PM7340 S/UNI-IMA-8
PRELIMINARY
INVERSE MULTIPLEXING OVER ATM
DATA SHEET
PMC-2001723
ISSUE 3
INVERSE MULTIPLEXING OVER ATM
groups. Each record is a 32 bit wide single word. Each record is addressed by
the group tag added as an offset of the base address
MEM_ADDR = 0x2A0 + Group Tag
Table 32 Transmit Group Configuration Table Record
Bits
Parameter
Description
31:23
22:16
Unused
VPHY
VPHY address (group FIFO number) which is
assigned to this group. Maintained by PM This field
should only be modified by the PM during group
configuration.
Address
15:9
10
Unused
Disable Cell
Discard
Configuration bit which determines if the ATM cell
discarding feature is enabled for this group. When set
to 0, ATM cells will be read and discarded from the
group FIFO (one for each request) if there are no
active links in the group. When set to 1, cell
discarding will not occur for the group.
9
Stuff
Configuration bit which determines whether stuff cell
advertising is done either 4 ICP cells ahead or 1 ICP
cell ahead of the stuff event. This bit is maintained by
the PM and read by the TIMA transmit state machine.
This bit should be changed only on group startup,
otherwise the number of cells between TRL stuff
events will be corrupted.
Advertise
Mode
0 = 1 ICP cell ahead; 1 = 4 ICP cells ahead
8
Stuff Mode
OAM Label
Configuration bit which determines whether ITC or
CTC stuff mode is actually used for this group. Note it
is possible to advertise ITC Transmit Clock Mode in an
ICP cell but still use a common clock and CTC stuff
mode. This bit is maintained by the PM and read by
the TIMA transmit state machine.
0 = ITC stuff mode, 1 = CTC stuff mode
Static field to be inserted into octet 6 of ICP cells and
7:0
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
247
PMC [ PMC-SIERRA, INC ]
