参数资料
型号: IBM25403GCX-3JC76C2
元件分类: 微控制器/微处理器
英文描述: RISC PROCESSOR, PQFP16
封装: PLASTIC, QFP-160
文件页数: 41/54页
文件大小: 541K
代理商: IBM25403GCX-3JC76C2
IBM PowerPC 403GCX
46
DRAM Three-state - Refresh request before and after HoldAck
Bank Register Bit Settings
Note:
1. IOCR[EDT] is set.
SLF
ERM
Bus
Width
Ext
Mux
RAS-to-
CAS
Refresh
Mode
Page
Mode
First
Access
Burst
Access
Prechg
Cycles
Refresh
RAS
Refresh
Rate
x
10
0
x
0
x
0
xxxx
Cycle
SysClk
A6:29
WBE2/A30
WBE3/A31
HoldReq
1
2
3
4
5
6
7
8
9
10 11 12 13
HoldAck
RAS0:3
CAS0:3
DramWE,
14 15 16
DramOE,
R/W,
OE/XSize1,
EOT3/TC3/XSize0,
WBE0:3
F
E
F
0
F
D
F
F0
F
Bank 4 refresh request
gets in just before
HoldAck
External master has
control of bus;
refreshes held off until
out of HoldAck
Bank 5 refresh counter
expired while in
HoldAck. Refresh of
bank as soon as out of
HoldAck
F
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