FDC37B78X SMSC Corporation, FDC37B78X Datasheet - Page 187

• Manufacturer Part Number: FDC37B78X
• Description: Enhanced Super I/O Controller with ACPI Support/ Real Time Clock and Consumer IR
• Manufacturer: SMSC Corporation

SMSC Defined Logical Device Configuration Registers
The SMSC Specific Logical Device Configuration Registers reset to their default values only on hard
resets generated by Vcc POR or VTR POR or VBAT POR (as shown) or the RESET_DRV signal.
These registers are not affected by soft resets.
FDD Mode
Register
Default = 0x0E
on Vcc POR
or Reset_Drv
FDD Option
Register
Default = 0x00
on Vcc POR
or Reset_Drv
TABLE 76 - FLOPPY DISK CONTROLLER, LOGICAL DEVICE 0 [LOGICAL DEVICE NUMBER = 0X00]
NAME
REG INDEX
0xF0 R/W
0xF1 R/W
Bit[0] Floppy Mode
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.
Bits[5] Reserved, set to zero.
Bit [6] 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 tristated
Note: these bits do not affect the parallel port FDC pins.
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[5:4] Reserved, set to zero
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).
= 0Normal Floppy Mode (default)
= 1 Enhanced Floppy Mode 2 (OS2)
187
DEFINITION
STATE
C
C