)
Input signals are changed once during 30ns.
Precharge Standby Current in non power-down
mode
tCK = ∞ , CKE ≥ V I H (min), CLK
mA
≤ VIL (max)
Input signals are stable
tCK = ∞ , CKE ≤ V I L (max), CLK
CS
≥
CKE
3
≤ VIL (max)
3
VIH(min)(Both Bank Active)
≤ 0.2V
Operating Current (One Bank Block Write)
tCK = tCK(min), Outputs Open, tBWC = tBWC(min)
Parameter
IIL
Description
( 0V ≤ V
IN
≤V
DD
Input Leakage Current
All other pins not under test = 0V)
Min.
Max.
Unit
-5
5
µA
IOL
Output Leakage Current
Output disable, ( 0V ≤ V
≤V
)
OUT
DDQ
-5
5
µA
VOH
LVTTL Output ”H” Level Voltage
(lOUT = -2mA)
2.4
-
V
Document:
Rev.1
Page 21
Note
VIS
VOL
Document:
Preliminary
LVTTL Output ”L” Level Voltage
(lOUT = 2mA)
Rev.1
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
-
0.4
V
Page 22
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Electrical Characteristics and Recommended A.C. Operating Conditions
(VDD = 3.3V ± 0.3V, Ta = 0~70°C) (Note: 6, 7, 8, 9, 10) *** CL is CAS Latency.
symbol
A.C. Parameter
-4.5
Min.
-5
Max.
Min.
-5.5
Max.
Min.
-6
Max.
Min.
-7
Max.
Min.
Max.
unit note
tRC
Row cycle time
55
55
56.5
60
62
10
tRCD
RAS to CAS delay
15
15
16.5
18
20
10
tRP
Precharge to refresh/row activate
command
15
15
16.5
18
20
10
tRRD
Row activate to row activate delay
9
10
11
12
14
10
tRAS
Row activate to precharge time
40
tWR
Write recovery time
7
7
7
7
7
CL* = 1
-
-
-
18
18
CL* = 2
-
-
-
8
9
CL* = 3
4.5
5
5.5
6
7
tCK1
tCK2
Clock cycle time
tCK3
100K
40
100K
40
100K
42
100K
42
tCH
Clock high time
2
2
2
2
2.5
tCL
Clock low time
2
2
2
2
2.5
tAC1
tAC2
Access time from CLK
(positive edge)
tAC3
100K
ns
CL* = 1
-
-
-
17
17
CL* = 2
-
-
-
6
6
CL* = 3
4
4.5
5
5.5
6
tT
Transition time of CLK (Rise and Fall)
tCCD
CAS to CAS Delay time
tOH
Data output hold time
tLZ
tHZ1
0.5
10
0.5
10
0.5
10
0.5
10
0.5
1
1
1
1
1
1.5
2
2
2
2
Data output low impedance
2
2
2
2
2
Data output high impedance(CL = 1)
-
-
-
-
-
-
2
5
10
CLK
3
6
9
ns
tHZ2
Data output high impedance(CL = 2)
-
-
-
-
-
-
2
5
3
6
tHZ3
Data output high impedance(CL = 3)
2
4
2
4.5
2
4.5
2
5
3
5
tIS
Data/Address/Control Input setup time
1.5
1.5
1.5
1.5
2
tIH
Data/Address/Control Input hold time
0.8
0.8
1
1
1
tSRX
Minimum CKE ”High”for Self-Refresh exit
1
1
1
1
1
CLK
tPDE
Power Down Exit set-up time
4
4
4
5
5
ns
tRSC
(Special) Mode Register Set Cycle time
2
2
2
2
2
CLK
tBWC
Block Write Cycle time
1
1
1
1
1
CLK
tDAL2
Data-in to ACT (REF) Command (CL = 2)
-
-
-
1clk+
tRP
1clk+
tRP
ns
tDAL3
Data-in to ACT (REF) Command (CL = 3) 1clk+
tRP
tBPL
Block Write to Precharge command
tREF
Refresh time
Document:
1
1clk+
tRP
1clk+
tRP
1clk+
tRP
1clk+
tRP
1
1
1
1
32
32
Rev.1
32
32
9
CLK
32
Page 23
9
ms
10
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Note:
1. Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device.
2. All voltages are referenced to VSS.
3. These parameters depend on the cycle rate and these values are measured by the cycle rate under the minimum
value of tCK and tRC. Input signals are changed one time during tCK. Assume that there is only one read/write cycle
during tRC (min).
4. These parameters depend on the output loading. Specified values are obtained with the output open.
5. Assume minimum column address update cycle tCCD (min).
6. Power-up sequence is described in Note 11.
7. A.C. Test Conditions
Reference Level of Output Signals
1.4V / 1.4V
Output Load
Reference to the Under Output Load (B)
Input Signal Levels
3.0V / 0.0V
Transition Time (Rise and Fall) of Input Signals
1ns
Reference Level of Input Signals
1.4V
3.3V
1.4V
1.2K Ω
50 Ω
Output
ZO=50Ω
Output
30pF
870 Ω
30pF
LVTTL D.C. Test Load (A)
LVTTL A.C. Test Load (B)
8. Transition times are measured between VIH and VIL. Transition (rise and fall) of input signals are fixed slope (1 ns).
9. tHZ defines the time at which the outputs achieve the open circuit condition and are not reference levels.
10. These parameters account for the number of clock cycle and depend on the operating frequency of the clock, as
follows:
the number of clock cycles = specified value of timing/Clock cycle time (count fractions as a whole number)
Latency relationship to frequency (Unit : clock cycles)
-4.5 Version (Calculation with tCK = 4.5ns ~ 30ns)
Clock period
(tCK)
30ns
20ns
15ns
10ns
4.5ns
Document:
tRC
tRP
tRRD
tRAS
tRSC
tRCD
55ns
2
3
4
6
13
15ns
1
1
1
2
4
9ns
1
1
1
1
2
40ns
2
2
3
4
9
9ns
1
1
1
1
2
15ns
1
1
1
2
4
Rev.1
Page 24
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
-5 Version (Calculation with tCK = 5ns ~ 30ns)
Clock period
(tCK)
30ns
20ns
15ns
10ns
5ns
tRC
tRP
tRRD
tRAS
tRSC
tRCD
55ns
2
3
4
6
11
15ns
1
1
1
2
3
10ns
1
1
1
1
2
40ns
2
2
3
4
8
10ns
1
1
1
1
2
15ns
1
1
1
2
3
-5.5 Version (Calculation with tCK = 5.5ns ~ 30ns)
Clock period
(tCK)
30ns
20ns
15ns
10ns
5.5ns
tRC
tRP
tRRD
tRAS
tRSC
tRCD
56.5ns
2
3
4
6
11
16.5ns
1
1
2
2
3
11ns
1
1
1
2
2
40ns
2
2
3
4
8
11ns
1
1
1
2
2
16.5ns
1
1
2
2
3
-6 Version (Calculation with tCK = 6ns ~ 30ns)
Clock period
(tCK)
30ns
20ns
15ns
10ns
6ns
tRC
tRP
tRRD
tRAS
tRSC
tRCD
60ns
2
3
4
6
10
18ns
1
1
2
2
3
12ns
1
1
1
2
2
42ns
2
3
3
5
7
12ns
1
1
1
2
2
18ns
1
1
2
2
3
-7 Version (Calculation with tCK = 7ns ~ 30ns)
Clock period
(tCK)
30ns
20ns
15ns
10ns
7ns
tRC
tRP
tRRD
tRAS
tRSC
tRCD
62ns
3
4
5
7
10
20ns
1
1
2
2
3
14ns
1
1
1
2
2
42ns
2
3
3
5
6
14ns
1
1
1
2
2
20ns
1
1
2
2
3
11. Power up Sequence
Power up must be performed in the following sequence.
