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參數(shù)資料
| 型號(hào)： | MSM548262 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | 262,144-Word ×8-Bit Multiport DRAM(256k字×8位多端口動(dòng)態(tài)RAM) |
| 中文描述： | 262,144字× 8位多端口內(nèi)存（256k字× 8位多端口動(dòng)態(tài)RAM）的 |
| 文件頁數(shù)： | 29/37頁 |
| 文件大?。?/td> | 462K |
| 代理商： | MSM548262 |
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Semiconductor
MSM548262
29/37
OPERATION MODES
Table-1 shows the function truth table for a listing of all available RAM ports, and transfer
operation of MSM548262.
The RAM port and data transfer operations are determined by the state of
CAS
,
TRG
,
WE
and
DSF at the falling edge of
RAS
, and by the level of DSF at the falling edge of
CAS
.
Table-1. Function Truth Table
RAS
Code
Address
CAS TRG WE
DSF DSF
RAS
CAS
/
WE
Write
Mask
Color
Register
0
*
*
*
—
*
*
*
*
—
—
CBR
CAS
RAS
W/IO
CAS
Function
CBR Refresh
1
1
*
0
—
Row
—
*
—
—
—
ROR
RAS
Only Refresh
1
0
0
0
*
Row TAP WM1
*
Yes
—
MWT
Masked Write Transfer
1
0
0
1
*
Row TAP WM1
*
Yes
—
MSWT
Masked Split
Write Transfer
1
0
1
0
*
Row TAP
*
*
—
—
RT
Read Transfer
1
0
1
1
*
Row TAP
*
*
—
—
SRT
Split Read Transfer
1
1
0
0
0
Row
Column
WM1
Din, Dout
Yes
—
RWM
Read/Write
(Mask)
1
1
0
0
1
Row
Column
WM1
A2c - 8c
Yes
Use
BWM
Masked Block Write
1
1
0
1
*
Row
*
WM1
—
Yes
Use
FWM
Masked Flash Write
1
1
1
0
0
Row
Column
*
Din, Dout
No
—
RW
Read/Write
(No Mask)
Block Write
(No Mask)
1
1
1
0
1
Row
*
No
Use
BW
1
1
1
1
1
Row
*
*
—
Load
LCR
Load Color Register
Column
A2c - 8c
Column
Select
Column
Select
Color
Data
If the DSF is "high" at the falling edge of
RAS
, special functions such as split transfer, flash write,
load color register can be invoked.
If the DSF is "low" at the falling edge of
RAS
and "high" at the falling edge of
CAS
, the block write
feature can be invoked.
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|---|---|
| MSM548262-60JS | 制造商:ROHM Semiconductor 功能描述: |
| MSM548262-60T3-K | 制造商:ROHM Semiconductor 功能描述: |
| MSM548262-60TK | 制造商:OK International 功能描述: |
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