MPC8280 datasheet(1098/1386 Pages) FREESCALE

1098 / 1386 page

ATM AAL1 Circuit Emulation Service

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

32-38

Freescale Semiconductor

Figure 32-27. Receive Buffers and BD Table Example

32.12 ATM Controller Buffers

Table 32-10 describes properties of the ATM receive and transmit buffers.

Table 32-10. Receive and Transmit Buffers

AAL

Receive

Transmit

Size

Alignment

Size

Alignment

AAL5

Multiple of 48 octets (except last buffer in frame) Double word aligned Any

No requirement

AAL3/4 At least 44 octets (except last buffer in frame)

Double word aligned At least 44 octets

No requirement

AAL1/

AAL1

CES

Multiple of 8 octets

No requirement

Multiple of 8 octets No requirement

AAL0

52-64 octets.

Burst-aligned

52–64 octets.

No requirement

BD memory space

RBD_Base

Rx BD table

of ch 1

Rx BD table

of ch 4

RBD_Offset

RBD_Base

RBD_Offset

Pointers

RxBD 1

RxBD 2

RxBD 3

RxBD 4

RxBD 5

RxBD 6

RxBD 7

RxBD 8

RxBD 9

RxBD 1

RxBD 2

RxBD 3

RxBD 4

RxBD 5

RxBD 6

Rx buffer 3 of

channel 1

Rx buffer 4 of

channel 1

Rx buffer 1 of

channel 4

Rx buffer 2 of

channel 4

Rx buffer 3 of

channel 4

Rx buffer 2 of

channel 1

Rx buffer 8 of

channel 4

•

Rx buffer 1 of

channel 1

Data memory space

from ch 1

entry of

RCT

Pointers

from ch 4

entry of

RCT

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