W90220F Winbond Electronics Corp America, W90220F Datasheet - Page 30

• 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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These eight 8-bit registers (boundle to four 16-bit registers) defines the most significant 16 bits
of each RAM banks' base (bottom) address. The "RAM base address" togather with the "RAM
size" (defined in ROMconf0) construct the whole address range of each RAM banks.
The base address of all four DRAM banks have no default value after power-on reset. It is software's
responsibility to well program these registers before access system DRAM.
RAM Configuration_0 Register (RAMconf0)
Index : 0x28
Bits 0-1 DRAM Bank 3's RAM type & Bank-size
0
0
RAMTP3
The following table defines how CPU address bus map to DRAM address :
RAMconf0[0:1]
MA11
MA10
MA9
MA8
MA7
MA6
1
1
0 0
0 1
1 0
1 1
ROW
*(A10)
*(A6)
*(A8)
A20
A19
A18
Read/Write
256K
2
2
RAMTP2
RAM type & Bank size (x32)
*(A18)
*(A19)
*(A20)
COL
A29
A28
A27
RAM base address bit 8-15
3
3
ROW
*(A6)
*(A8)
A10
A11
A19
A18
256K
16M
1M
4M
1M
*(A18)
*(A19)
COL
A20
A29
A28
A27
4
4
Power-on Default : 0x0
RAMTP1
ROW
*(A6)
A10
A11
A18
A8
A9
4M
5
5
*(A18)
COL
A19
A20
A29
A28
A27
ROW
A10
A11
A6
A8
A9
A7
6
6
RAMTP0
16M
COL
A18
A19
A20
A29
A28
A27
7
7
W90220F
Version 0.84