W83977EF-AW datasheet(34/142 Pages) WINBOND

Part #	W83977EF-AW

Description	WINBOND ISA I/O

Download	142 Pages

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Manufacturer	WINBOND [Winbond]

Direct Link	http://www.winbond.com

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W83977EF-AW/W83977EG-AW

-32-

(20) Invalid

PHASE

R/W

D7

D6

D5

D4

D3

D2

D1

D0

REMARKS

Command

W

------------- Invalid Codes -----------------

Invalid codes (no operation-

FDC goes to standby state)

Result

R

-------------------- ST0 ----------------------

ST0 = 80H

5.2 Register Descriptions

There are several status, data, and control registers in W83977EF. These registers are defined below:

ADDRESS

REGISTER

OFFSET

READ

WRITE

base address + 0

base address + 1

base address + 2

base address + 3

SA REGISTER

SB REGISTER

TD REGISTER

DO REGISTER

TD REGISTER

base address + 4

MS REGISTER

DR REGISTER

base address + 5

DT (FIFO) REGISTER

base address + 7

DI REGISTER

CC REGISTER

5.2.1

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:

1

2

3

4

5

6

7

0

WP#

INDEX#

HEAD

TRAK0#

STEP

DRV2#

INIT PENDING

DIR

INIT PENDING (Bit 7):

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

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.

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