Released
Datasheet
PM73487 QRT
PMC-Sierra, Inc.
PMC-980618
Issue 3
622 Mbps ATM Traffic Management Device
7.2.17 RX_QUEUE_ENGINE_TEST
Address: 28h (A0h byte)
Type: Read/Write
Function: The bits in this register disable individual functions within the queue engine
for system debug purposes.
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•
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Each instance of the “B” process (the UTOPIA receive Buffering process) performs the VPI/VCI map-
ping of a new cell from the UTOPIA interface to a receive CCB channel number.
The “U” process (the UTOPIA enqueue process) uses the receive CCB channel number from the “B”
process and peforms the cell enqueue function, including any congestion control.
The “S” process (the receive switch fabric cell Sending process) fetches a cell for switch fabric
dequeue.
The “P” process (the receive switch fabric acknowledge Post-processing process) analyzes the ACK
response from the previous cell transmission.
Reset Value: 0
Format: Refer to the following table.
Field (Bits)
Description
RESERVED
(31:27)
Write with 0 to maintain future software compatibility.
RX_4_RR_PTRS
(26)
1
Use 4 separate sets of round robin pointers, one set for each S process.
Use this to achieve more predictable multicast performance when the bit
SEPARATE_OUT_MC is set. This also allows more effective timeslot
entries to be used when SEPARATE_OUT_MC is cleared. This setting
can only be used when AL_RAM_CONFIG is not equal to 0.
Use 1 set of round robin pointers.
0
RX_STATS
(25)
1
0
Enable the storage of RX_CH_STATS in the ABRAM
Disable the storage of RX_CH_STATS in the ABRAM. Use this setting
when only 64K x 16 of memory is present or if the RX_CH_STATS are
not needed.
RX_LONG_SVC_TBL
(24)
1
0
Use 511 entry long RX_SERVICE_TABLE. This allows finer control of
the bandwidth. This setting can only be used when AL_RAM_CONFIG
is not equal to 0.
Use 127 entry long RX_SERVICE_TABLE.
RESERVED
(23)
Write with 0 to maintain future software compatibility.
RX_SCG_ENABLE
(22)
1
Enforce the Service Class Group congestion limits configured in
RX_LWRxx_MAX_QD and RX_LWRxx_EXP_CONG_QD. Note:
When this feature is enabled, the maximum queue depth for any of the
three service class groups is 31K cells.
0
1
Ignore the configured SCG congestion limits
RX_RED_ENABLE
(21)
Enable Random Early packet Discard function. The
RX_xxx_EXP_CONG_QD that is used for each of the CH, SC, SCG,
and DIR settings is randomly chosen to be the user configured one or the
value one codepoint below the configured value.
RED disabled
0
123
PMC [ PMC-SIERRA, INC ]
