MPC8280 datasheet(1189/1386 Pages) FREESCALE

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Inverse Multiplexing for ATM (IMA)

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

Freescale Semiconductor

34-43

1Enable these parameters to their default values during IMA initialization to avoid spurious IMA exceptions in the IMA interrupt

queues.

34.4.5.3

IMA Link Receive Statistics Table

The IMA link receive statistics table is optional. It is enabled globally for this FCC via IMACNTL[IRSE].

The base of this table is determined by IRLINKSTAT. Entries in the table are indexed by the link number

of the associated link. The format for the IMA link receive statistic table entries is shown in Table 34-22

34.4.6

Structures in External Memory

The IMA microcode requires supporting queue structures in external memory. These are used for the jitter

buffers (on transmission) and the delay compensation buffers (on reception). These structures reside in a

1 megabyte memory region defined by IMAEXTBASE, and may reside on either the 60x bus or the local

bus, as defined by IMACNTL[DSB].

Start Up. Microcode-managed parameter. Initialize to zero at link startup.

CHK_NXT

Check Next. Microcode-managed parameter. Initialize to zero at link startup.

DATA_ERR

Data Error - Parity/CRC. Microcode-managed parameter. Initialize to zero at link

startup.

ICP_CELL

Current Cell is an ICP Cell. Microcode-managed parameter. Initialize to zero at link

startup.

9–10

FSES1

Frame Synchronization Error State. Microcode-managed parameter. Initialize to 10 at

link startup.

00 IMA working.

01 Out-of-IMA frame anomaly.

1x Loss-of-IMA frame defect.

SYNC_DEFECT

Synchronization Defect. Microcode-managed parameter. Initialize to zero at link

startup.

STFIP

Stuff In-Progress flag. Microcode-managed parameter. Initialize to zero at link startup.

Dropped link. Microcode-managed parameter. Initialize to zero at link startup.

14–15

—

Reserved, initialize to zero.

Table 34-22. IMA Link Receive Statistics Table Entry

Offset

Name

Width

Description

0x00

ICPVIOL

Word

IMA receive ICP violation event counter. While ILRCNTL[SES]=0,

increments each time an errored, invalid, or missing ICP cell is received

on this link. Initialize to zero at link startup.

0x04

OIF

Word

Out-of-IMA frame counter. While ILRCNTL[SES]=0, increments each

time an Out-of-IMA Frame anomaly occurs on this link. Initialize to zero

at link startup.

Table 34-21. ILRSTATE Field Descriptions (continued)

Bits

Name

Description

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