 |
|||
|
|
|||
| ||||||||||
|
|  MIL-D-81347C(AS)
Following the E F word, the DAMS shall request a data word by
means of the ODR/OA sequence. This word shall provide stimulus data for the signals to be. tested and
shall determine the number of burst clocks to be generated.
Following the generation of the specified number of burst clocks,
the DAMS shall send a diagnostic word to the computer by means of IDR/IA control. The DAMS shall
then send another diagnostic word to the computer by means of EI/IA control. These two diagnostic
words shall provide 42 bits of test data to the computer.
(9) TM-9 Write/Read Address - The test mode shall verify the
correct operation to select a specific track and perform a write or read operation. The Drum shall
contain an area on each of the 384 addressable tracks for test purposes. The track test area shall be
available even with the specific track included in a memory protect sector.
The TM- 9 instruction code shall be entered via the EFR/EF
sequence with OB18-10 specifying the track address. The test area of the track shall be selected auto-
matically by the DAMS logic. Bit 21 of the EF word shall define a write or read operation by a state of
logic O or logic 1 respectively.
The actual operation after test mode entry shall be similar for
a normal 64-word write (ODR/OA sequence) or read (IDR/IA sequence) instruction.
The instruction status word shall be reported to the computer via
the EI/IA data transfer after the TM-9 instruction.
By repetitive use of TM-9 code with a different track address each
time, the computer shall be able to write on or read from all 384 tracks in approximately five seconds.
(10) TM-10 Word Clock Rate - This test mode shall verify
whether or not the correct number of word clocks is received from the Drum each revolution.
Following receipt of the TM-10 code via EFR/EF data transfer,
the DAMS shall cause the error counters to count word clocks during selected portions of the test area.
After the count has been accumulated, the DAMS shall send the error count status word to the computer
via EI/IA control sequence.
(11 ) TM-11 Drum Write/Read - TM-11 shall verify the ability
of the drum to write eight unique data patterns, read them back at three threshold levels and report
any error detected,
Upon entry of the TM-11 instruction code, the drum shall auto-
matically write the first of eight possible data patterns on all tracks in the test sector. The operation
shall then switch to the read mode, and the test data shall be read at normal, low and high threshold
levels. The sequence shall be repeated for each of the seven remaining data patterns.
.
Upon completion of the read operation on the last data pattern on
track 383 at high threshold, the EI shall then be generated and the instruction status word shall be sent
.
to the computer. The status word shall contain no useful information, but generation of the EI shall
indicate a completed test.
Any errors detected shall be loaded into buffers A and B through
the normal `data paths. The errors shall be stored in the buffers and reported via IDR/IA data transfer
as either buffer A and B is filled or upon completion of the test before the EI is generated.
A forced error switch shall allow the error generation logic to
be checked. Depression of the forced error switch shall cause an error word to be loaded into Buffer
A or B for each of the tracks, with each pattern, on high and low threshold in the read mode except for
the last pattern at high threshold on the last data track. Depression of the error switch must be done
prior to initiation of the TM-11 EFR/EF word.
(12) TM-12 Data Paths and Parity Check - This test mode shall
verify the data paths and byte parity logic of the drum by circulating data through the drum data paths.
287
|
|
Privacy Statement - Press Release - Copyright Information. - Contact Us |
Click
here for thousands of PDF manuals