W90220F Winbond Electronics Corp America, W90220F Datasheet - Page 33

• Manufacturer Part Number: W90220F
• Description: Pa-risc Embedded Controller
• Manufacturer: Winbond Electronics Corp America

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