When Are The Contents Of Packet Descriptor Word0 Stored In Transmit Vc Table Word0; Is There A Limit To The Number Of Vcs Linked To A Shaper; Is There Any Problem If The Value Of The Vacant Field (Word1, Word2 Bits 31 To 16); Of The Transmit Packet Descriptor Is Not 0? Are The Values On The System Memory Rewritten - NEC mPD98409 Q&A

Q.7.6

When are the contents of packet descriptor Word0 stored in transmit VC table Word0?

A.7.6
After the Tx_Ready command has been issued, the µ PD98409 reads the packet descriptor and stores the
contents of packet descriptor Word0 in transmit VC table Word0, and then reads the data.
Reference: µ PD98409 User's Manual 5.4.3 (3) Status transition of transmit channel
Q.7.7

Is there a limit to the number of VCs linked to a shaper?

A.7.7
No. It is also possible to link all the VCs used to one shaper.
Reference: µ PD98409 User's Manual 5.4.3 Transmit channel (transmit VC)
Q.7.8
Is there any problem if the value of the vacant field (Word1, Word2 bits 31 to 16) of the transmit packet
descriptor is not 0? Are the values on the system memory rewritten?
A.7.8
The vacant field (Word1, Word2 bits 31 to 16) may be a value other than 0. After reading four words of packet
descriptors, the µ PD98409 internally ignores the information in the vacant field. The values on the system
memory are not rewritten.
V D/P S/M CLPM
Word0
31 30 29 28 27 26
Word1
31
Word2
31
Word3
31
Reference: µ PD98409 User's Manual 5.4.2 Structure of transmit data
CHAPTER 7 TRANSMISSION
PTI GFC IM C10 AAL
24 23 20 19 18
0
Information S14769EJ1V0IF00
MB CPCS-UU
17 16 15
0
16 15
ADDRESS
CPI
8 7
SIZE
0
0
0
0
25