FDC37B727-NS Standard Microsystems (SMSC), FDC37B727-NS Datasheet - Page 174

• Manufacturer Part Number: FDC37B727-NS
• Manufacturer: Standard Microsystems (SMSC)

Specifications of FDC37B727-NS

• Pin Count: 128
• Lead Free Status / RoHS Status: Compliant

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
NAME
Table 68 - Floppy Disk Controller, Logical Device 0 [Logical Device Number = 0x00]
REG INDEX
0xF0 R/W
0xF1 R/W
Bit[1] FDC DMA Mode
= 0
= 1
Bit[3:2] Interface Mode
= 11
= 10
= 01
= 00
Bit[4] Swap Drives 0,1 Mode
= 0
= 1
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[3:2] Density Select
= 00
= 01
= 10
= 11
Bit[5:4] Reserved, set to zero
Bits[7:6] Boot Floppy
= 00
= 01
= 10
= 11
Bit[0] Floppy Mode
Bits[1:0] Reserved, set to zero
= 0
= 1
Normal Floppy Mode (default)
Enhanced Floppy Mode 2 (OS2)
Burst Mode is enabled
Non-Burst Mode (default)
AT Mode (default)
(Reserved)
PS/2
Model 30
No swap (default)
Drive and Motor sel 0 and 1 are swapped.
Normal (default)
Normal (reserved for users)
1 (forced to logic "1")
0 (forced to logic "0")
FDD 0 (default)
FDD 1
Reserved (neither drive A or B is a boot
drive).
Reserved (neither drive A or B is a boot
drive).
175
DEFINITION
STATE
C
C