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參數(shù)資料
| 型號： | UPD44165184F5-E50-EQ1 |
| 廠商： | NEC Corp. |
| 英文描述： | 18M-BIT QDRII SRAM 4-WORD BURST OPERATION |
| 中文描述： | 1800萬位推出QDRII SRAM的4個字爆發(fā)運(yùn)作 |
| 文件頁數(shù)： | 10/32頁 |
| 文件大?。?/td> | 392K |
| 代理商： | UPD44165184F5-E50-EQ1 |
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10
Data Sheet M15825EJ7V
1
DS
μ
PD44165084, 44165184, 44165364
Bus Cycle State Diagram
READ DOUBLE;
R_Count = R_Count+2
WRITE DOUBLE;
W_Count = W_Count+2
Power UP
Always
/R = H
Supply voltage
provided
LOAD NEW
READ ADDRESS;
R_Count = 0;
R_Init = 1
READ PORT NOP
R_Init = 0
/R = L & R_Count = 4
/W = H
WRITE PORT NOP
LOAD NEW
WRITE ADDRESS;
W_Count = 0
Always
/W = L & W_Count = 4
/W = L
R_Init = 0
/R = L
Supply voltage
provided
INCREMENT READ
ADDRESS BY TWO
R_Init = 0
INCREMENT WRITE
ADDRESS BY TWO
W_Count = 2
R_Count = 2
Always
Always
/W = H
& W_Count = 4
/R = H
& R_Count = 4
Remarks 1.
The address is concatenated with two additional internal LSBs to facilitate burst operation.
The address order is always fixed as: xxx...xxx+0, xxx...xxx+1, xxx...xxx+2, xxx...xxx+3.
Bus cycle is terminated at the end of this sequence (burst count = 4).
2.
Read and write state machines can be active simultaneously.
Read and write cannot be simultaneously initiated. Read takes precedence.
3.
State machine control timing is controlled by K.
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