IBM 3745 Series, Hardware Maintenance Reference

Page: 645 / 712

EAC Card
Typical Ending Statuses
┌──────┬───────┬───────┬────────────────────────────────────────┐
│ SCF │ SES │ LCS │ Meaning
│
├──────┼───────┼───────┼────────────────────────────────────────┤
│ 4C
│ ðð │ ðð │ End of frame, data stored │
│ 4D │ ðð │ ðð │ End of frame and counters overflowed │
│ ðð │ ðð │ 8ð │ Timeout, no packets received │
│ ð1 │ ðð │ 8ð │ Timeout and counters overflowed │
│ ðð │ ðð │ D2 │ Command rejected │
│ ðð │ ðð │ Seeñ │ Internal box error │
│ C4 │ ðð │ ðð │ Halt executed │
└──────┴───────┴───────┴────────────────────────────────────────┘
ñ
= Refer to “Line Communication Status (LCS)” on page 12-30 for details.
Get Counters
The Get Counters command is used to pass the address of an NCP buffer to be
used by the ESS to return error counter information. This command is issued by
NCP in response to a counters overflowed status on a receive command (SCF bit 7
on) from the ESS. It may also be issued at other times when deemed necessary
by NCP to retrieve the current set of counters.
CSP Processing
1. Get the parameters from the CCU.
2. Place the counters in the buffer provided.
3. Build an ending status and transfer it to the CCU. This status will include the
'Counter that Overflowed' status byte.
4. Set a CCU level 2 interrupt request.
Typical Ending Statuses
┌──────┬───────┬───────┬──────────────────────┐
│ SCF │ SES │ LCS │ Meaning
│
├──────┼───────┼───────┼──────────────────────┤
│ 4C
│ ðð │ ðð │ Counter Data Stored │
│ ðð │ ðð │ D2 │ Command rejected │
│ ðð │ ðð │ Seeñ │ Internal box error │
│ C4 │ ðð │ ðð │ Halt executed │
└──────┴───────┴───────┴──────────────────────┘
ñ = Refer to “Line Communication Status (LCS)” on page 12-30 for details.
Halt
The halt command is used to terminate an outstanding command before it com-
pletes. The halt, service request and EOM bits are set in the SCF. Other status
bits are not changed. Thus, the status will show any condition that existed at the
time the halt was processed. Refer to the SCF bit description on page 12-29 for
more details.
The following commands may not be Halted:
Ÿ Start Trace
Ÿ Stop Trace
Ÿ Dump control blocks (no status)
Ÿ Dump control blocks (status)
Any attempt to halt these commands will result in unexpected responses from the
ESS.
Chapter 12. Ethernet Subsystem (ESS)
12-23