IBM 3745 Series, Справочник по техническому обслуживанию оборудования

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EAC Card
Typical Ending Statuses
┌──────┬───────┬───────┬──────────────────────┐
│ SCF │ SES │ LCS │ Meaning
│
├──────┼───────┼───────┼──────────────────────┤
│ 44
│ ðð │ 9C │ Disable complete │
│ ðð │ ðð │ D2 │ Command rejected │
│ ðð │ ðð │ Seeñ │ Internal box error │
└──────┴───────┴───────┴──────────────────────┘
ñ = Refer to “Line Communication Status (LCS)” on page 12-30 for details.
Change
This command is used to update up to ten contiguous bytes of the Set Mode data.
The Change command is rejected if received on the odd interface or if it is sent to
a line that has not received a Set Mode command.
CSP Processing
1. Get the parameters from the CCU.
2. Update the Set Mode data bytes as requested.
3. Initialize the CSP control blocks and EAC with the new data.
4. Build the ending status and transfer it to the CCU.
5. Set a CCU level 2 interrupt request.
Typical Ending Statuses
┌──────┬───────┬────────┬──────────────────────┐
│ SCF │ SES │ LCS
│ Meaning │
├──────┼───────┼────────┼──────────────────────┤
│ 44 │ ðð
│ ðð │ Change complete │
│ ðð │ ðð │ D2 │ Command rejected │
│ ðð │ ðð │ Seeñ │ Internal box error │
└──────┴───────┴────────┴──────────────────────┘
ñ = Refer to “Line Communication Status (LCS)” on page 12-30 for details.
Transmit Data
The Transmit Data Command is used to transmit:
Ÿ Ethernet V2 frames
Ÿ IEEE 802.3 frames.
This command will be rejected if issued to the odd interface.
The entire frame must be contained in the first NCP buffer chain. When a buffer
pointer of zero is detected in the buffer prefix area, the end of data for the frame
has been reached.
CSP Processing
1. Get the parameters from the CCU.
2. Prepare a transmit control word for the EAC containing:
Ÿ The buffer count from the PSA
Ÿ The buffer offset from the PSA
Ÿ
The first transmit buffer address from the PSA.
Note: The buffer prefix length is forced to x'08' by the ESS.
Chapter 12. Ethernet Subsystem (ESS)
12-21