Released
Datasheet
PM73487 QRT
PMC-Sierra, Inc.
PMC-980618
Issue 3
622 Mbps ATM Traffic Management Device
9.2 Address Lookup RAM (AL_RAM)
Table 34 summarizes the contents of the AL_RAM.
Table 34. Address Lookup RAM (AL_RAM) Summary
Read or
Write
Byte Offset
Long Offset
Name
Description
800000h
200000h
VI_VPI_TABLE
R/W
The first lookup is to this table.
For VPCs, this lookup deter-
mines the channel number
directly. For VCCs, this deter-
mines the number of VCI bits
to use and the start of a block in
the channel number table.
If AL_RAM_CONFIG =
0: 808000h
If AL_RAM_CONFIG = VCI_TABLE
0: 202000h
R/W
Lookup table to determine the
receive channel number
If AL_RAM_CONFIG =
1: 810000h
If AL_RAM_CONFIG =
1: 204000h
(RX_CHAN_NUM) for VCCs.
If AL_RAM_CONFIG =
2: 820000h
If AL_RAM_CONFIG =
2: 208000h
If AL_RAM_CONFIG =
3: 880000h
If AL_RAM_CONFIG =
3: 220000h
Refer to “Multicast Cell
Instance Control Block
(Internal Structure)” on
page 177.
Refer to “Multicast Cell
Instance Control Block
(Internal Structure)” on
page 177.
Multicast Cell
Instance Control
Block (internal
structure)
R/W
R/W
Header and cell pointer for
multicast input and output
FIFO entries.
If AL_RAM_CONFIG =
0: 838000h
If AL_RAM_CONFIG =
1: 870000h
If AL_RAM_CONFIG = RX_NEXT_CELL
Index to the next cell in the
receive per-channel linked list.
0: 20E000h
If AL_RAM_CONFIG =
1: 21C000h
(internal structure)
If AL_RAM_CONFIG =
2: 8C0000h
If AL_RAM_CONFIG =
2: 230000h
If AL_RAM_CONFIG =
3: 9C0000h
If AL_RAM_CONFIG =
3: 270000h
If AL_RAM_CONFIG =
0: 830000h
If AL_RAM_CONFIG =
1: 860000h
If AL_RAM_CONFIG =
2: 8A0000h
If AL_RAM_CONFIG = Transmit Cell
0: 20C000h Buffer Control
If AL_RAM_CONFIG = Block (internal
R/W
For unicast cells, this is the
index to the next cell in the
transmit per-SCQ linked list.
For multicast cells, this is the
background processor control
block.
1: 218000h
If AL_RAM_CONFIG =
2: 228000h
structure)
If AL_RAM_CONFIG =
3: 980000h
If AL_RAM_CONFIG =
3: 260000h
If AL_RAM_CONFIG =
0: 80C000h
If AL_RAM_CONFIG = Service Order Con-
0: 203000h trol Block (internal
R/W
Timeslot-based priority table
for receive and transmit SCs.
If AL_RAM_CONFIG =
1: 820000h
If AL_RAM_CONFIG = structure)
1: 208000h
If AL_RAM_CONFIG =
2: 840000h
If AL_RAM_CONFIG =
2: 210000h
If AL_RAM_CONFIG =
3: 900000h
If AL_RAM_CONFIG =
3: 240000h
174
PMC [ PMC-SIERRA, INC ]
