S E RV I C E
MOD E L 3562A
8-1 08
G LO BAL I NT E RFACE TEST
This tests moves (copies) a block of data from one area of global RAM to another area.
It exercises both interrupt circu its and the address circu itry besides testing the global inter
face circu its.
The CPU instructs the FFT to do a block move, waits for the FFT to signal that it has finished
the process, and then compares val ues of the two areas of RAM to determ ine whether
the data copied !s identical to the original data.
B. A9 Signature Analysis Tests
There are three digital signature tests designed to test the digital circu its on the FFT board.
These tests are referred to by number as tests 1 , 2, and 3.
Test 1 tests the program ROMs (U301 and U303) and, to a lim ited extent, the TMS320
microprocessor. See table A9-2 for the signatures of test 1 . With J3 and J4 in the test position
(marked with a "T") the ROM output l ines are d isconnected and the TMS320 data l i nes
are grou nded. This test may be used to test the i nput and output signals of the ROM
i ntegrated circu its. The operation of the m icroprocessor is partially verified by this test
because the add ress l ine outputs of the TMS320 are identical to the ROM input l ines.
Test 2 may be used to test most of the circu its on the FFT board. The only exceptions
are the global bus interface circu its. These require a special clock and are covered in test 3.
Test 3 may be used to test the global bus interface circu its (U51 1 through U51 6) and the
coefficient ROM outputs (U31 5 and U31 7). This test uses the memory grant signal on test
point 3 as a clock. See the table for test 3.
Perform the fol lowing steps to configure the instrument for any of the three digital signature
tests:
•
Disconnect the power cable.
•
Put the FFT board on an extender card. All jumpers should be in the normal (N)
position.
•
Select the signature test you wish to perform.
•
Connect and configure the signature analyzer as described in the tab le at the
beginn ing of the test you wish to perform.
•
Connect the power cable and tu rn on power.
1 . Digital Signatu re Test 1
Table A9-1
FFT Signature Analyzer Setup #1
Signal
Polarity
Connection
G round
A7 ) 5-1
Clock
Neg edge
A7 ) 5-3
Stop
Neg edge
A7 ) 5-4
Start
Pos edge
A7 ) 5-5
Содержание 3562A
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