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MNEMONIC
OOS-H
OEOP,
DE ON
DIDO,
0101
OLVL
OMP-H
SIGNAL
Disc Data
Strobe
Dedicated
Servo
Drive
ID
bits 0, 1
Dedicated
Level*
Dump
Functional DescriptIon
7936 and 7937
Table 5-1. List of Mnemonics (4 of 23)
SOURCE
IBIJ
A2
IBIJ
A2
fill
A3
fill
A1
fill
A1
DESCRIPTION
Disc Data Bus handshake line. The rising edge
of
OOS-H
from
the
READ/WRITE
CONTROLLER causes the driver of the bus
to output the next data byte, and the falling
edge causes the receiver on the bus to latch
the data byte.
OOS-H
is connected to the DMA/ECC cir-
cuitry in controller PCA-A6 via connectors
A2J! and A6PI.
DEDICATED SERVO AGC AMPLIFIER
differential output. The amplifier input is
differential Servo Data
(SOX, SOY),
from the
SERVO READ PREAMp/WRITE DRIVER
IC.
OEOP
and
DE ON
are connected to the input
of the DEDICATED SERVO FILTER in ser-
vo PCA-AI. See figure
fill.
DRIVE
10
outputs
to
SERVO
CONTROLLER. Signals identify the HDA
type (7936 or 7937).
When requested, the
SERVO CONTROLLER reports this informa-
tion to controller PCA-A6.
DIDO, 0101
are connected to the SERVO
CONTROLLER in servo PCA-Al via HDA
cable W8 and read/write PCA-A2.
Dedicated
servo
POSITION
DEMODULA TOR
output
to
the
AGC
INTEGRATOR. DLVL represents the sum of
the sampled servo code A and B dibits.
DL VL can be monitored at pin 9 of the servo
test point PCA.
DEDICATED SERVO TIMING and PLL
output
to
POSITION
DEMODULA TOR.
DMP·H controls the discharge of the posit.ion
demodulator sample-and-hold circuit.
5-51
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