1) Power must be applied to VDD and VDDQ (simultaneously) when all input signals are held “NOP”
state and CKE = ”H”, DQM = ”H”. The CLK signal must be started at the same time.
2) After power-up, a pause of 200u secouds minimum is required. Then, it is recommended that
DQM is held “high” (VDD levels) to ensure DQ output to be in the high impedance.
3) Both banks must be precharged.
4) Mode Register Set command must be asserted to initialize the Mode register.
5) A minimum of 8 Auto-Refresh dummy cycles must be required to stabilize the internal circuitry of
the device. Sequence of 4 and 5 may be changed.
Document:
Rev.1
Page 25
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Timing Waveforms
Figure 1. AC Parameters for Write Timing (Burst Length = 4, CAS Latency = 2)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
t
t
CL
CH
t
t
CKE
t
CK2
Begin Auto Precharge Begin Auto Precharge
Bank A
Bank B
IS
t
IS
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
t
IH
IS
CS
RAS
CAS
WE
DSF
BS
t IH
A9
RAx
RBx
RAy
RAz
RBy
RAz
RBy
tIS
A0 ~ A8
DQM
RBx
CAx
RBx
CBx
tRCD
RAy
tDAL
tIS
tRC
DQ
tWR
tIH
tRP
tRRD
Hi-Z
Ax0
Activate
Command
Bank A
Document:
CAy
Ax1
Ax2
Ax3
Bx0
Bx1
Bx2
Bx3
Ay0
Ay1
Write with
Write
Activate
Write with
Activate
Auto Precharge Command Auto Precharge Command Command
Bank B
Command
Bank
A
Bank A
Command
Bank B
Bank A
Rev.1
Ay2
Ay3
Precharge
Command
Bank A
Activate
Command
Bank A
Activate
Command
Bank B
Page 1
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 2. AC Parameters for Read Timing (Burst Length = 2, CAS Latency = 2)
T0
T1
T2
T3
T4
T5
T6
T7
T8
T9
T10
T11
T12
T13
CLK
tCH tCL
t CK2
Begin Auto Precharge t
IH
Bank B
t IS
CKE
t
IH
tIS
CS
RAS
CAS
WE
DSF
BS
tIH
A9
RBx
RAx
RAy
tIS
A0 ~ A8
CAx
RAx
RBx
CBx
RAy
tRRD
tRAS
tRC
DQM
tAC2
tLZ
t
RCD
DQ
Hi-Z
Ax0
Activate
Command
Bank A
Document:
t
AC2
tOH
Read
Command
Bank A
Activate
Command
Bank B
Rev.1
tHZ
Ax1
Read with
Auto Precharge
Command
Bank B
tRP
Bx0
Precharge
Command
Bank A
Bx1
Activate
Command
Bank A
Page 2
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 3. Auto Refresh (CBR) (Burst Length = 4, CAS Latency = 2)
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
tCK2
CKE
CS
RAS
CAS
WE
DSF
BS
A9
RAx
A0 ~ A8
RAx
t
RP
CAx
t
RC
t
RC
DQM
DQ
Hi-Z
Ax0
Precharge All Auto Refresh
Command
Command
Document:
Auto Refresh
Command
Rev.1
Ax1
Ax2
Read
Activate
Command Command
Bank A
Bank A
Page 3
Ax3
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 4. Power on Sequence and Auto Refresh (CBR)
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
tCK2
High level
is required
CKE
Minimum of 8 Refresh cycles are required
2 Clock min.
CS
RAS
CAS
WE
DSF
BS
A9
Address Key
A0 ~ A8
DQM
DQ
Hi-Z
Precharge All
Command
1st Auto Refresh
Inputs must be
Command
stable for 200 us
Document:
t
t
RP
2nd Auto Refresh
Command
Rev.1
RC
Mode Register
Set Command
Any
Command
Page 4
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 5. Self Refresh Entry & Exit Cycle
T0 T1
T2
T3
T4
T5
T6
T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19
CLK
* Note 1
* Note 2
CKE
t
* Note 4
* Note 3
RC(min) * Note 7
t
SRX
* Note 5
t
IS
t
PDE
* Note 6
CS
RAS
* Note 8
* Note 8
CAS
BS
A0 ~ A9
WE
DSF
DQM
DQ
Hi-Z
Hi-Z
Self Refresh Enter
Self Refresh Exit
Auto Refresh
Note: To Enter SelfRefresh 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 SelfRefresh mode as long as CKE stays “low”.
Once the device enters SelfRefresh mode, Minimum tRAS is required before exit from SelfRefresh.
Note: To Exit SelfRefresh Mode
4. System clock restart and be stable before returning CKE high.
5. Enable CKE and CKE should be set high for minimum time of tSRX.
6 .CS starts from high.
7. Minimum tRC is required after CKE going high to complete SelfRefresh exit.
8. 1024 cycles of burst AutoRefresh is required before SelfRefresh entry and after SelfRefresh exit if the
system uses burst refresh.
