MPC8280 datasheet(1169/1386 Pages) FREESCALE

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Inverse Multiplexing for ATM (IMA)

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

34-23

NOTE

IMAROOT must be programmed to a 128-byte aligned address terminating

with 0x80 (i.e. 0xnn80).

34.4.3

IMA Root Table

Table 34-3. IMA Root Table1

Offset

Name

Width

Description

0x04

IMAFILLERHD2

4 Bytes

Filler cell template. Used by microcode in transmission of filler cells. The

cell is formatted as byte-swapped, and additionally the header is

bitswapped. [This is due to hardware implementation, and does not imply

the order of the transmission of the cell. The transmission of the cell is per

the ATM standard.]

Content should be:

0xD0000000 (header)

0x6A6A0001 or 0x6A6A0003 (for IMA Version 1.0 or 1.1)

0x6A6A6A6A (padding)

0xC6026A6A or 0xD9026A6A (for IMA Version 1.0 or 1.1)

0x00–

0x2F

IMAFILLERPLD

48 Bytes

0x30

FILLTAG

Byte

Tag indicating that the filler template is a filler cell. Program to zero.

0x31

TQ_SIZE

Byte

Transmit queue size. Recommended value is 0x18. Must be a multiple of 4.

Refer to Section 34.4.6.1, “Transmit Queues for more details

0x32

TQ_TARGET

Byte

Transmit queue target level. Recommended value is 0x0C. Must be a

multiple of 4.

0x33

TQ_THRESHOLD Byte

Transmit queue stuff threshold. Recommended value is 0x0C. Must be a

multiple of 4.

0x34

RESERVED

Hword

Reserved.

0x36

IMACNTL

Byte

IMA control parameter. Controls functions shared by all IMA groups for this

FCC.

0x37

TMP_PCNT

Byte

Microcode managed parameter (pass count).

0x38

RXPHYEN

Word

Receive PHY enable. Bit array addressed by PHY address (e.g. bit 0

corresponds to PHY 0). Setting a bit enables reception for the

corresponding PHY. Must be used to enable/disable the corresponding

PHY regardless of whether or not the PHY is defined as IMA in IMAPHY.

All cells received by disabled PHYs are discarded. Note that the FCC must

also be enabled in GFMR[ENR] for reception to occur.

Bit 31 is reserved, and must be programmed to zero.

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