W83787IF Datasheet, PDF (117/123 Pages) Winbond – WINBOND I/O WITH SERIAL-INFRARED SUPPORT

B. W83877F Configuration Register
CR0D ~ CR15
Same as W83787IF
CR1E
This register is used to select the base address of Game Chip Select Decoder (GAMECS) from 100H - 3F0H on 16-byte
boundries. The default value is 81H. NCS=0 and A10=0 are required to qualify the GAMECS output.
bit 7 - bit 2: match A[9:4].
bit 1 - bit 0: CAMECS configuration.
00 GAMECS disable
01 1-byte decode, A[3:0] = 0001b
10 8-byte decode, A[3:0] = 0xxxb
11 16-byte decode, A[3:0] = xxxxb
CR20
This register is used to select the base address of the Floppy Disk Controller (FDC) from 100H - 3F0H on 16-byte
boundries. The default value is FCH. NCS=0 and A10=0 are required to access the FDC registers. A[3:0] are always
decoded as 0xxxb.
bit 7 - bit 2: match A[9:4]. Bit 7=0 and bit 6=0 disable this decode.
bit 1 - bit 0: fixed at zero.
CR21
This register is used to select the base address of the IDE Interface Control Registers from 100H - 3F0H on 16-byte
boundries. The default value is 7CH. NCS=0 and A10=0 are required to access the IDE registers. A[3:0] are always
decoded as 0xxxb.
bit 7 - bit 2: match A[9:4]. Bit 7=0 and bit 6=0 disable this decode.
bit 1 - bit 0: fixed at zero.
877/787I APN 3
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