MPC8280 datasheet(1116/1386 Pages) FREESCALE

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ATM AAL2

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

33-10

Freescale Semiconductor

3–4

Byte ordering. This field is used for data buffers.

00 Reserved.

01 Power PC little endian.

1x Big endian.

—

Reserved, should be cleared during initialization.

DTB

Data buffer bus selection.

0 Data buffers reside on the 60x bus.

1 Data buffers reside on the local bus.

BIB

Bus selection for the BDs, interrupt queues and the free buffer pool.

Reside on the 60x bus.

Reside on the local bus.

AVCF

Auto VC off. Determines APC behavior when the last buffer associated

with this VC has been sent and no more buffers are in the VC’s TxBD

table,

The APC does not remove this VC from the schedule table and

continues to schedule it to transmit.

The APC removes this VC from the schedule table. To continue

transmission after the host adds buffers for transmission, a new ATM

TRANSMIT

command is needed, which can be issued only after the CP

clears the VCON bit. (Bit 13)

PFM

Partial fill mode. See Section 33.3.3, “Partial Fill Mode (PFM).”

Partially filled cells are not supported.

Partially filled cells are supported.

10–11

ATT

ATM traffic type

00 Peak cell-rate pacing (regular traffic). The host must initialize PCR

and PCR fraction. Other traffic parameters are not used.

01 Peak and sustain cell rate pacing (VBR traffic). The APC performs a

continuous-state leaky bucket algorithm (GCRA) to pace the

channel-sustain cell rate. The host must initialize PCR, PCR fraction,

SCR, SCR fraction, and BT (burst tolerance).

10 Peak and Minimum cell rate pacing. The host must initialize PCR, PCR

fraction, MCR, MCR fraction, and MDA.

11 Reserved.

Enable Timer_CU.

0 Timer_CU operation in this channel is disabled.

1 Timer_CU operation in this channel is enabled.

VCON

Virtual channel is on

Should be set by the host before it issues an ATM TRANSMIT command.

When the host sets the STPT (stop transmit) bit, the CP deactivates this

channel and clears VCON. The host can issue another ATM TRANSMIT

command only when the CP clears VCON.

14–15

INTQ

Points to one of the four interrupt queues available.

Table 33-1. AAL2 Protocol-Specific Transmit Connection Table (TCT) Field Descriptions (continued)

Offset

Bits

Name1

Description

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