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MNEMONIC
OPIRQ-L
OP~S
OPRHW-L
OQAL-L
Functional Description
7936 and 7937
Table 5-1. List of Mnemonics (6 of 23)
SIGNAL
Data Path
Interrupt
Request**
Dedicated
Servo
Position
Error*
Data Path
Read High,
Write Low
Decrease
Qualification
Level**
SOURCE
iii
A2
IJA1
IiA6
DESCRIPTION
READ/WRITE CONTROLLER Data Path
Control Bus handshake line to INTERRUPT
CONTROLLER in controller PCA-A6. When
activated
by
the
READ/WRITE
CONTROLLER,
OPIRQ-L
interrupts the con-
troller on a fault condition. The line is assert-
ed with the rising edge of Start of Sector
(SOS-L),
at the end of the sector in which a
fault is detected.
OPIRQ-L
can be monitored at pin 6 of the
read/write test point PCA.
OPI RQ-L
is connected to controller PCA-A6
via connectors A2J 1 and A6P 1.
Dedicated
servo
POSITION
DEMODULA TOR output.
OP~S
is dedicated
servo code A dibits minus dedicated servo
code B dibits.
OP~S
can be monitored at pin 47 of the ser-
vo test point PCA.
Data Path Control Bus handshake line from
the DATA PATH CONTROL INTERFACE.
The low state enables address or control
registers
in
the
READ/WRITE
CONTROLLER to accept data. The high
state enables status or address registers to be
read.
OPRHW-L
is
connected
to
the
READ/WRITE CONTROLLER in read/write
PCA-A2 via connectors A6Pl and A2JI .
Bit 6 of the READ/WRITE CONTROLLER
address register. Signal is used for diagnostic
testing only.
OQAL-L
can be monitored at pin 15 of the
read/write test point peA.
5-53
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