Registers reset to their default values only on
hard resets generated by Vcc or VTR POR (as
shown) or the RESET_DRV signal. These
registers are not affected by soft resets.
SMSC Defined Logical Device Configuration
Registers
The
SMSC
Specific
Logical
Device
Configuration
Table 59 - Floppy Disk Controller, Logical Device 0 [Logical Device Number = 0x00]
NAME
REG INDEX
DEFINITION
STATE
FDD Mode Register
0xF0 R/W Bit[0] Floppy Mode
C
= 0 Normal Floppy Mode (default)
= 1 Enhanced Floppy Mode 2 (OS2)
Bit[1] FDC DMA Mode
Default = 0x0E
on Vcc POR or
Reset_Drv
= 0
= 1
Burst Mode is enabled
Non-Burst Mode (default)
Bit[3:2] Interface Mode
= 11
= 10
= 01
= 00
AT Mode (default)
(Reserved)
PS/2
Model 30
Bit[4] Swap Drives 0,1 Mode
= 0
= 1
No swap (default)
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.
137
SMSC [ SMSC CORPORATION ]