Document:
Rev.1
Page 5
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 6.1 Clock Suspension During Burst Read (Using CKE)
(Burst Length = 4, CAS Latency = 1)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
t
CK1
CKE
CS
RAS
CAS
WE
BS
BS
A9
RAx
A0 ~ A8
RAx
CAx
DQM
t HZ
DQ
Hi-Z
Ax0
Activate
Command
Bank A
Ax1
Ax2
Clock Suspend Clock Suspend
1 Cycle
2 Cycles
Ax3
Clock Suspend
3 Cycles
Read
Command
Bank A
Note: CKE to CLK disable/enable = 1 clock
Document:
Rev.1
Page 6
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 6.2 Clock Suspension During Burst Read (Using CKE)
(Burst Length = 4, CAS Latency = 2)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
t
CK2
CKE
CS
RAS
CAS
WE
DSF
BS
A9
RAx
A0 ~ A8
RAx
CAx
DQM
DQ
t
Hi-Z
Ax0
Ax1
Clock Suspend
1 Cycle
Activate
Command
Bank A
Ax2
HZ
Ax3
Clock Suspend
2 Cycles
Clock Suspend
3 Cycles
Read
Command
Bank A
Note: CKE to CLK disable/enables = 1 clock
Document:
Rev.1
Page 7
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 6.3 Clock Suspension During Burst Read (Using CKE)
(Burst Length = 4, CAS Latency = 3)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
t
CK3
CKE
CS
RAS
CAS
WE
DSF
BS
A9
RAx
A0 ~ A8
RAx
CAx
DQM
DQ
t
Hi-Z
Ax0
Activate
Command
Bank A
Read
Command
Bank A
Ax1
Clock Suspend
1 Cycle
Ax2
Clock Suspend
2 Cycles
HZ
Ax3
Clock Suspend
3 Cycles
Note: CKE to CLK disable/enable = 1 clock
Document:
Rev.1
Page 8
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 7.1 Clock Suspension During Burst Write (Using CKE)
(Burst Length = 4, CAS Latency = 1)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
t
CK1
CKE
CS
RAS
CAS
WE
DSF
BS
A9
RAx
A0 ~ A8
RAx
CAx
DQM
DQ
Hi-Z
DAx0
DAx1
DAx2
Clock Suspend
Activate
1 Cycle
Command
Clock Suspend
Bank A
2 Cycles
DAx3
Clock Suspend
3 Cycles
Write
Command
Bank A
Note: CKE to CLK disable/enable = 1 clock
Document:
Rev.1
Page 9
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 7.2 Clock Suspension During Burst Write (Using CKE)
(Burst Length = 4, CAS Latency = 2)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
t
CK2
CKE
CS
RAS
CAS
WE
DSF
BS
A9
RAx
A0 ~ A8
RAx
CAx
DQM
DQ
Hi-Z
DAx0
DAx1
DAx2
Clock Suspend
Activate
1 Cycle
Command
Clock Suspend
Bank A
2 Cycles
DAx3
Clock Suspend
3 Cycles
Write
Command
Bank A
Note: CKE to CLK disable/enable = 1 clock
Document:
Rev.1
Page 10
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 7.3 Clock Suspension During Burst Write (Using CKE)
(Burst Length = 4, CAS Latency = 3)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
t
CK3
CKE
CS
RAS
CAS
WE
DSF
BS
A9
RAx
A0 ~ A8
RAx
CAx
DQM
DQ
Hi-Z
DAx0
Activate
Command
Bank A
DAx1
DAx2
Clock Suspend
1 Cycle
Clock Suspend
2 Cycles
Write
Command
Bank A
DAx3
Clock Suspend
3 Cycles
Note: CKE to CLK disable/enable = 1 clock
Document:
Rev.1
Page 11
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 8. Power Down Mode and Clock Mask
(Burst Length = 4, CAS Burst Length = 4, CAS Latency = 2)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
t
CK2
t
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
t
IS
PDE
CKE
Valid
CS
RAS
CAS
WE
DSF
BS
A9
RAx
A0 ~ A8
RAx
CAx
DQM
tHZ
DQ
Hi-Z
Ax0
ACTIVE
STANDBY
Activate
Command
Bank A
Power Down
Mode Entry
Document:
Read
Command
Bank A
Ax2
Ax1
Clock Mask
Start
Clock Mask
End
Power Down
Mode Exit
Ax3
PRECHARGE
Precharge STANDBY
Command
Bank A
Power Down
Mode Entry
Rev.1
Power Down
Mode Exit
Any
Command
Page 12
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 9.1 Random Column Read (Page within same Bank)
(Burst Length = 4, CAS Latency = 1)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
t
CK1
CKE
CS
RAS
CAS
WE
DSF
BS
A9
RAw
A0 ~ A8
RAw CAw
RAz
CAx
RAz
CAy
CAz
DQM
DQ
Hi-Z
Aw0
Activate
Command
Bank A
Aw1
Aw2
Aw3
Ax0
Ax1
Ay0
Ay1
Ay2
Read
Read
Command Command
Bank A
Bank A
Az0
Az1
Az2
Az3
Read
Precharge
Command Command
Bank
A
Bank A
Read
Command
Bank A
Document:
Ay3
Activate
Command
Bank A
Rev.1
Page 13
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 9.2 Random Column Read (Page within same Bank)
(Burst Length = 4, CAS Latency = 2)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
t
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CK2
CKE
CS
RAS
CAS
WE
DSF
BS
A9
RAw
A0 ~ A8
RAw
RAz
CAx
CAW
RAz
CAy
CAz
DQM
DQ
Hi-Z
Aw0
Activate
Command
Bank A
Document:
Read
Command
Bank A
Aw1
Aw2
Aw3
Ax0
Ax1
Ay0
Read
Read
Command Command
Bank A
Bank A
Ay1
Ay2
Az0
Ay3
Precharge
Activate
Read
Bank A
Bank A
Az1
Az2
Az3
Command Command Command
Bank A
Rev.1
Page 14
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 9.3 Random Column Read (Page within same Bank)
(Burst Length = 4, CAS Latency = 3)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
t
CK3
CKE
CS
RAS
CAS
WE
DSF
BS
A9
RAw
A0 ~ A8
RAw
RAz
CAy
CAx
CAw
RAz
CAz
DQM
DQ
Hi-Z
Aw0
Activate
Command
Bank A
Read
Command
Bank A
Aw1
Read
Aw2
Aw3
Ax0
Read
Command Command
Bank A
Bank A
Ax1
Ay0
Ay1
Ay2
Precharge
Command
Bank A
Az0
Ay3
Activate
Command
Bank A
Read
Command
Bank A
Note: CKE to CLK disable/enable = 1 clock
Document:
Rev.1
Page 15
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 10.1 Random Column Write (Page within same Bank)
(Burst Length = 4, CAS Latency = 1)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
t
CK1
CKE
CS
RAS
CAS
WE
DSF
BS
A9
RBw
A0 ~ A8
RBw
RBz
CBw
CBx
CBy
RBz
CBz
DQM
DQ
Hi-Z
DBw0 DBw1 DBw2 DBw3 DBx0 DBx1 DBy0 DBy1 DBy2 DBy3
Activate
Command
Bank B
Write
Write
Write
Bank B
Bank B
Command Command
Precharge
Write
Command
Command
Bank B
Bank B
Activate
Command
