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CHAPTER 4 ATM CELL PROCESSOR
Preliminary User’s Manual S15543EJ1V0UM
249
4.5.1.1 Packet descriptor
A packet descriptor contains two words shown as Figure 4-10. Its address is word aligned.
Figure 4-10. Tx Packet Descriptor
-Tx packet descriptor
31 016 15
Attribute CPCS-UU CPI
8 7
16
GFC
28
CLPM
27
PTI
26 24 23 19 18 1720
IM C10 AAL MB
Directory Address
31 0
31
1
30
ENC
29
Table 4-1 is a list of Tx packet attributes. Detail will be given in Operation chapter.
Table 4-1. List of Tx Packet Attribute
Field Description
ENC It contains Encapsulation bits to specify Encapsulation modes.
CLPM It contains CLP bit to be set in Tx cell header.
PTI It contains PTI bit to be set in Tx cell header.
GFC It contains GFC bit to be set in Tx cell header.
IM It disables interruption and indication when Tx is completed.
C10 It enables generation and insertion of CRC10 code.
AAL It specifies type of AAL.
MB It indicates the number of mailbox.
CPCS-UU It contains CPCS-UU bits to be set in Tx cell trailer.
CPI It contains CPI bits to be set in Tx cell trailer.