Motorola PowerQUICC II MPC8280 Series Reference Manual page 1244

IMA Programming Model
34.4.4.2 IMA Group Receive Table Entry
Table 34-10. IMA Group Receive Table Entry
Offset Name
0x00 IGRCNTL
0x01 IGRSTATE
0x02 RIMAID
0x03 IMAVER
0x04 RM
0x05 RNUMLINKS
0x06 DCB_RM
0x07 RSCCI
0x08 DCBLNK
0x0A DCBX
0x0C STALL_COUNT
0x0D REF_IFSN
0x0E GFP
0x10 RGRPORDER0
0x12 RGRPORDER1
0x14 ALPHABETA
0x15 GAMMA
0x16 TRLR
34-34
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Width
Byte IMA group receive control parameters.
Byte IMA group receive state. Microcode-managed parameter. Initialize to
zero at group startup.
Byte Receive IMA ID. Program to the validated receive IMA ID value.
Byte IMA version. Program to the validated IMA version value.
1 IMA Version 1.0
3 IMA Version 1.1
Byte Receive IMA frame size. Program to 31, 63, 127, or 255 for frame sizes
of 32, 64, 128, or 256, respectively.
Byte Number of receive links in the IMA group that are in the active state
(ILRCNTL[RXSC]=01.
Byte Current cell (x out of RM cells in a Frame) being processed by the
reconstruction routine. Microcode-managed parameter. Initialize to
zero at group startup.
Byte Receive IMA SCCI field. Microcode-managed parameter. Holds the
SCCI value of the last ICP cell received by this group.
Hword Pointer to link entry in group order table currently in use.
Microcode-managed parameter. Initialize to value of RGRPORDER0
at group startup.
Hword Delay-compensation buffer extraction pointer. Microcode-managed
parameter. Initialize to zero at group startup.
Byte Number of IDCR or On-demand requests made for which there were
no cells available in a link's DCB. Microcode managed parameter.
Initialize to zero at group startup.
Byte Identifies the IFSN of the frame being processed by the
"reconstruction" routine. Microcode managed parameter.
Hword Pointer to the start of the current frame being processed by the
"reconstruction" routine. Microcode managed parameter. Initialize to
zero at group startup.
Hword Offset of receive group order table 0 in DPRAM.
Hword Offset of receive group order table 1 in DPRAM.
Byte Alpha and beta parameters for IMA frame synchronization mechanism
(IFSM).
Bits 0-3: Alpha. Allowable range is 1-2; typical value is 2.
Bits 4-7: Beta. Allowable range is 1-5; typical value is 2.
Byte Gamma parameter for IMA frame synchronization mechanism (IFSM).
Allowable range is 1-5; typical value is 1.
Hword TRL rate. Used only when IDCR-regulated cell processing is used (i.e.
IGRCTNL[IDCR]=1). Calculated by microcode during group startup,
prior to group activation. Referenced by software in order to program
the IDCRREQ and IDCRREQF of the group's IDCR table entry. Value
is valid after IGRSTATE[IDCR_DN] is set by the microcode.
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