Motorola PowerQUICC II MPC8280 Series Reference Manual page 1266

IMA Software Interface and Requirements
the parameter LINE_RATE_ABR must also be scaled to reflect the change in bandwidth of
the group. For example, if TNUMLINKS increases from three to four, then
LINE_RATE_ABR must also be multiplied by 4/3.
34.4.10 Changing IMA Version
A new CPCR command has been added to the IMA microcode to change the IMA version
on-the-fly without software intervention. Use the following procedure:
1. Before issuing the command, the user should initialize the COMM_INFO fields in
the parameter RAM as described in Figure 34-31.
2. To issue this FCC command, refer to Section 14.4, "Command Set." Use opcode
1110(0xD).
m
0
0x86
0x88
0x8A
m
Table 34-29. COMM_INFO Field Descriptions
Offset Bits Name
0x86 0–8 —
9–11 ITG
12–15 —
0x88 0–15 Filler CRC Filler cell CRC. Set to 0xC602 (for IMA version 1.0) or 0xD902 (for IMA version 1.1)
0x8A 0–13 —
14–15 IV
3. Wait for the CPCR[FLG] to be cleared by the CPM before issuing a new CP
command. Refer to Section 14.4, "Command Set."
34.5 IMA Software Interface and Requirements
34.5.1 Software Model
The IMA microcode facilitates the implementation of the lower levels of an IMA system.
Host software (from here on, "host software" is code running on the G2_LE core) is
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Freescale Semiconductor, Inc.
—
Figure 34-31. COMM_INFO Field
Reserved, should be cleared.
IMA transmit group. Program to the IMA group number [0–7] multiplied by 16 bytes. For
example, if the IMA group number = 3, program ITG to 0x30.
Reserved, should be cleared.
Reserved, should be cleared.
IMA version
00 Reserved
01 IMA version 1.0
10 Reserved
11 IMA version 1.1
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8 9
ITG
Filler CRC
—
Description
11 12 15
—
IV
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