AX88796LF ASIX Electronics, AX88796LF Datasheet - Page 31

• Manufacturer Part Number: AX88796LF
• Description: 3-in-1 Local CPU Bus Fast Rthernet Controller
• Manufacturer: ASIX Electronics

MEMORY DIAGNOSTICS
Memory diagnostics can be achieved by Remote Write/Read DMA operations. The following is a suggested step
for memory test and assume the AX88796 has been well initilized.
1. Issue the STOP command to the AX88796. This is accomplished be setting the STP bit in the AX88796's
2. Wait for at least 1.5 ms. Since the AX88796 will complete any reception that is in progress, it is necessary to
3. Write data pattern to MUT (memory under test) by Remote DMA write operation.
4. Read data pattern from MUT (memory under test) by Remote DMA read operation.
5. Compare the read data pattern with original write data pattern and check if it is equal.
6. Repeat step 3 to step 5 with various data pattern.
LOOPBACK DIAGNOSTICS
1. Issue the STOP command to the AX88796. This is accomplished be setting the STP bit in the AX88796's
2. Wait for at least 1.5 ms. Since the AX88796 will complete any reception that is in progress, it is necessary to
3. Place the AX88796 in mode 1 loopback. (MAC internal loopback) This can be accomplished by setting bits
4. Issue the START command to the AX88796. This can be accomplished by writing 22H to the Command
5. Write data that want to transmit to transmit buffer by Remote DMA write operation.
6. Issue the TXP command to the AX88796. This can be accomplished by writing 26H to the Command
7. Read data current receive buffer by Remote DMA read operation.
8. Compare the received data with original transmit data and check if it is equal.
9. Repeat step 5 to step 8 for more packets test.
Command Register. Writing 21H to the Command Register will stop the AX88796.
time out for the maximum possible duration of an Ethernet reception. This action prevents buffer memory
from written data through Local DMA Write.
Command Register. Writing 21H to the Command Register will stop the AX88796.
time out for the maximum possible duration of an Ethernet reception. This action prevents buffer memory
from written data through Local DMA Write.
D2 and D1, of the Transmit Configuration Register to ``0,1''.
Register. This is necessary to activate the AX88796's Remote DMA channel.
Register.
4.2.5 Other Useful Operations
AX88796 L
3-in-1 Local Bus Fast Ethernet Controller
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ASIX ELECTRONICS CORPORATION