MPC8280 datasheet(1184/1386 Pages) FREESCALE

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Inverse Multiplexing for ATM (IMA)

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

34-38

Freescale Semiconductor

Table 34-16 describes the ILTCNTL bit fields.

34.4.5.1.2

IMA Link Transmit State (ILTSTATE)

The fields of the ILTSTATE register are shown in Figure 34-22

Table 34-17 describes the ILTSTATE bit fields.

012345

field

TRL

SES

—

TXSC

IGNUM

Figure 34-21. IMA Link Transmit Control (ILTCNTL)

Table 34-16. ILTCNTL Field Descriptions

Bits

Name

Description

TRL

Defines this link as the timing reference link (TRL) of the group.

0 This link is not the TRL.

1 This link is the TRL.

Note: One and only one link of the group must be programmed as the TRL. If zero or more than

one links are defined as TRL, erratic operation will occur.

SES

Severely errored seconds. Set by software when a severely errored second indication is

detected. When set, causes the transmit stuff event counter to stop counting.

—

Reserved, initialize to zero.

3–4

TXSC

Transmit status/control. Sets the transmit mode of the IMA link.

00 Filler mode. The IMA link transmits only ICP and filler cells, no data cells.

01 Active mode. The IMA link is capable of sending data cells.

1X Reserved.

5–7

IGNUM

Determines to which IMA group this link belongs. Contains the number of the link’s associated

IMA Group Table entry.

Note: This value need not be the same as the group’s IMA ID; the IMA ID is programmed

separately in the group’s ICP cell template.

012345

Field

LSTF

LIMSTf

LSTFIP

LGSU

TQSU

LDC

—

Figure 34-22. IMA Link Transmit State (ILTSTATE)

Table 34-17. ILTSTATE Field Descriptions

Bits

Name

Description

LSTF

Link stuff flag. Microcode-managed parameter. Indicates that the next ICP cell on this link will

be part of a stuff event. Initialize to zero at link startup.

LIMSTF

Link imminent stuff flag. Microcode-managed parameter. Indicates that an upcoming stuff

event will be signalled in the next ICP of this link (via LSI=001). Initialize to zero at link startup.

LSTFIP

Link stuff-in-progress flag. Microcode-managed parameter. Indicates that the next cell on this

link will be the second cell of a stuff event. Initialize to zero at link startup.

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