NEC Network Controller uPD98502 - Manual (Page 259)

CHAPTER 4 ATM CELL PROCESSOR
Preliminary User’s Manual S15543EJ1V0UM 259
4.7.3 Close_Channel command
The Close_Channel command is used to close a send or receive channel. Upon accepting this command, ATM
Cell Processor returns the VC table to VC Table pool.
The indication that ATM Cell Processor returns for this command has the following format:
Figure 4-20. Close_Channel Command and Indication
[Close_Channel command]
CMR
0 1 0 0 1 R/T 0 VC Number 0
31 30 29 28 27 26 25 24 18 17 6 5 0
[Close_Channel command indication]
CMR
Undefined E Undefined VC Number 0
31 25 24 23 18 17 6 5 0
Close_Channel command
R/T Indicates whether the channel to be closed is a send or a receive channel.
1: Receive channel
0: Transmit channel
VC Number VC Number of the channel that V R 4120A intends to close.
Close_Channel command indication
E Error bit. If detects an error (ex. Invalid VC number), sets this bit to a ‘1’. When V
R
4120A issues
this command, this bit has to be set to a ‘0’.
VC Number Closed VC Number of the channel. If the channel cannot be closed, 0 is set in this area.