Tx_Ready Command - NEC uPD98502 User Manual

4.7.4 Tx_Ready command

The Tx_Ready command is used by the V
added for a specified channel (a new packet descriptor has been set in system memory queue). Upon receiving this
command, ATM Cell Processor makes the scheduling table active to perform scheduling. In this command, when it
detects some errors, writes E bit in A_CMR.
This command has the following format:
[Tx_Ready command]
CMR
0 1 1 0 0 1
31 30 29 28 27 26 25 24
CER
31
[Tx_Ready command indication]
CMR
0 1 1 0 0 1
31 30 29 28 27 26 25 24 23
Tx_Ready command
VC Number
Packet descriptor address
Tx_Ready command indication
E
VC Number
260
CHAPTER 4 ATM CELL PROCESSOR
4120A to notify ATM Cell Processor that a transmit packet has been
R
Figure 4-21. Tx_Ready Command and Indication
0
18 17
Packet Descriptor Address
E 0
18 17
The VC number of the channel which V
Address of the packet descriptor.
Error bit. If detects an error (ex. Invalid VC number), sets this bit to a '1'. When V
issues this command, this bit has to be a '0'.
The VC number of the channel which V
Preliminary User's Manual S15543EJ1V0UM
VC Number
6
VC Number
6
4120A intends to start transmission.
R
4120A intends to start transmission.
R
0
5 0
0
0
5 0
4120A
R