Motorola MPC8260 - Manual (Page 858)

29-78 MPC8260 PowerQUICC II UserÕs Manual MOTOROLA
Part IV. Communications Processor Module
29.10.5.11 AAL5, AAL1 User-DeÞned CellÑTxBD Extension
In user-deÞned cell mode, the AAL5 and AAL1 TxBDs are extended to 32 bytes; see
Figure 29-53. Note that for AAL0 a complete cell, including the UDC header, is stored in
the buffer; the AAL0 BD size is always 8 bytes.
29.10.6 AAL1 Sequence Number (SN) Protection Table (AAL1 Only)
The 32-byte sequence number protection table, pointed to by AAL1_SNPT_BASE in the
ATM parameter RAM, resides in dual-port RAM and is used for AAL1 only. The table
should be initialized according to Figure 29-54.
29.10.7 UNI Statistics Table
The UNI statistics table, shown in Table 29-41, resides in the dual-port RAM and holds
UNI statistics parameters. UNI_STATT_BASE points to the base address of this table.
Each PHY has its own table with a starting address given by UNI_STATT_BASE+ PHY#
´ 8.
Offset + 0x08 Extra Cell Header.
Used to store the user-deÞned cellÕs extra cell header. The extra cell header can be 1Ð12 bytes long.
Offset + 0x14 Reserved (12 bytes)
Figure 29-53. User-Defined CellÑTxBD Extension
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Offset + 0x00 0x0000
Offset + 0x02 0x0007
Offset + 0x04 0x000D
Offset + 0x06 0x000A
Offset + 0x08 0x000E
Offset + 0x0A 0x0009
Offset + 0x0C 0x0003
Offset + 0x0E 0x0004
Offset + 0x10 0x000B
Offset + 0x12 0x000C
Offset + 0x14 0x0006
Offset + 0x16 0x0001
Offset + 0x18 0x0005
Offset + 0x1A 0x0002
Offset + 0x1C 0x0008
Offset + 0x1E 0x000F
Figure 29-54. AAL1 Sequence Number (SN) Protection Table