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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 39/44頁 |
| 文件大?。?/td> | 479K |
| 代理商： | MSM54C865-70 |
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MSM54C865
Semiconductor
39/44
DATA TRANSFER OPERATION
The MSM54C865 features two types of bidirectional data transfer capability between RAM and
SAM, as shown in Figure 1 below.
1) Conventional (non split) transfer : 256 words by 8 bits of data can be loaded from RAM to SAM
(Read transfer) or from SAM to RAM (write transfer).
2) Split transfer : 128 words by 8 bits of data can be loaded from the lower/upper half of the RAM
to the lower/upper half of the SAM (Split read transfer) or from the lower/upper half of SAM
to the lower/upper half of RAM (Split write transfer).
The conventional transfer and split transfer modes are controlled by the DSF input signal.
256
￥
256
￥
8
Memory
Array
256
￥
8
256
￥
128
￥
8
Memory
Array
128
￥
8
256
￥
128
￥
8
Memory
Array
128
￥
8
1) Conventional Transfer
2) Split Transfer
Figure 1.
The MSM54C865 supports five types of transfer operation : Read transfer, Split read transfer,
Write transfer, Pseudo write transfer and Split write transfer as shown in truth table. Data
transfer is invoked by holding the
DT
/
OE
signal "low" at the falling edge of
RAS
. The type of
transfer operation is determined by the state of
CAS
,
WB
/
WE
,
SE
and DSF latched at the falling
edge of
RAS
. During conventional transfer operations, the SAM port is switched from input to
output mode (Read transfer) or output to input mode (Write/Pseudo write transfer) whereas it
remains unchanged during split transfer operation (Split read transfer or Split write transfer).
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| MSM54C865-70JS | 65,536-Word X 8-Bit Multiport DRAM |
| MSM54C865-70ZS | 65,536-Word X 8-Bit Multiport DRAM |
| MSM54C865-80 | 65,536-Word X 8-Bit Multiport DRAM |
| MSM54C865-80JS | 65,536-Word X 8-Bit Multiport DRAM |
| MSM54C865-80ZS | 65,536-Word X 8-Bit Multiport DRAM |
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| MSM54V12222A-30TS-K | 制造商:OKI Semiconductor 功能描述:FIELD/FRAME/LINE MEMORY, 44 Pin, Plastic, TSOP |
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