W83977F Datasheet, PDF (131/181 Pages) Winbond – PLUG & PLAY 1.0A COMPLIANT

W83977F/ W83977AF
Bit 2 : ENKBRTC
= 0 KBC and RTC are disabled after hardware reset.
= 1 KBC and RTC are active after hardware reset.
This bit is read only, and set/reset by hardware setting.
Bit 1 : ENPNP
= 0 Disable Comply PnP
= 1 Enable Comply PnP
Bit 0 : PNPCSV
= 0 The Compatible and Comply PnP has default value
= 1 The Compatible and Comply PnP has no default value
PRELIMINARY
CR25 (Default 0x00)
Bit 7-6 : Reserved
Bit 5 : URBTRI
Bit 4 : URATRI
Bit 3 : PRTTRI
Bit 2 : IRTRI [W83977AF only]
Bit 1 : Reserved.
Bit 0 : FDCTRI.
CR26 (Default 0b0s000000)
Bit 7 : SEL4FDD
= 0 Select two FDD mode.
= 1 Select four FDD mode.
Bit 6 : HEFRAS
These two bits define how to enable Configuration mode.
HEFRAS Address and Value
= 0 Write 87h to the location 3F0h twice.
= 1 Write 87h to the location 370h twice.
Bit 5 : LOCKREG
= 0 Enable R/W Configuration Registers.
= 1 Disable R/W Configuration Registers.
Bit 4 : DSIRLGRQ [W83977AF only]
= 0 Enable IR legacy mode on IRQ and DRQ selection, then MCR register bit 3 is effective
in selecting IRQ and DRQ.
= 1 Disable IR legacy mode on IRQ and DRQ selection, then MCR register bit 3 is not
effective in selecting IRQ and DRQ.
Bit 3 : DSFDLGRQ
= 0 Enable FDC legacy mode on IRQ and DRQ selection, then DO register bit 3 is effective
in selecting IRQ
= 1 Disable FDC legacy mode on IRQ and DRQ selection, then DO register bit 3 is not
effective in selecting IRQ
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Publication Release Date: March 1998
Revision 0.58