MPC8280 datasheet(1180/1386 Pages) FREESCALE

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Inverse Multiplexing for ATM (IMA)

MPC8280 PowerQUICC II Family Reference Manual, Rev. 1

34-34

Freescale Semiconductor

34.4.4.2.1

IMA Group Receive Control (IGRCNTL)

The fields of the IGRCNTL register are shown in Figure 34-17.

Table 34-11 describes the IGRCNTL bit fields.

34.4.4.2.2

IMA Group Receive State (IGRSTATE)

The fields of the IGRSTATE register are shown in Figure 34-18.

0x30

LINK_DCBO

Word

Link DCB overflow interrupt indication. Bit array identifying which links

have issued a link DCB overflow (DCBO) interrupt. This parameter

ensures that only one DCBO interrupt is generated per event.

Microcode managed parameter. Initialize to zero at group startup.

0x34–

0x3F

—

3 Words

Reserved. Must be initialized to zero at group startups.

1 Boldfaced entries indicate parameters that must be initialized by the user. All other parameters are

managed by the microcode and should be initialized to zero unless otherwise stated.

01234567

Field

GOTP

—

RXSC

IDCR

—

Figure 34-17. IMA Group Receive Control (IGRCNTL)

Table 34-11. IGRCNTL Field Descriptions

Bits

Name

Description

GOTP

Group order table pointer. Defines which group order table pointer (RGRPORDER0 or

RGRPORDER1) will be used for the cell extraction round-robin. Initialize to zero at group

startup.

1–2

—

Reserved, initialize to zero.

3–4

RXSC

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

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

cells.

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

1X Reserved. Defaults to Filler Mode.

IDCR

IDCR recovery enable. Selects the mode of the receive process activation function.

0 On-demand cell processing

1 IDCR-regulated cell processing

6–7

—

Reserved, initialize to zero.

0123

Field IDCR_DN

GDSS

—

Figure 34-18. IMA Group Receive State (IGRSTATE)

Table 34-10. IMA Group Receive Table Entry (continued)1

Offset

Name

Width

Description

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