MPC8280 datasheet(1175/1386 Pages) FREESCALE

1175 / 1386 page

Inverse Multiplexing for ATM (IMA)

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

34-29

34.4.4.1.4

ICP Cell Templates

The ICP cell templates are areas of memory provided by software to the microcode for construction of ICP

cells for transmission. Software prepares the fields which are common to the group (i.e. class B, C, D, and

E parameters). The other (class A) parameters will be written to the appropriate fields by the microcode.

The template is 53 bytes long and must be aligned on a 64-byte boundary.

Table 34-9 describes the format of a group order table entry. The ICP cell template is formatted as

byte-swapped, and additionally the ICP cell header is bitswapped. [This is due to hardware

implementation, and does not imply the order of transmission of the cell. The transmission of the cell is

per the ATM standard.] Reflecting this byte-swap, the offset column gives the offset in DPRAM from the

ICP template base.

Table 34-9. ICP Cell Template 1

Offset

Name

Width

Description

0x00

ICP CELL HEADER

Word

ICP cell header. Program to 0xD0000000.

0x04

ICP Cell Offset

Byte

Microcode-managed area. Microcode will program this field

dynamically.

0x05

IMA Frame Sequence

Number

Byte

Microcode-managed area. Microcode will program this field

dynamically.

0x06

Cell ID and Link ID

Byte

Microcode-managed area. Microcode will program this field

dynamically.

0x07

OAM LABEL

Byte

IMA Version value.

IMA Version 1.0

IMA Version 1.1

0x08

GROUP STATUS AND

CONTROL

Byte

Bits 7-4: Group State

0000 = Start-up,

0001 = Start-up-Ack,

0010 = Config-Aborted - Unsupported M,

0011 = Config-Aborted - Incompatible Group Symmetry,

0100 = Config-Aborted - Unsupported IMA Version,

0101, 0110 = Reserved for other Config-Aborted reasons in a future

version of the IMA specification,

0111 = Config-Aborted - Other reasons,

1000 = Insufficient-Links,

1001 = Blocked,

1010 = Operational,

Others: Reserved for later use in a future version of the IMA

specification.

Bits 3-2: Group Symmetry Mode

00 = Symmetrical configuration and operation,

01 = Symmetrical configuration and asymmetrical operation (optional),

10 = Asymmetrical configuration and asymmetrical operation

(optional),

11 = Reserved

Bits 1-0: IMA Frame Length (00: M=32, 01: M=64, 10: M=128, 11:

M=256)

0x09

IMA ID

Byte

Bits 7-0: IMA ID

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