Motorola PowerQUICC II MPC8280 Series Reference Manual page 1093

31.10.5.9 AAL5, AAL1 CES User-Defined Cell—RxBD Extension
In user-defined cell mode, the AAL5 and AAL1 CES RxBDs are extended to 32 bytes; see
Figure 31-49.
For AAL0, a complete cell, including the UDC header, is
stored in the buffer; the AAL0 BD size is always 8 bytes.
Offset + 0x08
Used to store the user-defined cell's extra cell header. The extra cell header can be 1–12 bytes long.
Offset + 0x14
Figure 31-49. User-Defined Cell—RxBD Extension
31.10.5.10 AAL5 TxBDs
Figure 31-50 shows the AAL5 TxBD.
0 1
Offset + 0x00 R —
Offset + 0x02
Offset + 0x04
Offset + 0x06
MOTOROLA Chapter 31. ATM Controller and AAL0, AAL1, and AAL5
Freescale Semiconductor, Inc.
NOTE
Extra Cell Header.
Reserved (12 bytes)
2 3 4 5 6
W I L — CM
Data Length (DL)
Tx Data Buffer Pointer (TXDBPTR)
Figure 31-50. AAL5 TxBD
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ATM Memory Structure
7 8 9 10 11
— CLP CNG
12 13 14 15
—
31-79