W90220F Winbond Electronics Corp America, W90220F Datasheet - Page 32

• 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.
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Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
DRAM bank_1 enable
DRAM bank_0 enable
Swap out 0xA0000 ~ 0xFFFFF
When this bit is set to a logic 1, address space 0xA0000 ~ 0xFFFFF will not be recognized as
"system" DRAM space.
Fast Write Enable (FW)
"FW" together with RAMconf2[2:3] ("CASPC, CASWR") determine CAS# precharge- and
active-time during "DRAM write" cycles.
Fast Read Enable (FR)
"FR" together with RAMconf2[2] ("CASPC") and RAMconf3[6:7] ("CASRD[0:1]") deter-
mine CAS# precharge- and active-time during "DRAM read" cycles.
(Table 5.2.1-2 CAS# precharge-time during "write cycle")
(Table 5.2.1-3. CAS# active-time during "write cycle")
0 = Disable
1 = Enable
0 = Disable
1 = Enable
0 = Disable
1 = Enable
FW, CASWR
FW, CASPC
1 0
1 1
0 0
0 1
1 0
1 1
0 0
0 1
CAS# precharge-time
CAS# active-time
(SYSCLK)
(SYSCLK)
0.5
0.5
0.5
1.5
1
2
1
2
W90220F
Version 0.84