Bank B
Command
Bank B
Document:
DBz0 DBz1 DBz2 DBz3
Rev.1
Page 16
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 10.2 Random Column Write (Page within same Bank)
(Burst Length = 4, CAS Latency = 2)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
t
CK2
CKE
CS
RAS
CAS
WE
DSF
BS
A9
RBw
A0 ~ A8
RBw
RBz
CBy
CBx
CBy
RBz
CBz
DQM
DQ
Hi-Z
DBw0 DBw1 DBw2 DBw3 DBx0 DBx1 DBy0 DBy1 DBy2 DBy3
Activate
Command
Bank B
Document:
Write
Command
Bank B
Write
Write
Command Command
Bank B
Bank B
Rev.1
DBz0 DBz1 DBz2 DBz3
Precharge
Activate
Write
Bank B
Bank B
Command Command Command
Bank B
Page 17
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 10.3 Random Column Write (Page within same Bank)
(Burst Length = 4, CAS Latency = 3)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
t
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CK3
CKE
CS
RAS
CAS
WE
DSF
BS
A9
RBw
A0 ~ A8
RBw
RBz
CBw
CBx
CBy
CBz
RBz
DQM
DQ
Hi-Z
DBw0 DBw1 DBw2 DBw3 DBx0 DBx1 DBy0 DBy1 DBy2 DBy3
Activate
Command
Bank B
Document:
Write
Command
Bank B
Write
Write
Command Command
Bank B
Bank B
Rev.1
DBz0 DBz1 DBz2
Precharge
Command
Bank B
Activate
Command
Bank B
Write
Command
Bank B
Page 18
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 11.1 Random Row Read (Interleaving Banks)
(Burst Length = 8, CAS Latency = 2)
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t
CKE
CK1
High
CS
RAS
CAS
WE
DSF
BS
A9
RBx
A0 ~ A8
RBx
RBy
RBx
CBx
RAx
RBy
CAx
CBy
tRCD
tAC1
DQM
DQ
Hi-Z
Bx0 Bx1 Bx2 Bx3 Bx4 Bx5
Activate
Command
Bank B
Read
Command
Bank B
Document:
tRP
Bx6 Bx7 Ax0 Ax1 Ax2 Ax3 Ax4 Ax5 Ax6 Ax7
By0 By1 By2
Activate Precharge
Command Command
Bank B
Bank A
Read
Activate
Command Command
Bank B
Bank A
Read
Precharge
Command Command
Bank A
Bank B
Rev.1
Page 19
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 11.2 Random Row Read (lnterleaving Banks)
(Burst Length = 8, CAS Latency = 2)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
CKE
t
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CK2
High
CS
RAS
CAS
WE
DSF
BS
A9
RBx
A0 ~ A8
RBx
RBy
RBx
RAx
CBx
tRCD
CAx
tAC2
RBy
CBy
Ax1 Ax2 Ax3 Ax4 Ax5 Ax6
Ax7
tRP
DQM
DQ
Hi-Z
Bx0
Activate
Read
Command Command
Bank B
Bank B
Bx1 Bx2 Bx3
Bx4 Bx5 Bx6 Bx7 Ax0
Activate
Command
Bank A
Document:
Read
Command
Bank B
Precharge
Command
Bank B
Read
Command
Bank A
Rev.1
By0 By1
Activate
Command
Bank B
Page 20
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 11.3 Random Row Read (Interleaving Banks)
(Burst Length = 8, CAS Latency = 3)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
CKE
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
t
CK3
High
CS
RAS
CAS
WE
DSF
BS
A9
RBx
A0 ~ A8
RBx
RAx
RBy
RAx
CBx
tAC3
tRCD
RBy
CAx
CBy
tRP
DQM
DQ
Hi-Z
Activate
Command
Bank B
Document:
Bx0 Bx1 Bx2 Bx3 Bx4 Bx5 Bx6 Bx7 Ax0 Ax1 Ax2 Ax3 Ax4 Ax5 Ax6 Ax7 By0
Read
Command
Bank B
Activate
Command
Bank A
Read
Precharge
Command Command
Bank B
Bank A
Rev.1
Activate
Command
Bank B
Read
Precharge
Command Command
Bank A
Bank B
Page 21
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 12.1 Random Row Read (Interleaving Banks)
(Burst Length = 8, CAS Latency = 1)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
CKE
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
t
CK1
High
CS
RAS
CAS
WE
DSF
BS
A9
RAx
A0 ~ A8
RAx
RAy
RBx
CAx
RBx
CBx
tRCD
CAy
RAy
tRP
tWR
DQM
DQ
Hi-Z
DAx0 DAx1 DAx2 DAx3 DAx4 DAx5 DAx6 DAx7 DBx0 DBx1 DBx2 DBx3 DBx4 DBx5 DBx6 DBx7
Activate
Command
Bank A
Write
Command
Bank A
Document:
Activate
Command
Bank B
Write
Command
Bank B
Rev.1
Precharge
Command
Bank A
Activate
Command
Bank A
Precharge
Command
Bank B
DAy0 DAy1 DAy2 DAy3
Write
Command
Bank A
Page 22
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 12.2 Random Row Write (Interleaving Banks)
(Brust Length = 4, CAS Latency = 2)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
CKE
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
t
CK2
High
CS
RAS
CAS
WE
DSF
BS
A9
RAx
A0 ~ A8
RAx
RAy
RBx
CAx
RBx
tRCD
RAy
CBx
tWR*
tRP
CAy
tWR*
DQM
DQ
Hi-Z
DAx0 DAx1 DAx2 DAx3 DAx4 DAx5 DAx6 DAx7 DBx0 DBx1 DBx2 DBx3 DBx4 DBx5 DBx6 DBx7 DAy0 DAy1 DAy2 DAy3 DAy4
Activate
Command
Bank A
Write
Command
Bank A
Activate
Command
Bank B
Write
Command
Bank B
Precharge
Command
Bank A
Activate
Command
Bank A
Write
Command
Bank A
Precharge
Command
Bank B
* tWR > tWR(min.)
Document:
Rev.1
Page 23
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 12.3 Random Row Write (Interleaving Banks)
(Burst Length = 8, CAS Latency = 3)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
CKE
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
t
CK3
High
CS
RAS
CAS
WE
BS
BS
A9
RBx
A0 ~ A8
RBx
RBx
CAx
RAy
CBx
RBx
tRCD
RAy
tWR*
CAy
tW R*
tRP
DQM
DQ
Hi-Z
DAx0 DAx1 DAx2 DAx3 DAx4 DAx5 DAx6 DAx7 DBx0 DBx1 DBx2 DBx3 DBx4 DBx5 DBx6 DBx7 DAy0 DAy1 DAy2 DAy3
Activate
Command
Bank A
Write
Command
Bank A
Activate
Command
Bank B
Write
Command
Bank B
Precharge
Command
Bank A
Activate
Command
Bank A
Write
Command
Bank A
Precharge
Command
Bank B
*tWR > tWR (min)
Document:
Rev.1
Page 24
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 13.1 Read and Write Cycle (Burst Length = 4, CAS Latency = 1)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
t
CK1
CKE
CS
RAS
CAS
WE
DSF
BS
A9
RAx
A0 ~ A8
RAx
CAx
CAz
CAy
DQM
DQ
Hi-Z
Ax0
Activate
Command
Bank A
Read
Command
Bank A
Document:
Ax1
Ax2
Ax3
DAy0 DAy1
DAy3
Az0
Read
Write
The Write Data
Command is Masked with a Command
Bank A
Bank A
Zero Clock
Latency
Rev.1
Az1
Az3
The Read Data
is Masked with a
