W83977F Datasheet, PDF (27/181 Pages) Winbond – PLUG & PLAY 1.0A COMPLIANT

W83977F/ W83977AF
PRELIMINARY
1.6 FDC Interface
SYMBOL
DRVDEN0
DRVDEN1
GP10
(IRQIN1)
P12
DSRC
HEAD
WE
WD
STEP
DIR
MOB
DSA
DSB
MOA
DSKCHG
RDATA
WP
TRAK0
PIN I/O
FUNCTION
2 OD₂₄ Drive Density Select bit 0.
3 OD₂₄ Drive Density Select bit 1.
Alternate Function 1: General purpose I/O port 1, bit 0. It can be
configured as an interrupt channel.
Alternate Function 2: Keyboard P12 I/O port.
Alternate Function 3: DSR input of UART C [W83977AF only]
5 OD₂₄ ^{Head select. This open drain output determines which disk drive}
head is active.
9 OD₂₄ ^{LWorgitiec e1n=abslied.e A0;n Loopgeinc d0ra=insidoeut1put.}
10 OD₂₄ ^{Write data. This logic low open drain writes precompensation serial}
data to the selected FDD. An open drain output.
11 OD₂₄ ^{Step output pulses. This active low open drain output produces a}
pulse to move the head to another track.
12 OD₂₄ ^{Direction of the head step motor. An open drain output.}
Logic 1 = outward motion; Logic 0 = inward motion
13 OD₂₄ Motor B On. When set to 0, this pin enables disk drive 1. This is an
open drain output.
14 OD₂₄ ^{Drive Select A. When set to 0, this pin enables disk drive A. This is}
an open drain output.
15 OD₂₄ Drive Select B. When set to 0, this pin enables disk drive B. This is
an open drain output.
16 OD₂₄ ^{Motor A On. When set to 0, this pin enables disk drive 0. This is an}
open drain output.
4 IN_cs ^{Diskette change. This signal is active low at power on and when the}
diskette is removed. This input pin is pulled up internally by a 1 KΩ
resistor, which can can be disabled by bit 7 of L0-CRF0
(FIPURDWN).
6 IN_cs ^{The read data input signal from the FDD. This input pin is pulled up}
internally by a 1 KΩ resistor, which can be disabled by bit 7 of L0-
CRF0 (FIPURDWN).
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, which can be disabled by bit 7 of L0-
CRF0 (FIPURDWN).
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, which can be disabled by bit
7 of L0-CRF0 (FIPURDWN).
Publication Release Date: March 1998
-16-
Revision 0.58