MPC8280 datasheet(1188/1386 Pages) FREESCALE

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Inverse Multiplexing for ATM (IMA)

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

34-42

Freescale Semiconductor

34.4.5.2.2

IMA Link Receive State (ILRSTATE)

The fields of the ILRSTATE register are shown in Figure 34-25

Table 34-21 describes the ILRSTATE bit fields.

3–4

RXSC

Receive status/control. Sets the receive mode of the IMA link.

00 Filler mode. The IMA link processes only ICP cells. Data cells are replaced with filler cells.

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

10 Dropped. Must be set by the user during the process of dropping the link. Dropped links are

treated filler mode until they are switched out of the receive round-robin (i.e. data cells are

replaced with filler cells).

11 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 receive group’s RIMAID field.

ADD_NEW

Identifies this link as a new/added link to a group. Software must flip (0 to 1 or 1 to 0) this bit

ONLY when adding a link to an existing group that is operational. If ADD_NEW =

ILRSTATE[ADD_NEW_M] = 0, set ADD_NEW to 1 to indicate this is an added link. If

ADD_NEW = ILRSTATE[ADD_NEW_M] = 1, set ADD_NEW to 0 to indicate this is an added

link. Initialize to zero.

MON_ICP

Setting this bit will allow changed ICP cells received on this link to be passed on to the ATM

layer (defined channel). The user must monitor at least one link in order for ICP cells to be

passed on to the ATM layer.

10–15

—

Reserved, initialize to zero.

456

Field ADD_NEW_M

IFSS

MASK_ERR

STFEX

CHK_NXT DATA_ERR

Field

icp_cell

FSES

SYNC_DeFeCT

STFIP

—

Figure 34-25. IMA Link Receive State (ILRSTATE)

Table 34-21. ILRSTATE Field Descriptions

Bits

Name

Description

ADD_NEW_M

"New Link" shadow bit. Microcode managed parameter. Initialize to zero at link startup.

1–2

IFSS1

IMA frame synchronization state. Microcode-managed parameter. Initialize to zero at

link startup.

00 IMA hunt.

01 IMA presync.

1x IMA sync.

MASK_ERR

Mask Error. Microcode managed parameter. Initialize to zero at link startup.

STFEX

Stuff cell expected. Microcode-managed parameter. Initialize to zero at link startup.

Table 34-20. ILRCNTL Field Descriptions (continued)

Bits

Name

Description

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