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7.2 Down Information
When an Ethernet Port goes to down mode, the factor that caused that transition is stored in the
T2N interface buffer as one word of data. This data can be read by the T2N with the READ
instruction.
Table 7.1 lists the down information error codes and the factors that caused the transition to down
mode.
Table 7.1 Down Information
Error code (H) Interpretation
0010 Watchdog timeout
0020 Memory bus stall
0030 A TRAP occurred
0040 Jabbering timeout
0050 LAN controller check error
0160 ROM BCC check data match error
0260 System RAM area check error
0360 T2N interface buffer check error
0500, 0501 Semaphore acquisition error
0502, 0503 Semaphore acquisition error
0504 MBX receive error
0505 MBX send error
0506 TCP resend queue full
0507 Acquired buffer in use
0508 Error in acquiring initial buffer
Important items
This is a read-only area. Do not write to this area with the WRITE instruction. Subsequent reads
will not return correct down information.
Sample: Down information readout
|R0000 |
1|-| |--[04081 MOV RW010][00001 MOV RW011][H00FE READ RW010 -> D1000]--|
| |
READ instruction description
H00FE: Module designation ... Ethernet Port must specify H00FE.
RW010: Specifies the 04081 (0FF1H) down information area.
0FF1H is the down information area for the Ethernet Port.
RW011: Specifies the number of words (00001) to be read out.
D1000: Specifies the register in which to store the read out down information.
In this case, the down information that is read out is stored in D1000.
The down information is stored in D1000 by turning R0000 on.