VT8231 datasheet(56/132 Pages) ETC

56 / 132 page

VT8231

Preliminary Revision 0.8 October 29, 1999

-50-

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Super-I/O I/O Ports

Floppy Disk Controller Registers

These registers are located at I/O ports which are offsets from

“FDCBase” (index C3h of the Super-I/O configuration

registers). FDCBase is typically set to allow these ports to be

accessed at the standard floppy disk controller address range

of 3F0-3F7h.

Port FDCBase+2 – FDC Command .................................RW

Motor 3 (unused in VT8231: no MTR3# pin)

Motor 2 (unused in VT8231: no MTR2# pin)

Motor 1

Motor Off

Motor On

Motor 0

Motor Off

Motor On

DMA and IRQ Channels

Disabled

1Enabled

FDC Reset

Execute FDC Reset

1FDC Enabled

1-0

Drive Select

00 Select Drive 0

01 Select Drive 1

1x -reserved-

Port FDCBase+4 – FDC Main Status...............................RO

Main Request

Data register not ready

Data register ready

Data Input / Output

CPU => FDC

FDC => CPU

Non-DMA Mode

FDC in DMA mode

FDC not in DMA mode

FDC Busy

FDC inactive

FDC active

3-2

Reserved

........................................ always reads 0

Drive 1 Active

Drive inactive

Drive performing a positioning change

Drive 0 Active

Drive inactive

Drive performing a positioning change

Port FDCBase+4 – FDC Data Rate Select ...................... WO

Port FDCBase+5 – FDC Data.......................................... RW

Port FDCBase+7 – FDC Disk Change Status.................. RO

Disk Change

Floppy not changed

Floppy changed since last instruction

6-3

Undefined

......................................... always read 1

2-1

Data Rate

00 500 Kbit/sec (1.2MB 5” or 1.44 MB 3” drive)

01 300 Kbit/sec (360KB 5” drive)

10 250 Kbit/sec (720KB 3” drive)

11 1 Mbit/sec

High Density Rate

500 Kbit/sec or 1 Mbit/sec selected

250 Kbit/set or 300 Kbit/sec selected

Port FDCBase+7 – FDC Configuration Control............ WO

7-2

Undefined

......................................... always read 1

1-0

Data Rate

00 500 Kbit/sec (1.2MB 5” or 1.44 MB 3” drive)

01 300 Kbit/sec (360KB 5” drive)

10 250 Kbit/sec (720KB 3” drive)

11 1 Mbit/sec

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