Lexicon
5-15
The NO< button is active to exit the Test Menu into the Top Level Menu.
WCS Test
This test will verify the Writeable Control Store of the Lexichip 2 (U85) is working. The WCS is first filled
with the value 55 hex (0101 0101 binary), then each memory location is read to see if it contains 55. If 55 is
in the memory location, the location is filled with AA hex (1010 1010 binary), and the next location is
processed. Once the WCS has been checked for 55's and filled with AA's, the process is repeated checking
for AA's and storing 0's into memory. Following this test is an Address test, which will verify that all the
address lines are active and connected to the Lexichip 2. Finally the memory is checked for 0's.
At the Functions Tests menu turn the Encoder until the display reads the following:
Diags: Tests
< WCS
Next press the STORE button and release. After the STORE button is pressed, the test is executed and
display will read the following if the test passed:
WCS Test:
Passed (done)
If the test failed, the display reads:
WCS Test:
Failed (done)
Press the NO< button to exit the Test Menu into the Top Level Menu.
Lo SRAM Test
This test will verify the memory spaces of the ADSP2186 (U88) and SRAM (U89). The memory space is
first filled with the value 55 hex (1010 1010 binary), then each memory location is read back to see if is
contains the 55hex. If 55 hex is read back, the memory is then filled with AA hex (1010 1010 binary) and
the test is repeated. The test is repeated a 3
rd
time, filling memory with 0s. When the test is completed, an
address test verifies that all address lines are active and the memory is filled with 0’s. The address range
for this test is 2000-27FF.
At the Functions Tests menu turn the Encoder until the display reads the following:
Diags: Tests
< SRAM
Next press the STORE button and release. After the STORE button is pressed, the test is executed and
display will read the following if the test passed:
SRAM Test:
Passed (done)
If the test failed, the display reads:
SRAM Test:
Failed (done)
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