Two Clock
Latency
Page 25
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 13.2 Read and Write Cycle (Burst Length = 4, CAS Latency = 2)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
t
CK2
CKE
CS
RAS
CAS
WE
DSF
BS
A9
RAx
A0 ~ A8
RAx
CAy
CAx
CAz
DQM
DQ
Hi-Z
Ax0
Activate
Command
Bank A
Document:
Read
Command
Bank A
Ax1
Ax2
Ax3
DAy0 DAy1
DAy3
Write
The Write Data
Command is Masked with a
Bank A
Zero Clock
Latency
Rev.1
Az0
Read
Command
Bank A
Az1
Az3
The Read Data
is Masked with a
Two Clock
Latency
Page 26
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 13.3 Read and Write Cycle (Burst Length = 4, CAS Latency = 3)
T0 T1 T2 T3 T4 T5 T6 T7 T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
tCK3
CKE
CS
RAS
CAS
WE
DSF
BS
A9
RAx
A0 ~ A8
RAx
CAx
CAy
CAz
DQM
DQ
Hi-Z
Ax0
Activate
Command
Bank A
Document:
Read
Command
Bank A
Ax1
Ax2
DAy0 DAy1
Ax3
DAy3
Write
The Write Data
Command is Masked with a
Bank A
Zero Clock
Latency
Rev.1
Az0
Read
Command
Bank A
Az1
Az3
The Read Data
is Masked with a
Two Clock
Latency
Page 27
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 14.1 Interleaving Column Read Cycle
(Burst Length = 4, CAS Latency = 1)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
t
CK1
CKE
CS
RAS
CAS
WE
DSF
BS
A9
RAx
A0 ~ A8
RAx
RBw
CAx
tRCD
RBw
CBw
CBx
Ax2
Ax3
Bw0 Bw1
CBy
CBz
CAy
t AC1
DQM
DQ
Hi-Z
Ax0
Activate
Command
Bank A
Read
Command
Bank A
Document:
Ax1
Activate
Command
Bank B
Read
Command
Bank B
Bx0
Read
Command
Bank B
Bx1
Read
Command
Bank B
Rev.1
By0
By1
Ay0
Read
Command
Bank A
Ay1
Bz0
Read
Command
Bank B
Bz1
Bz2
Precharge
Command
Bank A
Bz3
Precharge
Command
Bank B
Page 28
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 14.2 Interleaving Column Read Cycle
(Burst Length = 4, CAS Latency = 2)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
t
CK2
CKE
CS
RAS
CAS
WE
DSF
BS
A9
RAx
A0 ~ A8
RAx
RBw
CAx
t RCD
RBw
CBw
CBx
CBy
Bw0 Bw1
Bx0
CBz
CAy
tAC2
DQM
DQ
Hi-Z
Ax0
Activate
Command
Bank A
Document:
Read
Command
Bank A
Ax1
Activate
Command
Bank B
Ax2
Read
Command
Bank B
Ax3
Read
Command
Bank B
Bx1
Read
Command
Bank B
Rev.1
By0
By1
Read
Command
Bank A
Ay0
Ay1
Bz0
Read
Command
Bank B
Precharge
Command
Bank A
Bz1
Bz2
Bz3
Precharge
Command
Bank B
Page 29
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 14.3. Interleaved Column Read Cycle (Burst Length = 4, CAS Latency = 3)
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t
CK3
CKE
CS
RAS
CAS
WE
DSF
BS
DQM
RBx
tRCD
CBx
CBy
CBz
CAy
t AC3
Hi-Z
Ax0
Activate
Command
Bank A
Document:
CAx
RAx
A0 ~ A8
DQ
RBx
RAx
A9
Read
Command
Bank A
Activate
Command
Bank B
Ax1
Read
Command
Bank B
Ax2
Ax3
Bx0
Read
Command
Bank B
Rev.1
Bx1
By0
Read
Command
Bank B
By1
Bz0
Read
Command
Bank A
Bz1
Ay0
Precharge
Command
Bank B
Ay1
Ay2
Ay3
Precharge
Command
Bank A
Page 30
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 15.1. Interleaved Column Write Cycle (Burst Length = 4, CAS Latency = 1)
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t
CK1
CKE
CS
RAS
CAS
WE
DSF
BS
A9
RAx
A0 ~ A8
RAx
RBw
CAx
RBw
CBw
CBx
CAy
CBy
CBz
tRP
tWR
tRCD
DQM
tRP
tRRD
DQ
Hi-Z
DAx0 DAx1 DAx2
Activate
Command
Bank B
Write
Command
Bank A
Activate
Command
Bank A
Document:
DAx3 DBw0 DBw1 DBx0 DBx1
Write
Command
Bank B
Write
Command
Bank B
DBy0
DBy1 DAy0 DAy1
Write
Command
Bank B
Rev.1
Write
Command
Bank A
DBz0 DBz1 DBz2
Write
Command
Bank B
Precharge
Command
Bank A
DBz3
Precharge
Command
Bank B
Page 31
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 15.2. Interleaved Column Write Cycle (Burst Length = 4, CAS Latency = 2)
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t
CK2
CKE
CS
RAS
CAS
WE
DSF
BS
A9
RAx
A0 ~ A8
RBw
CAx
RAx
CBw
RBw
CBx
CBy
CBz
CAy
tRP
tRCD
DQM
tWR
tRP
tRRD
DQ
Hi-Z
DAx0 DAx1 DAx2
Activate
Command
Bank A
Write
Command
Bank A
DAx3 DBw0 DBw1 DBx0 DBx1
Activate
Command
Bank B
Write
Command
Bank B
Write
Command
Bank B
DBy0 DBy1 DAy0 DAy1
Write
Command
Bank B
Write
Command
Bank A
DBz0 DBz1 DBz2
Write
Command
Bank B
DBz3
Precharge
Command
Bank B
Precharge
Command
Bank A
Document:
Rev.1
Page 32
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 15.3. Interleaved Column Write Cycle (Burst Length = 4, CAS Latency = 3)
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t
CK3
CKE
CS
RAS
CAS
WE
DSF
BS
A9
RAx
A0 ~ A8
RAx
RBw
CAx
RBw
CBw
CBx
CBz
CAy
CBy
tWR
tRP
tWR (min)
tRCD
DQM
tRRD > tRRD(min)
DQ
Hi-Z
DAx0 DAx1 DAx2
Activate
Command
Bank A
Activate
Command
Bank B
DAx3 DBw0 DBw1 DBx0 DBx1
Write
Command
Bank B
Write
Command
Bank B
DBy1 DAy0 DAy1
Write
Command
Bank B
Write
Command
Bank A
DBz0 DBz1 DBz2
Write
Command
Bank B
DBz3
Precharge
Command
Bank B
Precharge
Command
Bank A
Write
Command
Bank A
Document:
DBy0
Rev.1
Page 33
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 16.1. Auto Precharge after Read Burst (Burst Length = 4, CAS Latency = 1)
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t
CKE
CK1
High
CS
RAS
CAS
WE
DSF
BS
A9
RAx
A0~A8
RBx
RAx
CAx
RBz
RBy
CAx
CBx
Ax2
Ax3
CAy
RBy
Bx3
Ay0
CBy
RBz
CBz
DQM
DQ
Hi-Z
Ax0
Activate
Command
Bank A
Read
Command
Bank A
Document:
Ax1
Bx0
Activate
Command
Bank B
Read with
Auto Precharge
Command
Bank B
Bx1
Bx2
Ay1
Activate
Command
Bank B
Read with
Auto Precharge
Command
Bank A
Rev.1
Ay2
Ay3
By0
Read with
Auto Precharge
Command
Bank B
By1
By2
By3
Bz0
Bz1
Activate
Command
Bank B
Read with
Auto Precharge
Command
Bank B
Page 34
Bz2
Bz3
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 16.2 Auto Precharge after Read Burst (Burst Length = 4, CAS Latency = 2)
