Motorola PowerQUICC II MPC8280 Series Reference Manual page 1245

Table 34-10. IMA Group Receive Table Entry (continued)
Offset Name
0x18 REF_LINK
0x1C LINK_ICP
0x20 LINK_DCB
0x24 LINK_LD
0x28 CELL_COUNT
0x29 RVPHYNUM
MOTOROLA
Freescale Semiconductor, Inc.
Width
Word Bit array identifying which of the links (i.e., PHY) in this group are
enabled. Bit 0 corresponds to PHY 0, bit 30 corresponds to PHY 30.
Software must set the corresponding bits to 1 so that the delay
compensation process for the link(s) is started.
Word Bit array identifying which of the links in this group has received an ICP
cell. A "1" in the corresponding link's bit position indicates that an ICP
cell has been received. Microcode-managed parameter. Initialize to
zero at group startup.
Word Bit array identifying which of the links in this group has started storing
cells to its corresponding DCB. A "1" in the corresponding link's bit
position indicates that cells have been stored in the DCB.
Microcode-managed parameter. Initialize to zero at group startup.
Word Bit array identifying which of the "added" links in this group has a
Longer propagation Delay (LD) than any of the existing links. A "1" in
the corresponding link's bit position indicates that it has a longer
propagation delay. Microcode-managed parameter. Initialize to zero at
group startup.
Byte Number of cells received on the TRL while in the Group Delay Sync.
stage. Used only when IDCR-regulated cell processing is used (i.e.
IGRCTNL[IDCR]=1). Used for determining TRLR. When
CELL_COUNT = 128, TRLR is calculated and can be used for
programming IDCR timer values. Microcode-managed parameter.
Initialize to zero at group startup.
Byte Receive Virtual PHY number. Maps this IMA receive group to a virtual
PHY number for the purpose of address mapping of received cells.
Note that this parameter must be unique; it must not conflict with the
PHY number of any non-IMA PHYs or with the RVPHYNUM of any
other IMA group.
If there are any PHY numbers which will never be used in a system (i.e.
the actual PHY with the address does not exist), then RVPHYNUM
should be selected from one of these PHYs. If no such PHY numbers
are available (i.e. the multi-PHY interface consists of the full 31 PHYs),
then select RVPHYNUM from one of the PHY numbers of the PHYs
within this IMA group.
Chapter 34. Inverse Multiplexing for ATM (IMA)
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IMA Programming Model
1
Description
34-35