w83977tf Winbond Electronics Corp America, w83977tf Datasheet - Page 23

• Manufacturer Part Number: w83977tf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

1.6 FDC Interface, continued
1.7 KBC Interface
KDATA
MDATA
KCLK
MCLK
GA20
GP11
(IRQIN2)
KBRST
GP12
(WDTO)
MOA
DSKCHG
RDATA
INDEX
WP
TRAK0
SYMBOL
SYMBOL
59
60
67
68
56
57
PIN
PIN
16
17
4
6
7
8
I/OD
I/OD
I/OD
I/OD
OD
I/O
I/O
I/O
I/O
IN
IN
IN
IN
IN
I/O
I/O
cs
cs
cs
cs
cs
12t
12t
12t
12t
24
16u
16u
16u
16u
Motor A On. When set to 0, this pin enables disk drive 0. This is
an open drain output.
Diskette change. This signal is active low at power on and
whenever the diskette is removed. This input pin is pulled up
internally by a 1 K resistor. The resistor can be disabled by bit 7
of L0-CRF0 (FIPURDWN).
The read data input signal from the FDD. This input pin is pulled
up internally by a 1 K resistor. The resistor can be disabled by
bit 7 of L0-CRF0 (FIPURDWN).
Write protected. This active low Schmitt input from the disk drive
indicates that the diskette is write-protected. This input pin is
pulled up internally by a 1 K resistor. The resistor can be
disabled by bit 7 of L0-CRF0 (FIPURDWN).
Track 0. This Schmitt-triggered input from the disk drive is active
low when the head is positioned over the outermost track.
input pin is pulled up internally by a 1 K resistor. The resistor
can be disabled by bit 7 of L0-CRF0 (FIPURDWN).
This Schmitt-triggered input from the disk drive is active low when
the head is positioned over the beginning of a track marked by an
index hole. This input pin is pulled up internally by a 1 K resistor.
The resistor can be disabled by bit 7 of L0-CRF0 (FIPURDWN).
Keyboard Data
PS2 Mouse Data
Keyboard Clock
PS2 Mouse Clock
KBC GATE A20 (P21) Output. (CR2A bit 6 = 0, default)
General purpose I/O port 1 bit 1. (CR2A bit 6 = 1)
Alternate Function from GP11: Interrupt channel input.
W83C45 Keyboard Reset (P20) Output. (CR2A bit 7 = 0, default)
General purpose I/O port 1 bit 2. (CR2A bit 7 = 1)
Alternate Function 1 from GP12 : Watchdog timer output.
-15 -
FUNCTION
FUNCTION
Publication Release Date: April 1998
W83977TF
PRELIMINARY
Revision 0.62
This