W83877TF Datasheet, PDF(38/154 Page) Winbond – I/O chip disk drive adapter

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W83877TF Datasheet, PDF (38/154 Pages) Winbond – I/O chip disk drive adapter

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W83877TF

2.2 Register Descriptions

There are several status, data, and control registers in W83877TF. These registers are defined below:

ADDRESS

OFFSET

base address + 0

base address + 1

base address + 2

base address + 3

base address + 4

base address + 5

base address + 7

READ

WRITE

SA REGISTER

SB REGISTER

DO REGISTER

TD REGISTER

MS REGISTER

DR REGISTER

DT (FIFO) REGISTER

DI REGISTER

CC REGISTER

2.2.1 Status Register A (SA Register) (Read base address + 0)

This register is used to monitor several disk interface pins in PS/2 and Model 30 modes. In PS/2

mode, the bit definitions for this register are as follows:

7 6 5 4 3 21 0

INIT PENDING (Bit 7):

This bit indicates the value of the floppy disk interrupt output.

DIR

INDEX

HEAD

TRAK0

STEP

DRV2

INIT PENDING

DRV2 (Bit 6):

0 A second drive has been installed

1 A second drive has not been installed

STEP (Bit 5):

This bit indicates the complement of STEP output.

TRAK0 (Bit 4):

This bit indicates the value of TRAK0 input.

HEAD (Bit 3):

This bit indicates the complement of HEAD output.

0 side 0

1 side 1

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Publication Release Date: March 1998

Version 0.61

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