W83977ATF Datasheet, PDF (18/207 Pages) Winbond – WINBOND I/O

W83977ATF
PRELIMINARY
1.6 FDC Interface, continued
SYMBOL PIN
I/O
FUNCTION
RDATA
6
IN_cs The read data input signal from the FDD. This input pin is pulled
up internally by a 1 KΩ resistor. The resistor can be disabled by
bit 7 of L0-CRF0 (FIPURDWN).
WP
7
IN_cs 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 KΩ resistor. The resistor can be
disabled by bit 7 of L0-CRF0 (FIPURDWN).
TRAK0
8
IN_cs 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 KΩ resistor. The
resistor can be disabled by bit 7 of L0-CRF0 (FIPURDWN).
INDEX
17
IN_cs 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 KΩ resistor. The resistor can be disabled by bit 7 of L0-CRF0
(FIPURDWN).
1.7 KBC Interface
SYMBOL
KDATA
MDATA
KCLK
MCLK
GA20
GP11
(IRQIN2)
KBRST
GP12
(WDTO)
KBLOCK
GP13
PIN
59
60
67
68
56
57
58
I/O
I/O_16u
I/O_16u
I/O_16u
I/O_16u
I/O_12t
I/O_12t
I/O_12t
I/O_12t
IN_ts
I/O_16t
FUNCTION
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)
Publication Release Date: April 1998
-17 -
Revision 0.52