Tx Packet Descriptor; List Of Tx Packet Attribute - NEC uPD98502 User Manual

4.5.1.1 Packet descriptor
A packet descriptor contains two words shown as Figure 4-10. Its address is word aligned.

-Tx packet descriptor

31
31 30
1 ENC
31
Table 4-1 is a list of Tx packet attributes. Detail will be given in Operation chapter.
Field
ENC
CLPM
PTI
GFC
IM
C10
AAL
MB
CPCS-UU
CPI
CHAPTER 4 ATM CELL PROCESSOR
Figure 4-10. Tx Packet Descriptor
16 15
Attribute
29 28 27 26
CLPM PTI
Directory Address
Table 4-1. List of Tx Packet Attribute
It contains Encapsulation bits to specify Encapsulation modes.
It contains CLP bit to be set in Tx cell header.
It contains PTI bit to be set in Tx cell header.
It contains GFC bit to be set in Tx cell header.
It disables interruption and indication when Tx is completed.
It enables generation and insertion of CRC10 code.
It specifies type of AAL.
It indicates the number of mailbox.
It contains CPCS-UU bits to be set in Tx cell trailer.
It contains CPI bits to be set in Tx cell trailer.
Preliminary User's Manual S15543EJ1V0UM
8 7
CPCS-UU
24 23 20 19
GFC IM
Description
0
CPI
18 17 16
C10 AAL MB
0
249