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Functional Description
7936 and 7937
MNEMONIC
GLED
HD1S-H,
HD2S-H
SIGNAL
Green LED
Head
Select 1, 2
Table 5-1. List of Mnemonics (9 of 23)
SOURCE
~A6
IilII
A2
DESCRIPTION
LED DRIVER output to green LED in front
panel LED display.
GLED
is connected to LED PCA-A 7 via
read/write
PCA-A2,
power
distribution
PCA-A5, and power supply output cable W4.
Two least significant bits of head address
from
the
address
register
in
the
READ/WRITE CONTROLLER. Output to
the HEAD SELECT ENCODER and the
HEAD
GAIN
REFERENCE
PROM
in
HDA-Al
HDS1-H
and
HDS2-H
are connected to the
PROM in HDA A3 via HDA cable W8.
HS1-H, HS2-H
Head
Select,
IDII
A2
HEAD SELECT ENCODER outputs which,
together
with
Chip
Enable
bits
CEO-L
through
CE3-L,
are decoded by the READ
PREAMP /WRITE DRIVER ICs to select the
desired read/write head.
bits 1,2
INDEX-H
Index*
LCK-L
Lock
5-56
IJA1
IJA1
HS1-H
and
HS2-H
are connected to the
READ PREAMP/WRITE DRIVER ICs in
HDA A3 via HDA cable W8.
SAMPLED SERVO TIMING output to con-
troller PCA-A6.
INDEX-H
represents one
rota tion of the spindle.
INDEX-H
can be monitored at pin 48 of the
servo test point PCA.
INDEX-H
is connected to controller PCA-A6
via read/write PCA-A2.
SERVO
CONTROLLER
output
to
DEDICATED SERVO TIMING and PLL.
LCK-L
facilitates lock-up of the dedicated
servo PLL.
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