參數(shù)資料
型號: W83977TF(EOL)
英文描述: W83877TF plus KBC. CIR. RTC
中文描述: W83877TF加比聯(lián)。稅務(wù)局局長。時鐘
文件頁數(shù): 25/161頁
文件大?。?/td> 592K
代理商: W83977TF(EOL)
W83977EF/ CTF
PRELIMINARY
Publication Release Date: March 1999
-16 -
Revision A1
1.5 Multi-Mode Parallel Port, continued
SYMBOL
PIN
23
I/O
I/O
12t
FUNCTION
PD7
-
OD
12
PRINTER MODE: PD7
Parallel port data bus bit 7. Refer to description of the parallel
port for definition of this pin in ECP and EPP mode.
EXTENSION FDD MODE: This pin is a tri-state output.
EXTENSION 2FDD MODE: DSA2#
This pin is for Extension FDD A; its function is the same as the
DSA# pin of FDC.
1.6 FDC Interface
SYMBOL
PIN
I/O
FUNCTION
DRVDEN0
2
OD
24
OD
12
IO
12t
Drive Density Select bit 0.
DRVDEN1
GP10
(IRQIN1)
P12
SCI#
3
Drive Density Select bit 1. (CR2A bit 1_0 = 00, default)
General purpose I/O port 1 bit 0. (CR2A bit 1_0 = 01)
Alternate Function from GP10: Interrupt channel input.
KBC P12 I/O port. (CR2A bit 1_0 = 10)
System Control Interrupt (CR2A bit 1_0 = 11)
IO
12t
OUT
12t
OD
24
HEAD#
5
Head select. This open drain output determines which disk drive
head is active.
Logic 1 = side 0
Logic 0 = side 1
WE#
9
OD
24
OD
24
Write enable. An open drain output.
WD#
10
Write data. This logic low open drain writes pre-compensation
serial data to the selected FDD. An open drain output.
STEP#
11
OD
24
Step output pulses. This active low open drain output produces
a pulse to move the head to another track.
DIR#
12
OD
24
Direction of the head step motor. An open drain output.
Logic 1 = outward motion
Logic 0 = inward motion
MOB#
13
OD
24
Motor B On. When set to 0, this pin enables disk drive 1. This is
an open drain output.
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