MPC8280 datasheet(1018/1386 Pages) FREESCALE

1018 / 1386 page

ATM Controller and AAL0, AAL1, and AAL5

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

31-58

Freescale Semiconductor

Table 31-27 describes ABR-specific TCTE fields.

11121314

Offset + 0x00

ER-TA

Offset + 0x02

CCR-TA

Offset + 0x04

MCR-TA

Offset + 0x06 TUAR

—

CI-TA NI-TA

—

CP-TA

—

CI-VC

—

Offset + 0x08

MCR

Offset + 0x0A

UNACK

Offset + 0x0C

ACR

Offset + 0x0E ACRC

—

Offset + 0x10

RM Cell Time Stamp (RCTS)

Offset + 0x12

Offset + 0x14 FRST

—

CDF

COUNT

Offset + 0x16

ICR

Offset + 0x18

CRM

Offset + 0x1A

ADTF

Offset + 0x1C

Offset + 0x1E

ER-BRM

Figure 31-36. ABR Protocol-Specific TCTE

Table 31-27. ABR-Specific TCTE Field Descriptions

Offset

Bits

Name

Description

0x00

—

ER-TA

Explicit rate–turn-around cell. Holds the ER of the last received F-RM cell. If another F-RM

cell arrives before the previous F-RM cell was turned around, this field is overwritten by the

new RM cell’s ER.

0x02

—

CCR-TA

Current cell rate–turn-around cell. Holds the CCR of the last received F-RM cell. If another

F-RM cell arrives before the previous F-RM cell was turned around, this field is overwritten

by the new RM cell’s CCR.

0x04

—

MCR-TA Minimum cell rate–turn-around cell. Holds the MCR of the last received F-RM cell. If

another F-RM cell arrives before the previous F-RM cell is turned around, this field is

overwritten by the new RM cell’s MCR.

0x06

TUAR

Turn-around flag. The CP sets TUAR to indicate that a new F-RM cell was received, which

causes the transmitter to send a B-RM cell whenever the ABR flow control permits. Should

be cleared initially.

—

Reserved, should be cleared.

CI-TA

Congestion indication–turn-around cell. Holds the CI of the last received F-RM cell. If

another F-RM cell arrives before the previous F-RM cell was turned around, CI-TA is

overwritten by the new RM cell’s CI.

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