W83627F Information Storage Devices, Inc, W83627F Datasheet - Page 85

• Manufacturer Part Number: W83627F
• Description: LPC Interface I/o Plus Kbc, Game Port, Midi Port
• Manufacturer: Information Storage Devices, Inc

CRF1 (Default 0x00)
CRF2 (Default 0xFF)
CRF4 (Default 0x00)
FDD0 Selection:
Bit 7 - 6 : Boot Floppy
Bit 5, 4 : Media ID1, Media ID0. These bits will be reflected on FDC's Tape Drive Register bit 7, 6.
Bit 3 - 2 : Density Select
Bit 1
Bit 0
Bit 7 - 6 : FDD D Drive Type
Bit 5 - 4 : FDD C Drive Type
Bit 3 - 2 : FDD B Drive Type
Bit 1 - 0 : FDD A Drive Type
Bit 7
Bit 6
Bit 5
Bit 4 - 3 : DRTS1, DRTS0: Data Rate Table select (Refer to TABLE A).
Bit 2
Bit 1:0
= 00 FDD A
= 01 FDD B
= 10 FDD C
= 11 FDD D
= 00 Normal (Default)
= 01 Normal
= 10 1 (Forced to logic 1)
= 11 0 (Forced to logic 0)
: DISFDDWR
= 0 Enable FDD write.
= 1 Disable FDD write(forces pins WE, WD stay high).
: SWWP
= 0 Normal, use WP to determine whether the FDD is write protected or not.
= 1 FDD is always write-protected.
: Reserved.
: Precomp. Disable.
= 1
= 0
: Reserved.
= 00 Select Regular drives and 2.88 format
= 01 3-mode drive
= 10 2 Meg Tape
= 11 Reserved
: Reserved.
: DTYPE0, DTYPE1: Drive Type select (Refer to TABLE B).
Disable FDC Precompensation.
Enable FDC Precompensation.
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Publication Release Date:November 2002
W83627HF/F
Revision 2.0