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t
CK2
CKE
High
CS
RAS
CAS
DSF
WE
BS
A9
RAx
A0 ~ A8
RAx
RBx
CAx
RBx
RAz
RBy
CBx
RAy
RBy
CBy
RAz
CAz
DQM
DQ
Hi-Z
Activate
Command
Bank A
Document:
Ax0 Ax1 Ax2 Ax3 Bx0 Bx1 Bx2 Bx3
Read with
Command
Bank A
Read with
Activate
Auto Precharge
Command Command
Bank B
Bank B
Ay0 Ay1 Ay2 Ay3
By0 By1 By2 By3 Az0 Az1 Az2
Activate
Read with
Read with
Read with
Activate
Auto Precharge
Auto Precharge Command Auto Precharge
Command Command
Command
Command
Bank
A
Bank B
Bank A
Bank A
Bank B
Rev.1
Page 35
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 16.3 Auto Precharge after Read Burst (Burst Length = 4, CAS Latency = 3)
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t
CK3
CKE
High
CS
RAS
CAS
WE
DSF
BS
A9
RAx
A0 ~ A8
RAx
RBx
CAx
RBy
RBy
CAy
CBx
RBx
CBy
DQM
Hi-Z
Activate
Command
Bank A
Document:
Ax0
Activate
Command
Bank B
Read
Command
Bank A
Ax1
Ax2
Read with
Auto Precharge
Command
Bank B
Ax3
Bx0
Bx1
Bx2
Read with
Auto Precharge
Command
Bank A
Rev.1
Bx3
Ay0
Ay1
Activate
Command
Bank B
Ay2
Ay3
BY0
BY1
BY2
Read with
Auto Precharge
Command
Bank B
Page 36
BY3
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 17.1 Auto Precharge after Write Burst (Burst Length = 4, CAS Latency = 1)
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t
CKE
CK1
High
CS
RAS
CAS
WE
DSF
BS
A9
A0 ~ A8
RBx
RAx
RAx
RBx
CAx
RBy
CBx
RAz
RBy
CAy
CBy
RAz
CAz
DQM
DQ
Hi-Z
DAx0 DAx1
Activate
Command
Bank A
Write
Command
Bank A
Document:
DAx2 DAx3
DBx0 DBx1 DBx2
DBx3 DAy0 DAy1 DAy2 DAy3 DBy0 DBy1
Write with
Activate
Auto Precharge
Command
Command
Bank B
Bank B
Activate
Command
Bank B
Write with
Auto Precharge
Command
Bank A
Rev.1
Write with
Auto Precharge
Command
Bank B
DBy2 DBy3
DAz0 DAz1
DAz2
DAz3
Activate
Command
Bank A
Write with
Auto Precharge
Command
Bank A
Page 37
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 17.2. Auto Precharge after Write Burst (Burst Length = 4, CAS Latency = 2)
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t
CK2
CKE
High
CS
RAS
CAS
WE
DSF
BS
A9
A0 ~ A8
RAx
RAx
RBx
CAx
RBx
RAz
RBy
CBx
CAy
RBy
CAz
CBy
RAz
DBy0 DBy1
DBy2 DBy3 DAz0 DAz1 DAz2 DAz3
DQM
DQ
Hi-Z
Activate
Command
Bank A
Document:
DAx0 DAx1 DAx2 DAx3
Write
Command
Bank A
DBx0 DBx1 DBx2 DBx3 DAy0 DAy1 DAy2 DAy3
Write with
Activate Auto Precharge
Command
Command
Bank B
Bank B
Write with
Auto Precharge
Command
Bank A
Rev.1
Activate
Activate
Command Write with
Command Write with
Bank B Auto Precharge
Bank A Auto Precharge
Command
Command
Bank B
Bank A
Page 38
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 17.3. Auto Precharge after Write Burst (Burst Length = 4, CAS Latency = 3)
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t
CKE
CK3
High
CS
RAS
CAS
WE
DSF
BS
A9
RBx
RAx
A0 ~ A8
RAx
CAx
RBy
RBx
CBx
CAy
RBy
CBy
DQM
DQ
Hi-Z
Activate
Command
Bank A
DAx0 DAx1 DAx2 DAx3
Activate
Command
Bank B
DBx0 DBx1 DBx2 DBx3 DAy0 DAy1 DAy2 DAy3
Write with
Auto Precharge
Command
Bank B
Write with
Auto Precharge
Command
Bank A
Write
Command
Bank A
Document:
Rev.1
Activate
Command
Bank B
DBy0 DBy1 DBy2 DBy3
Write with
Auto Precharge
Command
Bank B
Page 39
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 18.1. Full Page Read Cycle (Burst Length = Full Page, CAS Latency = 1)
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t
CKE
CK1
High
CS
RAS
CAS
WE
DSF
BS
A9
A0 ~ A8
CAx
RAx
Hi-Z
RBx
RBy
CBx
t
Ax
Activate
Command
Bank A
Ax+1
Activate
Command
Bank B
Read
Command
Bank A
Document:
RBy
tRRD
DQM
DQ
RBx
RAx
Ax+2
Ax-2
Ax-1
Ax
Ax+1
Bx
Bx+1 Bx+2
Bx+3 Bx+4 Bx+5
Bx+7
Precharge
Command
Bank B
Read
Command
Bank B
The burst counter wraps
from the highest order
page address back to zero
during this time interval
Bx+6
RP
Full Page burst operation does not
terminate when the burst length is satisfied;
the burst counter increments and continues
bursting beginning with the starting address.
Rev.1
Burst Stop
Command
Activate
Command
Bank B
Page 40
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 18.2. Full Page Read Cycle (Burst Length = Full Page, CAS Latency = 2)
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t
CKE
CK2
High
CS
RAS
CAS
WE
DSF
BS
A9
A0 ~ A8
RAx
RAx
RBy
RBx
CAx
CBx
RBx
RBy
DQM
DQ
tRP
Hi-Z
Activate
Command
Bank A
Ax
Read
Command
Bank A
Ax+1
Activate
Command
Bank A
Ax+2
Ax-2
Ax-1
Ax+1
Bx
Read
Command
Bank B
The burst counter wraps
from the highest order
page address back to zero
during this time interval
Document:
Ax
Bx+1
Bx+2
Bx+3
Bx+4
Bx+5
Burst Stop
Command
Bx+6
Precharge
Command
Bank B
Activate
Command
Bank B
Full Page burst operation does not terminate
when the burst length is satisfied; the burst
counter increments and continues bursting
beginning with the starting address.
Rev.1
Page 41
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 18.3. Full Page Read Cycle (Burst Length = Full Page, CAS Latency = 3)
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t
CKE
CK3
High
CS
RAS
CAS
WE
DSF
BS
RAx
RBy
RBx
A9
A0 ~ A8
RAx
CAx
RBx
RBy
CBx
tRP
DQM
Hi-Z
Ax
Ax+1
Ax+2
Ax-2
Ax-1
Ax
Ax+1
Bx
Bx+1
Bx+2
Bx+3
Bx+4
Bx+5
DQ
Activate
Command
Bank A
Read
Command
Bank A
Activate
Command
Bank B
The burst counter wraps
from the highest order
page address back to zero
during this time interval
Document:
Read
Command
Bank B
Precharge
Command
Bank B
Burst Stop
Command
Full Page burst operation does not terminate
when the burst length is satisfied; the burst
counter increments and continues bursting
beginning with the starting address.
