W83877TF Datasheet, PDF (116/154 Pages) Winbond – I/O chip disk drive adapter

W83877TF
The corresponding power-on setting pin is NRTSA (pin 36).
PnP register
PNPCVS = 1
PNPCVS = 0
CR20
FCH
00H
CR23
DEH
00H
CR24
FEH
00H
CR25
BEH
00H
CR26
23H
00H
CR27
05H
00H
CR28
43H
00H
CR29
60H
00H
Note: The new value of PNPCVS must be complementary to the old one to make an effective change. For example, the user must
set PNPCVS to 1 first and then reset it to 0 to reset these PnP registers if the present value of PNPCVS is 0.
Bit 1: Reserved.
HEFRAS (Bit 0): combines with HEFERE (bit 5 of CR0C) to define how to access Extended Function
Registers (refer to bit 5 of CR0C description). The corresponding power-on setting
pin is NDTRA (pin 35).
8.2.23 Configuration Register 17 (CR17), default = 00H
When the device is in Extended Function mode and EFIR is 17H, the CR17 register can be accessed
through EFDR. The bit definitions are as follows:
765 43 ²¹ 0
Bit 7-bit 5: Reserved.
DSUBLGRQ
DSUALGRQ
DSPRLGRQ
DSFDLGRQ
PRIRQOD
reserved
reserved
reserved
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Publication Release Date: March 1998
Version 0.61