Motorola PowerQUICC II MPC8280 Series Reference Manual page 1235

34.4.2.3 IMA-Specific FCC Parameters
The following parameter must be programmed in the FCC parameter RAM page in addition
to the standard FCC parameters for ATM.
Offset Name
0xEE IMAROOT
IMAROOT must be programmed to a 128-byte aligned address
terminating with 0x80 (i.e. 0xnn80).
34.4.3 IMA Root Table
Offset Name
0x04 IMAFILLERHD
0x00– IMAFILLERPLD
0x2F
0x30 FILLTAG
0x31 TQ_SIZE
0x32 TQ_TARGET
0x33 TQ_THRESHOLD Byte
0x34 RESERVED
0x36 IMACNTL
MOTOROLA
Freescale Semiconductor, Inc.
Table 34-2. FCC Parameter RAM Additions
Width
Hword Offset of IMA root table in DPRAM. Must be 128-byte aligned.
NOTE
Table 34-3. IMA Root Table
Width
2
4 Bytes Filler cell template. Used by microcode in transmission of filler cells. The
cell is formatted as byte-swapped, and additionally the header is
48 Bytes
bitswapped. [This is due to hardware implementation, and does not imply
the order of the transmission of the cell. The transmission of the cell is per
the ATM standard.]
Content should be:
0xD0000000 (header)
0x6A6A0001 or 0x6A6A0003 (for IMA Version 1.0 or 1.1)
0x6A6A6A6A (padding)
0x6A6A6A6A (padding)
0x6A6A6A6A (padding)
0x6A6A6A6A (padding)
0x6A6A6A6A (padding)
0x6A6A6A6A (padding)
0x6A6A6A6A (padding)
0x6A6A6A6A (padding)
0x6A6A6A6A (padding)
0x6A6A6A6A (padding)
0xC6026A6A or 0xD9026A6A (for IMA Version 1.0 or 1.1)
Byte Tag indicating that the filler template is a filler cell. Program to zero.
Byte Transmit queue size. Recommended value is 0x18. Must be a multiple of
4. Refer to Section 34.4.6.1, "Transmit Queues for more details
Byte Transmit queue target level. Recommended value is 0x0C. Must be a
multiple of 4.
Transmit queue stuff threshold. Recommended value is 0x0C. Must be a
multiple of 4.
Hword Reserved.
Byte IMA control parameter. Controls functions shared by all IMA groups for this
FCC.
Chapter 34. Inverse Multiplexing for ATM (IMA)
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IMA Programming Model
Description
1
Description
34-25