Rev.1
Activate
Command
Bank B
Page 42
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 19.1 Full Page Write Cycle (Burst Length = Full Page, CAS Latency = 1)
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t
CK1
CKE
High
CS
RAS
CAS
WE
DSF
BS
A9
A0 ~ A8
RAx
RAx
RBx
CAx
RBy
CBx
RBx
RBy
DQM
DQ
Hi-Z
DAx
Activate
Command
Bank A
DAx+1 DAx+2 DAx+3 DAx-1
DAx+1
DBx
DBx+1 DBx+2 DBx+3 DBx+4 DBx+5 DBx+6 DBx+7
Data is
ignored
Write
Command
Bank B
Activate
Command
Bank B
Write
Command
Bank A
Document:
DAx
The burst counter wraps
from the highest order
page address back to zero
during this time interval
Precharge
Command
Bank B
Burst Stop
Command
Activate
Command
Bank B
Full Page burst operation does
not terminate when the burst
length is satisfied;the burst counter
increments and continues bursting
beginning with the starting address
Rev.1
Page 43
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 19.2 Full Page Write Cycle (Burst Length = Full Page, CAS Latency = 2)
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t
CK2
CKE
High
CS
RAS
CAS
WE
DSF
BS
A9
A0 ~ A8
RAx
RAx
RBy
RBx
CAx
CBx
RBx
RBy
DQM
DQ
DAx
DAx+1 DAx+2 DAx+3 DAx-1 DAx
Activate
Write
Activate
Command Command Command
Bank B
Bank A
Bank A
The burst counter wraps
from the highest order
page address back to zero
during this time interval
Document:
DAx+1
DBx
DBx+1 DBx+2 DBx+3 DBx+4 DBx+5 DBx+6
Write
Command
Bank B
Data is ignored
Full Page burst operation does
not terminate when the burst
length is satisfied;the burst counter
increments and continues bursting
beginning with the starting address.
Rev.1
Precharge Activate
Command Command
Bank B
Bank B
Burst Stop
Command
Page 44
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure19.3 Full Page Write Cycle (Burst Length = Full Page, CAS Latency = 3)
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t
CK3
CKE
High
CS
RAS
CAS
WE
DSF
BS
A9
A0 ~ A8
RAx
RAx
RBy
RBx
CBx
RBx
CAx
RBy
DQM
Data is ignored
DQ
Hi-Z
Activate
Command
Bank A
DAx
DAx+1 DAx+2 DAx+3 DAx-1
Write
Command
Bank A
Activate
Command
Bank B
DAx
DAx+1
DBx+1 DBx+2 DBx+3 DBx+4 DBx+5
Write
Command
Bank B
The burst counter wraps
from the highest order
page addresss back to zero
during this time interval
Document:
DBx
Precharge
Command
Bank B
Activate
Command
Bank B
Full Page burst operation does
Burst stop
not terminate when the burst
Command
length is satisfied;the burst counter
inrements and continues bursting
beginning with the starting address.
Rev.1
Page 45
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 20. Byte Write Operation (Burst Length = 4, CAS Latency = 2)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
High
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
t
CK2
CKE
CS
RAS
CAS
WE
DSF
BS
A9
A0 ~ A8
RAx
RAx
CAx
CAy
CAz
DQM0
DQM1~3
DQ0 - DQ7
DQ8 - DQ31
Ax0
Ax1
Ax2
Ax1
Ax2
Hi-Z
Activate
Read
Command Command
Bank A
Bank A
Ax3
Lower Byte
is masked
Upper 3 Bytes
are masked
Document:
DAy1 DAy2
DAy0 DAy1
Write
Command
Bank A
DAy3
Read
Command
Bank A
Upper 3 Bytes
are masked
Rev.1
Az0
Az1
Az2
Az1
Az2
Lower Byte
is masked
Az3
Lower Byte
is masked
Page 46
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 21. Burst Read and Single Write Operation (Burst Length = 4, CAS Latency = 2)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
High
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
t
CK2
CKE
CS
RAS
CAS
WE
DSF
BS
A9
A0 ~ A8
RAx
RAx
CAw
CAx
CAx
CAy
CAz
DQM0
DQM1~3
DQ0 - DQ7
DQ8 - DQ31
Hi-Z
Hi-Z
Activate
Read
Command Command
Bank A
Bank A
Document:
Ax0
Ax1
Ax2
Ax3
DQw0
Ax0
Ax1
Ax2
Ax3
DQw0
Ay0
DQx0
Read
Single Write
Command
Command
Bank
A
Bank A
Single Write
Command
Bank A
Rev.1
Ay0
Ay1
Ay2
Lower Byte
is masked
Upptr 3 Bytes
is masked
Ay3
Az0
Ay3
Az0
Single Write
Command
Bank A
Page 47
Lower Byte
is masked
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 22. Full Page Burst Read and Single Write Operation
(Burst Length = Full Page, CAS Latency = 3)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
High
t
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CK3
CKE
CS
RAS
CAS
WE
DSF
BS
A9
RAv
A0 ~ A8
RAv
CAv
CAw
CAx
CAy
DQM0
DQM1~3
DQ0 - DQ7
DQ8 - DQ31
Activate
Command
Bank A
Document:
Read
Command
Bank A
Av0
Av1
Av2
Av3
DQw0
DQx0
Av0
Av1
Av2
Av3
Av0
Av1
Av2
Av3
DQw0
DQx0
Av0
Av1
Av2
Av3
Burst Stop
Command
Single Write Single Write Read
Command Command Command
Bank A
Bank A
Bank A
Rev.1
Burst Stop
Command
Page 48
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 23. Random Row Read (lnterleaving Banks)
(Burst Length = 2, CAS Latency = 1)
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
CKE
t
CK1
High
CS
Begin Auto
Precharge
Bank A
Begin Auto
Precharge
Bank B
Begin Auto
Precharge
Bank A
Begin Auto
Precharge
Bank B
Begin Auto
Precharge
Bank A
Begin Auto
Precharge
Bank B
Begin Auto
Precharge
Bank A
Begin Auto
Precharge
Bank B
Begin Auto
Precharge
Bank B
Begin Auto
Precharge
Bank A
RAS
CAS
WE
DSF
BS
A9
A0 ~ A8
RBu
RBu
CBu
RAu
CAu
t
DQM
DQ
Bu0
Activate
Command
Bank B
Activate
Command
Bank A
Read
Bank B
With Auto
