Lexicon 960L Service Manual page 44

960L Multi-Channel Digital Effects System Service Manual
TMIX Host Test:
The syntax for the TMIX Host Port Test is: TMixHostPortTest CardId TMixID [NumRepeats].
This tests the 56301's ability to access a TMix's host port. This test confirms that the 56301 fully access the
host port on specified TMix chip. This command writes a walking 1's pattern (0000 00001, 0000 0010, etc..)
to the "Test Control Register" (address 0x7B) on the specified TMix chip. Each value is written to the
register then read back and confirmed before moving on to the next value. While the data path is fully
tested, the test makes no attempt to confirm that it is writing to/reading from the correct register in the TMix.
Writing to the host port (and therefor a Host Register) involves writing the address of the selected Host
Register to the TMix's "Pointer Port". The actual data is then written to the "Data Port" which the TMix writes
to the appropriate Host Register using the address in the Pointer Port. Confirming that the Pointer Port is
working properly would require setting specific Host Registers then checking to make sure that the TMix
operating mode changed appropriately.
The Host Ports on the three TMIX's in the system are at the following addresses in 56301 memory space:
TMix 1:
Pointer Port - 0x9D2000
Data Port - 0x9D2001
TMix 2:
Pointer Port - 0x9D3000
Data Port - 0x9D3001
TMix 3:
Pointer Port - 0x9D4000
Data Port - 0x9D4001
Parameters:
CardID:
This number selects which reverb card to test. Legal values are 0 and 1, since only two reverb cards will be
supported. If only one card is present use the number 0.
TMixId:
This specifies which TMix on the card to test. Legal Values are 0, 1, and 2.
NumRepeats:
This optional parameter specifies how many times to run the test. A value of 0 runs the test indefinitely (until
a key is pressed). Dots are shown on the display to indicate that the test is still running.
TMIX DSP RAM Test:
The syntax for the TMIX DSP RAM Test is: TMixDspRamTest CardId TMixID [NumRepeats].
This tests the 56301's ability to access the DPRAM in a TMIX chip The test begins by filling the memory
space under test with a specific data value then reading back the contents of each memory location,
confirming the data contained therein is correct. Values of 0, 0xFFFFFF, 0xAAAAAA and 0x555555 are
tested. An address test is also run that writes each address value into its associated memory location
(address 29 has the value 29 written into it, address 30 has the value 30 written into it, etc...).
This test confirms that the 56301 can access all of the Dual Port RAM.
Parameters:
CardID:
This number selects which reverb card to test. Legal values are 0 and 1, since only two reverb cards will be
supported. If only one card is present use the number 0.
TMixId:
This specifies which TMIX on the card to test. Legal Values are 0, 1, and 2.
NumRepeats:
This optional parameter specifies how many times to run the test. A value of 0 runs the test indefinitely (until
a key is pressed). Dots are shown on the display to indicate that the test is still running.
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