PM73487 QRT
PMC-Sierra, Inc.
PMC-980618
Issue 3
622 Mbps ATMTraffic Management Device
Released
Datasheet
174
9.2
Table 34 summarizes the contents of the AL_RAM.
Address Lookup RAM (AL_RAM)
Table 34. Address Lookup RAM (AL_RAM) Summary
Byte Offset
Long Offset
Name
Read or
Write
Description
800000
h
200000
h
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: 808000
h
If AL_RAM_CONFIG =
1: 810000
h
If AL_RAM_CONFIG =
2: 820000
h
If AL_RAM_CONFIG =
3: 880000
h
If AL_RAM_CONFIG =
0: 202000
h
If AL_RAM_CONFIG =
1: 204000
h
If AL_RAM_CONFIG =
2: 208000
h
If AL_RAM_CONFIG =
3: 220000
h
VCI_TABLE
R/W
Lookup table to determine the
receive channel number
(RX_CHAN_NUM) for VCCs.
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
Header and cell pointer for
multicast input and output
FIFO entries.
If AL_RAM_CONFIG =
0: 838000
h
If AL_RAM_CONFIG =
1: 870000
h
If AL_RAM_CONFIG =
2: 8C0000
h
If AL_RAM_CONFIG =
3: 9C0000
h
If AL_RAM_CONFIG =
0: 20E000
h
If AL_RAM_CONFIG =
1: 21C000
h
If AL_RAM_CONFIG =
2: 230000
h
If AL_RAM_CONFIG =
3: 270000
h
RX_NEXT_CELL
(internal structure)
R/W
Index to the next cell in the
receive per-channel linked list.
If AL_RAM_CONFIG =
0: 830000
h
If AL_RAM_CONFIG =
1: 860000
h
If AL_RAM_CONFIG =
2: 8A0000
h
If AL_RAM_CONFIG =
3: 980000
h
If AL_RAM_CONFIG =
0: 20C000
h
If AL_RAM_CONFIG =
1: 218000
h
If AL_RAM_CONFIG =
2: 228000
h
If AL_RAM_CONFIG =
3: 260000
h
Transmit Cell
Buffer Control
Block (internal
structure)
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.
If AL_RAM_CONFIG =
0: 80C000
h
If AL_RAM_CONFIG =
1: 820000
h
If AL_RAM_CONFIG =
2: 840000
h
If AL_RAM_CONFIG =
3: 900000
h
If AL_RAM_CONFIG =
0: 203000
h
If AL_RAM_CONFIG =
1: 208000
h
If AL_RAM_CONFIG =
2: 210000
h
If AL_RAM_CONFIG =
3: 240000
h
Service Order Con-
trol Block (internal
structure)
R/W
Timeslot-based priority table
for receive and transmit SCs.