Motorola MPC8260 User Manual

29-78

MOTOROLA

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. 

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.

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)

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