Siemens 100-8D Technical Manual page 41

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LOGIC LSI CHIP
THIS LOGIC CHIP IS A SEMI-CUSTOM LSI 22-PIN INTEG RAT ED CIRCUIT. THE CHIP USES C-MOS FET PAIRS AS
BU IL D IN G BLOCKS FOR GE NE RA TIN G THE RE QUIRED LOGIC FUNCTIONS. TH E C-MOS REQUIRES L IT T LE
CURRENT AN D IS INSENSITIVE TO NOISE. A L L OUTPUTS W I L L SINK 2.0 MILL1AMPERES. A L L INPUTS
REQUIRE 0.2 MIL LIA M PE R E S TO BE D RI VE N AN D THE INPUT AND OUTPUT SIGNALS AN D PINS ARE
IDE N TI F IE D AS SHOWN AND AS LISTED BELOW.
PIN INPUTS
PIN OUTPUTS
1
LTRK 00
4
+5V
5 SELECT
7
LSTEP
8
STEP INH IBIT
11
10 STEP OPT
16 T R K 00
12 SEL OPT
20
13
LHDLD
22
14
DOOR CLOSED
15
POR
17
INDEX
18
GND
19 STEP IN
21
PHASE OPT
INPUTS - THE D E R I V A T IO N OF THE INPUTS IS EX PL AIN ED IN OTHER SECTIONS OF THIS MA N UA L .
OUTPUTS - A BRIEF DESCRIPTION OF A L L OUTPUTS A N D THEIR EQUATION IS LISTED BELOW.
HDLD =
(LHD LD) (SEL OPT) (DOOR CLOSED)
READ/ WR ITE HEAD LOADED IF DR IV E IS SELECTED, IF A HEAD LOAD COMMAND IS
RECEIVED, AND PROVIDED T H A T THE ACCESS DOOR IS CLOSED
T R K 0 0
=
( L TR K 00) (PHASE A)
TR AC K 00 S IG NAL SENT TO CON TR OLL ER IF OPTICAL SWITCH INDICATES T H A T CA RRIAGE
BETWEEN T R A C K 00 AN D TR AC K 1-1/2, AN D T H A T PHASE A OUTPUT IS PRESENT
STEP =
(STEP OPT! (LSTEP! (STEP INH IBIT)
STEP OUTPUT A CT IVE IF STEP OPT AN D LSTEP BOTH AC TIV E AND NOT DISABLED BY STEP
INH IBIT
RDY =
(PORI (DOOR CLOSED) (TWO INDEX PULSES)
READY IS INACTIVE, HIGH, DURING POWER-ON AND IF DOOR IS OPEN
READY IS ACTIVE, LOW, IF POWER IS APPLIED WITH DOOR CLOSED, FOLLOWING TWO
INDEX PULSES AT INPUT
PHASE A
=
A C TIV E AT TRA CK 00 WITH PHASE OPT HIGH. PHASE A AC TIV E EVERY TH IR D TRACK
(0, 3, 6, ETC)
PHASE B
=
AC TIV E AT TRACKS 1, 4, 7, ETC
PHASE C
=
ACT IVE A T TRACKS 2, 5, 8, ETC
F i g u r e 3 - 8 .
2 PHASE C
3
RDY
6
STEP
9
DISK CHG
HDLD
PHASE A
PHASE B
L o g i c S y m b o l o g y ( S h e e t 2 o f Z\
3 - 1 2
+5V
5
SELECT
1 7
3
INDEX
RDY
STEP
DISK CHG
IN H IB IT
10
20
PHASE A
STEP OPT
22
19
PHASE B
STEP IN
2
15
PHASE C
POR
12
SEL OPT
7 --------
IMI 4060 2
LSTEP
13
16
TRK 00
LHDLD
14
DOOR CLOSED
-
ST tP ------
LTRK 00
11
21
PHASE OPT
HDLD
18

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