FDC37C672 View Datasheet(PDF) - SMSC -> Microchip
Part Name
Description
Manufacturer
FDC37C672 Datasheet PDF : 173 Pages
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Enhanced Super I/O Controller with Fast IR
Datasheet
Table 19.7 - Floppy Disk Controller, Logical Device 0 [Logical Device Number = 0x00]
NAME
FDD Mode Register
Default = 0x0E
on Vcc POR or
Reset_Drv
REG INDEX
0xF0 R/W
DEFINITION
Bit[0] Floppy Mode
= 0 Normal Floppy Mode (default)
= 1 Enhanced Floppy Mode 2 (OS2)
Bit[1] FDC DMA Mode
= 0 Burst Mode is enabled
= 1 Non-Burst Mode (default)
Bit[3:2] Interface Mode
= 11 AT Mode (default)
= 10 (Reserved)
= 01 PS/2
= 00 Model 30
Bit[4] Swap Drives 0,1 Mode
= 0 No swap (default)
= 1 Drive and Motor sel 0 and 1 are swapped.
Bit[5] Reserved, set to zero
Bit[6] FDC Output Type Control
= 0 FDC outputs are OD24 open drain (default)
= 1 FDC outputs are O24 push-pull
Bit[7] FDC Output Control
= 0 FDC outputs active (default)
= 1 FDC outputs tri-stated
Note: Bits 6 & 7 do not affect the parallel port FDC pins.
FDD Option Register
Default = 0x00
on Vcc POR or
Reset_Drv
FDD Type Register
Default = 0xFF
on Vcc POR or
Reset_Drv
0xF1 R/W
0xF2 R/W
Bits[1:0] Reserved, set to zero
Bits[3:2] Density Select
= 00 Normal (default)
= 01 Normal (reserved for users)
= 10 1 (forced to logic "1")
= 11 0 (forced to logic "0")
Bit[4] Media ID 0 Polarity
= 0: Don’t invert (default)
= 1: Invert
Bit[5] Media ID 1 Polarity
= 0: Don’t invert (default)
= 1: Invert
Bits[7:6] Boot Floppy
= 00 FDD 0 (default)
= 01 FDD 1
= 10 Reserved (neither drive A or B is a boot drive).
= 11 Reserved (neither drive A or B is a boot drive).
Bits[1:0] Floppy Drive A Type
Bits[3:2] Floppy Drive B Type
Bits[5:4] Reserved (could be used to store Floppy Drive C
type)
Bits[7:6] Reserved (could be used to store Floppy Drive D
type)
Note: The FDC37C672 supports two floppy drives
0xF3 R Reserved, Read as 0 (read only)
STATE
C
C
C
C
SMSC FDC37C672
Page 133
DATASHEET
Rev. 10-29-03
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