Released
Datasheet
PM73487 QRT
PMC-Sierra, Inc.
PMC-980618
Issue 3
622 Mbps ATM Traffic Management Device
(Continued)
Field (Bits)
Description
RX_CH_EN_AAL5_EPD
(13)
Initialize to the proper setting.
1
Enables AAL5 Early Packet Discard (EPD) and Packet Tail Discard (PTD)
when either the channel, the SC, or the device is in the congested state. If
the maximum threshold is reached, then the tail of the packet is discarded. If
CLP causes a cell to be dropped, then the tail is discarded.
Disables AAL5 EPD and PTD.
0
RX_CH_EN_EFCI
(12)
Enable EFCI insertion.
0
1
Disables EFCI insertion.
Enable EFCI insertion.
Reserved
(11:8)
Initialize to 0 at initial setup. Software modifications to these locations after setup may
cause incorrect operation.
RX_CH_SEQ_TYPE
(7:6)
Initialize to the proper setting.
11
10
01
00
Reserved.
Reserved.
Supports sequencing of up to two cells allowing a 155 Mbps VC.
No sequencing; allows a 78 Mbps VC.
The routing table at the other end of the connection must support the same resequencing
mode for unicast connections. For multicast connections, this field may be set to either
00 or 01.
RX_CH_SF_MULTICAST
(5)
Insert in the multicast (MC) cell bit in nibble 0 (refer to Table on page 91). If 1, this
channel is treated as multicast by the switch fabric. This must be the same as
RX_CH_SERVICE_CLASS(5) (refer to “TX_CH_SERVICE_CLASS” on page 189).
RX_CH_SF_SPARE
(4)
Insert into the spare (SP) bit in nibble 0 (refer to Table on page 91).
RX_CH_SWITCH_GROUP
(3:0)
Switch group to be used in nibble 1 as the cell is sent to the switch fabric.
3h
2h
1h
0h
For RX_CH_SERVICE_CLASS from 00h to 07h or 20h to 27h
For RX_CH_SERVICE_CLASS from 08h to 0Fh or 28h to 2Fh.
For RX_CH_SERVICE_CLASS from 10h to 1Fh or 30h to 3Fh.
Reserved.
The above settings are highly recommended for unicast service classes (00 to 1F)
to insure that high priority cells from the Rx get high priority through the switch fabric
(QSE), and similarly for medium and low priority cells.
The above settings are REQUIRED for the multicast service classes (20 - 3F) to
insure that the multicast backpressure mechanism works properly between the switch
fabric and the QRT. The switch fabric gives high, medium or low BP, and the QRT
must refrain from sending cells on the corresponding service classes.
9.3.1.2 RX_CH_TAG
Offset: 1h (4h byte)
Type: Read/Write
Format: Refer to the following table.
Field (Bits)
Description
RX_CH_TAG_0_6(3:0)
(31:28)
Tag information inserted into SE_D_OUT(3:0) immediately after the
SWITCH_GROUP/QUEUE field (refer to Table starting on page 91). It is also inserted
after TAG_5(3:0). Initialize to the proper setting.
185
PMC [ PMC-SIERRA, INC ]
