Motorola PowerQUICC II MPC8280 Series Reference Manual page 1247

Table 34-11 describes the IGRCNTL bit fields.
Bits Name
0 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.
00Filler mode. The IMA group processes only ICP cells. Data cells are replaced with filler
cells.
01Active mode. The IMA group is capable of receiving data cells.
1XReserved. Defaults to Filler Mode.
5 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.
34.4.4.2.2 IMA Group Receive State (IGRSTATE)
The fields of the IGRSTATE register are shown in Figure 34-18.
0
Field IDCR_DN
Figure 34-18. IMA Group Receive State (IGRSTATE)
Table 34-12 describes the IGRSTATE bit fields.
Bits Name
0 IDCR_DN IDCR Done. Microcode-managed parameter. When this bit is set by the microcode, the TRLR
value is valid and can be used to program the IDCR timer entry values for this group. Initialize
to zero at group startup.
1-2 GDSS Group delay synchronization state. Initialize to zero at group startup. Must be changed by
software to 01 after sufficient links have achieved frame synchronization. Subsequently
managed by microcode.
00Group delay synchronization process inhibited.
01Group delay synchronization process enabled.
10Group delay synchronization process in progress.
11Group delay synchronized.
Refer to Section 34.5.4.10, "Receive Event Response Procedures".
3-7 — Reserved, initialize to zero.
34.4.4.2.3 IMA Receive Group Frame Size
The fields of the IRGFS register are shown in Figure 34-19.
MOTOROLA
Freescale Semiconductor, Inc.
Table 34-11. IGRCNTL Field Descriptions
1 2
GDSS
Table 34-12. IGRSTATE Field Descriptions
Chapter 34. Inverse Multiplexing for ATM (IMA)
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IMA Programming Model
Description
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Description
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