w83977atf Winbond Electronics Corp America, w83977atf Datasheet - Page 18

• Manufacturer Part Number: w83977atf
• 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)
KBLOCK
GP13
INDEX
RDATA
WP
TRAK0
SYMBOL
SYMBOL
59
60
67
68
56
57
58
PIN
PIN
17
6
7
8
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
I/O
IN
IN
IN
IN
IN
I/O
I/O
16u
16u
16u
16u
cs
cs
cs
cs
12t
12t
12t
12t
16t
ts
The read data input signal from the FDD. This input pin is pulled
up internally by a 1 K
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
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.
This input pin is pulled up internally by a 1 K
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
(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.
W83C45 KINH (P17) Input. (CR2B bit 0 = 0, default)
General purpose I/O port 1 bit 3. (CR2B bit 0 = 1)
resistor. The resistor can be disabled by bit 7 of L0-CRF0
-17 -
resistor. The resistor can be disabled by
FUNCTION
FUNCTION
Publication Release Date: April 1998
resistor. The resistor can be
W83977ATF
PRELIMINARY
resistor. The
Revision 0.52