W90220F Winbond Electronics Corp America, W90220F Datasheet - Page 33
W90220F
Manufacturer Part Number
W90220F
Description
Pa-risc Embedded Controller
Manufacturer
Winbond Electronics Corp America
Datasheet
1.W90220F.pdf
(79 pages)
- Current page: 33 of 79
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The above information is the exclusive intellectual property of Winbond Electroncs Corp. and shall not be dsiclosed or distributed or reproduced without permission from
Winbond.
33
RAM Configuration_2 Register (RAMconf2)
Index : 0x2a
Bits 0-1 RAS# precharge time (RASPC[0:1])
0
RASPC[0:1]
"RASPC[0:1]" determine RAS# precharge-time during every "DRAM " cycles.
(Table 5.2.1-4. CAS# precharge-time during "read cycle")
(Table 5.2.1-5. CAS# active-time during "read cycle")
(Table 5.2.1-6. RAS# precharge-time during "DRAM cycle")
FW, CASRD[0:1]
RASPC[0:1]
FR, CASPC
1
1 0 0
1 0 1
1 1 0
1 1 1
0 0 0
0 0 1
0 1 0
0 1 1
1 0
1 1
0 0
0 1
0 0
0 1
1 0
1 1
CASPC
Read/Write
2
CASWR
CAS# precharge-time
RAS# precharge-time
3
CAS# active-time
(SYSCLK)
(SYSCLK)
(SYSCLK)
0.5
0.5
0.5
1.5
2.5
3.5
1
2
1
2
3
4
2
3
4
5
4
R2CRD[0:1]
Power-on Default : 0x15
5
6
R2CWR[0:1]
7
W90220F
Version 0.84
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