Precharge
Document:
RBv
RAu
RBv
CBv
t
RP
Bu1
Au0 Au1
Activate
Command
Bank B
Read
Bank A
With Auto
Precharge
RAv
CAv
RAv
t
RP
Bv0
RBw
Av0
Read
Bank A
With Auto
Precharge
CBw
RAw
Read
Bank B
With Auto
Precharge
RBx
Aw0
Activate
Command
Bank B
Read
Bank A
With Auto
Precharge
RBy
RAx
CBx
t
RP
Bw0 Bw1
Activate
Command
Bank A
Rev.1
CAw
t
RP
Av1
Activate
Command
Bank B
RBx
RAW
t
RP
Bv1
Activate
Command
Bank A
Read
Bank B
With Auto
Precharge
RBw
RAx
CAx
t
RP
Aw1 Bx0
Bx1
Activate
Command
Bank A
Read
Bank B
With Auto
Precharge
RBy
CBy
t
RP
Ax0
Activate
Command
Bank B
Read
Bank A
With Auto
Precharge
RAy
Ax1
RBz
CAy
RAy
t
RP
By0
By1
Activate
Command
Bank A
Read
Bank B
With Auto
Precharge
RAz
RBz
CBz
tRP
RP
Ay0
Ay1
Activate
Command
Bank B
Read
Bank A
With Auto
Precharge
Page 49
RAz
Bz0
Activate
Command
Bank A
Read
Bank B
With Auto
Precharge
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 24. Full Page Random Column Read (Burst Length = Full Page, CAS Latency = 2)
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t
CK2
CKE
CS
RAS
CAS
WE
DSF
BS
A9
A0 ~ A8
RAx
RBx
RAx
RBx
RBw
CAx
CBx
CAy
CBy
CAz
CBz
RBw
t RP
DQM
t RRD
DQ
tRCD
Ax0
Bx0
Read
Activate
Activate
Command Command Command
Bank
B
Bank A
Bank B
Ay0
Ay1
By1
Read
Read
Command Command
Bank A
Bank B
Read
Read
Command Command
Bank A
Bank A
Document:
By0
Az0
Az1
Az2
Bz0
Bz1
Bz2
Read
Command
Bank B
Precharge
Command Bank B
(Precharge Termination)
Activate
Command
Bank B
Rev.1
Page 50
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 25. Full Page Random Column Write (Burst Length = Full Page, CAS Latency = 2)
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t
CK2
CKE
CS
RAS
CAS
WE
DSF
BS
A9
A0 ~ A8
RAx
RBx
RAx
RBx
RBw
CAx
CBx
CAy
CAz
CBy
CBz
RBw
tWR
tRP
DQM
tRRD
DQ
tRCD
DAx0
Activate
Command
Bank A
Activate
Command
Bank B
DBx0
DAy1
Write
Command
Bank B
Write
Command
Bank A
Document:
DAy0
DBy0
DBy1
Write
Command
Bank B
DAz0
DAz1
Write
Command
Bank A
DAz2
DBz0
DBz1
Write
Command
Bank B
DBz2
Precharge
Command Bank B
(Precharge Termination)
Write Data
is masked
Write
Command
Bank A
Rev.1
Activate
Command
Bank B
Page 51
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 26.1. Precharge Termination of a Burst (Burst Length = Full Page, CAS Latency = 1)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
t
CK1
CKE
CS
RAS
CAS
WE
DSF
BS
RAx
RAy
RAz
A9
CAx
RAx
RAy
CAy
RAz
CAz
A0 ~ A8
tWR tRP
tRP
DQM
Precharge
Termination of
a Read Burst
DQ
DAx0
Activate
Command
Bank A
DAx1
DAx3
Ay0
DAx4
Precharge Termination Precharge
Command
of a Write Burst.
Bank A
Write data is masked.
Write
Command
Bank A
Document:
DAx2
Read
command
Bank A
Activate
Command
Bank A
Rev.1
Ay1
Ay2
DAz0
DAz1
DAz2
DAz3
DAz4
DAz5
DAz6
Write
Precharge
Command Command
Bank A
Bank A
Activate
Command
Bank A
Page 52
DAz7
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 26.2. Precharge Termination of a Burst
(Burst Length = 8 or Full Page, CAS Latency = 2)
T0 T1 T2 T3 T4 T5 T6 T7
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
CLK
t
CK2
High
CKE
CS
RAS
CAS
WE
DSF
BS
RAx
RAy
RAz
A9
RAx
CAx
RAy
CAy
RAz
CAz
A0 ~ A8
tWR
tRP
tRP
tRP
DQM
DQ
DAx0
Activate
Command
Bank A
DAx1
Write
Command
Bank A
DAx2
Ay0
DAx3
Precharge Activate
Command Command
Bank A
Bank A
Read
command
Bank A
Precharge Termination
of a Write Burst.
Write data is masked.
Document:
Rev.1
Ay1
DAz0
Ay2
Precharge
Command
Bank A
Activate
Command
Bank A
DAz1
DAz2
Read
Precharge
Command
Command
Bank A
Bank A
Precharge
Termination of
a Read Burst
Page 53
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Figure 26.3 Precharge Termination of a Burst
(Burst Length = 4, 8 or Full page, CAS Latency = 3)
T0 T1 T2 T3 T4 T5 T6 T7
CLK
T8 T9 T10 T11 T12 T13 T14 T15 T16 T17 T18 T19 T20 T21 T22
t
CK3
High
CKE
CS
RAS
CAS
WE
DSF
BS
A9
A0 ~ A8
RAy
RAx
RAx
CAx
RAy
t WR
RAz
CAy
RAz
t
t RP
RP
DQM
DQ
DAx0 DAx1
Activate
Command
Bank A
Write
Command
Bank A
Write Data
is masked
Document:
Ay0
Precharge
Command
Bank A
Activate
Command
Bank A
Read
Command
Bank A
Ay1
Ay2
Precharge Activate
Command
Command Bank A
Bank A
Precharge Termination
of a Write Burst
Precharge Termination
of a Write Burst
Rev.1
Page 54
Preliminary
VIS
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Ordering Information
Part Number
Frequency
Package
Packing Type
VG4632321AQ - 7
143MHz
QFP
Tray
VG4632321AQ - 7R
143MHz
QFP
Tape & Reel
VG4632321AQ - 6
166MHz
QFP
Tray
VG4632321AQ - 6R
166MHz
QFP
Tape & Reel
VG4632321AQ - 55
183MHz
QFP
Tray
VG4632321AQ - 55R
183MHz
QFP
Tape & Reel
VG4632321AQ - 5
200MHz
QFP
Tray
VG4632321AQ - 5R
200MHz
QFP
Tape & Reel
VG4632321AQ - 45
222MHz
QFP
Tray
VG4632321AQ - 45R
222MHz
QFP
Tape & Reel
VG4632321AQ - 7
• VG
• VIS Memory Product
• 46
• Synchronous Graphic
• 32321
• Sync, 2k self - ref. 1M x 32 SGRAM
•A
• Revision
•Q
•7
•R
Document:
• Package Type (Q : QFP)
• Speed (7 : 7ns, 6 : 6ns, 5 : 5ns)
• Packing Type (R : Tape & Reel, Blank : Tray)
Rev.1
Page 55
VIS
Preliminary
VG4632321A
524,288x32x2-Bit
CMOS Synchronous Graphic RAM
Outline Drawing Information
Document:
Rev.1
Page 56