Allen-Bradley 1784-KTX Reference Manual page 24

Chapter 2
Start up and Shutdown
2-8
Check Mode
Before you run the diagnostic, verify that the card is being operated in
extended M16 mode.
1. Read the status registe
set to 1 or 0.
If bit 5 is then the KTx card is
configured for
1 8 bit mode
8/16 bit operation is
configured with the 3 pin
header on the KTx.
0 16 bit mode
2. Read the card control read registe
bits 0:7 is set to 1 or 0.
If bit 1 is then the ASIC is configured for
1 standard M16 operation and must be placed in extended M16 mode
The ASIC should not be in standard mode because standard M16 mode
is not implemented by current APIs as noted on page 2 7.
Go to step 3.
0 extended M16 operation
Go to the next section, Disable M16 Operation.
3. Place the ASIC in extended M16 mode by saving the contents of the
card control read register and writing to the card control write
registe r, address 80A, with bit 1 set to 0.
The ASIC is now configured for extended M16 operation.
Disable M16 Operation
Write the key bytes to the ASIC to disable M16 operation.
1. Verify that the key bytes are operational by writing:
to the key 0 write registe r, address 805, with a 0xBB
to the key 1 write registe r, address 807, with a 0xCC
2. Access the key read registe
The value returned should be 0xCCBB. Note that the key read
register is a 16-bit register and must be accessed with a 16-bit read.
8-bit accesses to these registers will return the value of the pulled-up
ISA bus, or 0xF F.
r, address 804, and check if bit 5 of bits 0:7 is
then
Inform the user that his KTx is configured
for 8 bit operation and he needs to
configure it for 16 bit operation to
execute the host compatibility test.
IMPORTANT: Skip the M16 test if you
leave the card in 8 bit mode.
Go to step 2.
r, address 80C, and check if bit 1 of
r, address 800, with a 16-bit read.