Spectravideo MKI, Сервисное – Техническое руководство

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P IN
NO
.
1
1 9
20
2 1
40
PIN NAME
NO CONNECTION
MASTER RESET
POWER SUPPL I ES
COMPUTER INTERFACE :
2 WRITE ENABLE
3 CHIP SELECT
4 READ ENABLE
5 , REG ISTER SELECT
SYMBOL
N C
MR
Vs s
RE
AO , A 1
4 . 91
FUN CT ION
P in
1
i s inte rna l ly conne c t e d to a
back b i as genera tor and must be l e f t
open b y the use r .
A log ic low on this input re s e t s the
device and loads HEX 03 i nto the
command reg i s t e r . The Not Readr_
B i t
7 )
i s re s e t du ring MR
ACTIVE . When MR is b rought to a
l o g ic h igh a RESTORE Command i s
execu te d , reg ar d l e ss
o f
t he s t ate o f
the Re� dy s i gna l f rom the drive .
A l so , HEX 0 1 i s l oa de d into sec tor
reg i s t e r .
G round
+ 5V +-5%
+ 1 2V +-5%
A log ic low on th i s inpu t gates data
on th e DAL into the se l ec t e d reg i s t e r
when C S is low.
A logic low on th is input se l ec t s the
chip and enab l e s compu t e r communi­
ca t i on with the device .
A log ic low on th i s input cont ro l s the
p lacement of data f rom a se lected
reg i s t e r on the DAL when CS is· low .
The se inpu t s se l ect t he reg i s ter t o
rece ive t ra ns f er d a t a o n the DAL
l i nes und"e r RE and WE con t ro l :
- -
A1 AO RE WE
0 0 S t a tus Reg
Command Reg
0
1 Track Reg Track Reg
1
0
S e c tor Reg Sec tor Reg
1
1
Dat a Reg
Data Reg