參數(shù)資料
型號: IS42G32256
廠商: Integrated Silicon Solution, Inc.
英文描述: 256K x 32 x 2 (16-Mbit) SYNCHRONOUS GRAPHICS RAM
中文描述: 256K × 32 × 2(16兆)同步圖形RAM
文件頁數(shù): 36/52頁
文件大小: 456K
代理商: IS42G32256
IS42G32256
36
Integrated Silicon Solution, Inc.
ADVANCE INFORMATION
SR037-0C
09/10/98
ISSI
Figure 20. Read and Write Cycle at Same Bank at Burst Length = 4
CLK
CKE
CS
RAS
CAS
A0-A8
WE
DSF
DQM
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
t
RP
Ra
Ca0
Cb0
Rb
Ra
Rb
A10
A9
t
QH
t
SAC
t
SHZ
RC
HIGH
NOTE 1
NOTE 2
NOTE 2
NOTE 3
NOTE 4
ROW ACTIVE
(A-BANK)
ROW ACTIVE
(A-BANK)
WRITE
(A-BANK)
READ
(A-BANK)
PRECHARGE
(A-BANK)
PRECHARGE
(A-BANK)
: DON’T CARE
DQ: CLOCK
LATENCY = 2
DQ: CLOCK
LATENCY = 3
Qa0
Qa1
Qa2
Qa3
Db0
Db1
Db2
Db3
Db0
Db1
Db2
Db3
Qa0
Qa1
Qa2
Qa3
t
RAC
t
QH
t
SAC
NOTE 3
RAC
t
SHZ
t
RDL
t
RDL
NOTE 4
Notes:
1. Minimum cycle time is required to complete internal DRAM operation.
2. Row precharge can interrupt burst on any cycle. [CAS Length = 1] valid output data available after Row enters
precharge. Last valid output will be Hi-Z after t
SHZ
from the clock.
3. Access time from Row address. t
CC
x (t
RCD
= CAS Latency = 1) + t
SAC
.
4. Output will be Hi-Z after the end of burst (1, 2, 4, and 8). At Full page bit burst, burst is wrap-around.
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