W83877 Winbond Electronics Corp America, W83877 Datasheet - Page 94

• Manufacturer Part Number: W83877
• Description: Winbond I/O
• Manufacturer: Winbond Electronics Corp America

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.
IRIDE (bit 1):
The corresponding power-on setting pin is SOUTA (pin 38).
HEFRAS (bit 0): combines with HEFERE (CR0C bit 5) to define how to access Extended Function
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:
PnP register
0
1
CR1E
CR20
CR21
CR22
CR23
CR24
CR25
CR26
CR27
CR28
CR29
pin
91
94
95
1
pins 1, 91, 94, 95 function as IDE ports.
pins 1, 91, 94, 95 function as IR ports.
Registers (refer to CR0C bit 5 description). The corresponding power-on setting pin
is NDTRA (pin 35).
IRIDE = 0
NRSTIDE
NIDBEN
NCS0
NCS1
PNPCVS = 1
FCH
FDH
DEH
BEH
7CH
FEH
81H
23H
65H
43H
62H
IRIDE = 1
IRQ_G
IRQ_H
IRRX2
IRTX2
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PNPCVS = 0
00H
00H
00H
00H
00H
00H
00H
00H
00H
00H
00H
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