W83977F Datasheet, PDF (134/181 Pages) Winbond – PLUG & PLAY 1.0A COMPLIANT

Bit 5-4 : PIN119S1, PIN119S0
= 00 NDACK0
= 01 GP16
= 10 8042 P15
= 11 nRTSC
Bit 3-2 : PIN104S1, PIN104S0
= 00 IRQ15
= 01 GP15
= 10 WDTO
= 11 IRSL2 [W83977AF only]
Bit 1-0 : PIN103S1, PIN103S0
= 00 IRQ14
= 01 GP14
= 10 PLEDO
= 11 IRSL1 [W83977AF only]
CR2D (Default 0x00)
Test Modes: Reserved for Winbond.
CR2E (Default 0x00)
Test Modes: Reserved for Winbond.
CR2F (Default 0x00)
Test Modes: Reserved for Winbond.
W83977F/ W83977AF
PRELIMINARY
10.2 Logical Device 0 (FDC)
CR30 (Default 0x01)
Bit 7-1 : Reserved.
Bit 0 : = 1 Activates the logical device.
= 0 Logical device is inactive.
CR31
Bit 7-2 : Reserved.
Bit 1 : ENRNGCK -- > Enable I/O Range check
Bit 0 : FORIORD --> Forces LDN to respond I/O read
CR60, CR 61 (Default 0x03, 0xf0)
These two registers select FDC I/O base address [0x100:0xFF8] on 8 byte boundaries.
CR70 (Default 0x06)
Bit 7-4 : Reserved.
Bit 3-0 : These bits select IRQ resource for FDC.
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Publication Release Date: March 1998
Revision 0.58