W83877TF Datasheet, PDF (121/154 Pages) Winbond – I/O chip disk drive adapter

W83877TF
URAAD7-URAAD1 (Bit 7-bit 1): match A[9:3]. Bit 7 = 0 and bit 6 = 0 disable this decode.
Bit 0: Reserved, fixed at zero.
8.2.29 Configuration Register 25 (CR25)
When the device is in Extended Function mode and EFIR is 25H, the CR25 register can be accessed
through EFDR. Default = BEH if CR16 bit 2 = 1; default = 00H if CR16 bit 2 = 0. The bit definitions
are as follows:
765
43
21
0
reserved
URBAD1
URBAD2
URBAD3
URBAD4
URBAD5
URBAD6
URBAD7
This register is used to select the base address of the UART B from 100H-3F8H on 8-byte
boundaries. NCS = 0 and A10 = 0 are required to access the UART B registers. A[2:0] are don't-care
conditions.
URBAD7-URBAD1 (Bit 7-bit 1): match A[9:3]. Bit 7 = 0 and bit 6 = 0 disable this decode.
Bit 0: Reserved, fixed at zero.
8.2.30 Configuration Register 26 (CR26)
When the device is in Extended Function mode and EFIR is 26H, the CR26 register can be accessed
through EFDR. Default = 23H if CR16 bit 2 = 1; default = 00H if CR16 bit 2 = 0. The bit definitions are
as follows:
765
43
21
0
PRTDQS0
PRTDQS1
PRTDQS2
PRTDQS3
FDCDQS0
FDCDQS1
FDCDQS2
FDCDQS3
FDCDQS3-FDCDQS0 (Bit 7-bit 4): Allocate DMA resource for FDC.
PRTDQS3-PRTDQS0 (Bit 3-bit 0): Allocate DMA resource for PRT.
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Publication Release Date: March 1998
Version 0.61