W83627THF_06 Datasheet, PDF (90/142 Pages) Winbond – Winbond LPC I/O

W83627THF/W83627THG
CRF1 (Default 0x00)
Bit 7 - 6 : Boot Floppy
= 00 FDD A
= 01 FDD B
= 10 FDD C
= 11 FDD D
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
= 00 Normal (Default)
= 01 Normal
= 10 1 (Forced to logic 1)
= 11 0 (Forced to logic 0)
Bit 1 : DISFDDWR
= 0 Enable FDD write.
= 1 Disable FDD write(forces pins WE, WD stay high).
Bit 0 : SWWP
= 0 Normal, use WP to determine whether the FDD is write protected or not.
= 1 FDD is always write-protected.
CRF2 (Default 0xFF)
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
CRF4 (Default 0x00)
FDD0 Selection:
Bit 7 : Reserved.
Bit 6 : Pre-comp. Disable.
= 1 Disable FDC Pre-compensation.
= 0 Enable FDC Pre-compensation.
Bit 5 : Reserved.
Bit 4 - 3 : DRTS1, DRTS0: Data Rate Table select (Refer to TABLE A).
= 00 Select Regular drives and 2.88 format
= 01 3-mode drive
= 10 2 Meg Tape
= 11 Reserved
Bit 2 : Reserved.
Bit 1:0 : DTYPE0, DTYPE1: Drive Type select (Refer to TABLE B).
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Publication Release Date: September 26, 2006
Revision 1.2