Set_Link_Rate Command; Open_Channel Command; Open_Channel Command And Indication - NEC uPD98502 User Manual

4.7.1 Set_Link_Rate command

This command is used to set the link rate of ATM PHY interface. After initializing ATM Cell Processor, this
command has to be issued once, before any packet is transmitted.
[Set_Link_Rate command]
CMR
0 1 1 1
2
31 30 28 27 26
9
PHY No. PHY Number.
Link Rate Actual Link Rate is inserted in this field. The format of the rate is following.
e
2 (1 + m/512)*nz cells/sec
Re-
nz
served
15 14 13

4.7.2 Open_Channel command

This command is used to open a new channel to be used for a send or receive operation. When the channel is
opened, ATM Cell Processor reserves the area for the VC table in Work RAM and returns the VC Number as an
indication.
The indication that ATM Cell Processor returns for this command is of the following format:
[Open_Channel command]
CMR
0 1 0 0 0
31 30 29 28 27 26 25
[Open_Channel command Indication]
CMR
Undefined
31
VC Number VC Number of the opened channel. If no more new VCs can be opened, VC Number in the
indication is set to 0.
258
CHAPTER 4 ATM CELL PROCESSOR
Figure 4-18. Set_Link_Rate Command
0 PHY No.
20 19 16 15
e
9 8
Figure 4-19. Open_Channel Command and Indication
18 17
Preliminary User's Manual S15543EJ1V0UM
Link Rate
m
0
VC Number
6
0
0
0
0
5 0