Freescale Semiconductor MPC8260 - Manual (Page 1135)

Inverse Multiplexing for ATM (IMA)
MPC8260 PowerQUICC II Family Reference Manual, Rev. 2
Freescale Semiconductor 33-33
33.4.4.1.4 ICP Cell Templates
The ICP cell templates are areas of memory provided by software to the microcode for construction of ICP
cells for transmission. Software prepares the fields which are common to the group (i.e. class B, C, D, and
E parameters). The other (class A) parameters will be written to the appropriate fields by the microcode.
The template is 53 bytes long and must be aligned on a 64-byte boundary.
Table 33-9 describes the format of a group order table entry. The ICP cell template is formatted as
byte-swapped, and additionally the ICP cell header is bitswapped. [This is due to hardware
implementation, and does not imply the order of transmission of the cell. The transmission of the cell is
per the ATM standard.] Reflecting this byte-swap, the offset column gives the offset in DPRAM from the
ICP template base.
Table 33-8. Transmit Group Order Table Entry Field Descriptions
Bits Name Description
0–2 — Reserved
3–7 PHY
ADDRESS PHY address (Up to 31 PHYs[0–30]) of the link transmitting in this position in the round-robin.
A value of 0x1F in this field indicates the end of the group order table.
Table 33-9. ICP Cell Template
1
Offset Name Width Description
0x00 ICP CELL HEADER Word ICP cell header. Program to 0xD0000000.
0x04 ICP Cell Offset Byte Microcode-managed area. Microcode will program this field
dynamically.
0x05 IMA Frame Sequence
Number Byte Microcode-managed area. Microcode will program this field
dynamically.
0x06 Cell ID and Link ID Byte Microcode-managed area. Microcode will program this field
dynamically.
0x07 OAM LABEL Byte IMA Version value.
1
IMA Version 1.0
3 IMA Version 1.1