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參數(shù)資料
| 型號(hào)： | MSM54C865-70 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | 65,536-Word X 8-Bit Multiport DRAM |
| 中文描述： | 65,536字× 8位多端口內(nèi)存 |
| 文件頁(yè)數(shù)： | 36/44頁(yè) |
| 文件大小： | 479K |
| 代理商： | MSM54C865-70 |
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MSM54C865
Semiconductor
36/44
OPERATION MODES
Table-1 shows the function truth table for a listing of all available RAM ports and transfer
operation of MSM54C865.
The RAM port and data transfer operations are determined by the state of
CAS
,
DT
/
OE
,
WB
/
WE
,
SE
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
WB
/
WE
DSF
SE
*
CAS DT
/
OE
0
CAS
DSF
—
ADDRESS
RAS
CAS
*
W/IO
RAS
CAS
CAS
/
WE
*
—
Write
Mask
Register
WM Color
—
Load
Use
Function
*
*
*
1
0
0
0
0
1
0
0
0
1
1
0
0
1
*
1
1
0
0
1
1
0
1
*
*
1
1
0
0
*
1
1
0
0
*
1
1
0
1
*
1
1
1
0
*
1
1
1
0
*
1
1
1
1
*
*
*
*
*
*
0
1
*
0
1
*
Row
Row
Row
Row
Row
Row
Row
Row
Row
Row
Row
—
TAP
TAP
TAP
TAP
TAP
Column
*
Column
Column
A2c-7c
*
WM1
*
WM1
*
*
WM1
WM1
WM1
*
*
*
*
*
—
*
*
—
—
—
—
—
*
*
*
*
*
Din
—
*
Din
—
Color
—
WM1
—
WM1
—
—
WM1
WM1
WM1
—
—
—
—
Load
Use
—
—
Load
Use
—
—
—
—
—
—
—
—
—
—
Use
Use
—
Use
Load
C.B.R Refresh
Masked Write Transfer
Pseudo Write Transfer
Split Write Transfer
Read Transfer
Split Read Transfer
Write per Bit
Masked Block Write
Masked Flash Write
Read Write
Block Write
Load Color Register
Column
A2c-7c
Column
Select
Column
Select
Load
Use
Load
Use
If the DSF is 'high" at the falling edge of
RAS
, special functions such as split transfer, flash write,
and load/read 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.
If the DSF is "low" at the falling edge of
RAS
and
CAS
, only the conventional multiport DRAM
operating feature can be invoked.
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