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|  MIL-D-81347C(AS)
level, the MDM shall automatically resume normal operation and process any subsequent write, read
or test instruction.
Manual tests conducted from the MDM front panel shall not
be inhibited by the DAMS OTB 2 control line whenever the I/O interface cable is disconnected from the
Drum Controller.
In the Logic 1 state, this line shall be required to sink no
more than 10 milliamperes to ground. In the open-circuit condition no more than +12 VDC shall be
applied to this line. The DAMS OTB 2 line shall not be subject to the MDM interface logic level re-
quirements as stated in this specification except to the extent as explicitly stated in this paragraph.
(2) MDM SI (MDM System Initialize) - The MDM shall have the
capability of monitoring the MDM S1 line in the following m a n n e r . Whenever an open-circuit condition
is present on the MDM S1 line, the MDM shall process any write, read or test instruction. Whenever
a Logic 1 level is detected the MDM shall go into an immediate standby condition which precludes any
further data processing activity or acceptance of control signals. Upon detection of an open-circuit
condition, the MDM shall automatically resume normal operation and process any subsequent write,
read or test instruction. In the Logic 1 state, this line shall be required to sink no more than 10
milliamperes to ground. In the open-circuit condition no more than +12 VDC shall be applied to this
line. The MDM S1 line shall not be subject to the MDM interface logic level requirements as stated in
this specification except to the extent as explicitly stated in this paragraph.
Controller Test Signals - Test signals between the Drum Con-
3.5.4.4.4.3.3.4.6.5
troller and MDM shall be as follows:
(1) MDC Test Mode Inhibit - The MDM, upon receipt of an
MDC Test Mode Inhibit signal (Logic 1 level) from the Drum Controller, shall ignore all signals at the
interface with the exception of the MDM S1 and the DAMS OTB 2 signals. Upon removal of the MDC
Test Mode Inhibit signal, the MDM shall automatically resume normal operation and process all
interface signals.
(2) MDM Manual Test Inhibit - The MDM shall have the
capability of monitoring the MDM Manual Test Inhibit line as follows:
(a) For a Logic 1, the MDM shall inhibit all manual test
operations from being performed from the MDM front panel. In addition the MDM shall not inhibit in
any way operational instructions (write/read/test modes) from being performed when issued from the
Drum Controller.
(b) For a Logic O, the MDM shall be capable of perform-
ing operational instructions (write/read/test modes) from the Drum Controller or manual tests from
the MDM front panel. The MDM when performing manual test operations from the MDM f rent panel
shall operate as specified by the status of the MDM Track Test Inhibit line.
(3) MDM Track Test Inhibit - The MDM shall have the capa-
bility of monitoring the MDM Track Test Inhibit Line and of performing as follows: Whenever a Logic
1 condition is present on the MDM Track Test Inhibit line, the MDM shall inhibit MDM Test Mode 1 and
manual test operations from the MDM f rent panel from being performed on the normal data sector (1 to
1090 word locations) of all data tracks. Whenever an open circuit condition is present, the MDM shall
be capable of performing MDM Test Mode 1 and manual test operations from the MDM front panel
utilizing the entire normal data sector (1 to 1090 word locations) and test sector (1091 to 1239 word
locations) of all data tracks. In addition, whenever the MDM Track Test Inhibit line is open circuit
and MDM Test Mode 1 is initiated, the MDM during the entire MDM Test Mode 1 sequence starting
with the first write operation using the first data pattern on the first track, shall send Parity Error
1/2 and Parity Error 3/4 pulses to the Drum Controller. Whenever the MDM Track Test Inhibit line
is a Logic 1, Parity Error 1/2 and Parity 3/4 pulses shall be inhibited for the entire duration of MDM
Test Mode 1.
268
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