Motorola PowerQUICC II MPC8280 Series Reference Manual page 1285

are both initialized to the fraction value of the previous equation times 65536. For
example, lets say ((TRLR/(num_links x 128)) x (2048/2049)) yielded 10.45, then
IDCRCNT and IDCRREQ would equal 10. IDCRCNTF and IDCRREQF would
then be set to (.45 x 65536) = 29491 (0x7333).
4. Once the IDCR Table has been programmed, IDCR driven stream reconstruction
for this group can start: IMAROOT[IDCREN] |= x. The corresponding bit must be
cleared if this group is being deactivated/removed from a multi-group
configuration.
34.5.4.13 End-to-End Channel Signalling Procedure
34.5.4.13.1 Transmit
The end-to-end channel signalling field can be used by software to signal to the far end.
Because the end-to-end channel is not covered by the SCCI field and there are no standard
requirements for the minimum number of frames between changes of the end-to-end
channel field, it is not necessary to follow the procedure for ICP cell signalling in order to
do this; instead, the end-to-end channel field of the ICP template currently in use can be
directly updated. However, if a minimum number of frames between changes is desired,
then the procedure for ICP cell signalling can be used, skipping the step in which the SCCI
is updated.
34.5.4.13.2 Receive
No special facility is included for reception of the end-to-end channel. The end-to-end
channel field is part of the received ICP cells, so its information can be read by software
from those cells. However, ICP cells are only received when the SCCI field changes, so
changes in the end-to-end channel will not be received until the SCCI field also changes
(when there is a change in the status and/or control of the far end).
MOTOROLA
Freescale Semiconductor, Inc.
Chapter 34. Inverse Multiplexing for ATM (IMA)
For More Information On This Product,
Go to: www.freescale.com
IMA Software Interface and Requirements
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