
PM73487 QRT
PMC-Sierra, Inc.
PMC-980618
Issue 3
622 Mbps ATMTraffic Management Device
Released
Datasheet
176
9.2.2
VCI_TABLE
The VCI_TABLE determines the channel number for VCCs.
Base address (refer to
“AL_RAM_CONFIG” on page 105
):
If AL_RAM_CONFIG = 0, then the base address is 202000
h
(808000
h
byte).
If AL_RAM_CONFIG = 1, then the base address is 204000
h
(810000
h
byte).
If AL_RAM_CONFIG = 2, then the base address is 208000
h
(820000
h
byte).
If AL_RAM_CONFIG = 3, then the base address is 220000
h
(880000
h
byte).
Index: 1
h
Number of entries:
If AL_RAM_CONFIG = 0, then the entry number is 4K.
If AL_RAM_CONFIG = 1, then the entry number is 16K.
If AL_RAM_CONFIG = 2, then the entry number is 32K.
If AL_RAM_CONFIG = 3, then the entry number is 64K.
Type: Read/Write
Address =
base_address
+
entry_number
Format: Refer to the following table.
VCC_ENTRY
(14)
Indicates that at least one valid VCC is referenced in the table pointed to by this entry. Initial-
ize to the proper setting.
VCI_BITS
(13:10)
The number of VCI bits to use minus 1. The valid entries are 15 down to 4.
BLOCK_OFFSET
(9:0)
The offset
÷
32 within the channel number block for this VI/VP within the channel number
table. For AL_RAM_CONFIG = 3 (refer to
“AL_RAM_CONFIG” on page 105
), a
BLOCK_OFFSET(10) bit is needed. If VCI_BITS = F
h
, then BLOCK_OFFSET(10) = 0. Oth-
erwise, BLOCK_OFFSET(10) = incoming cell VPI (0).
Field (Bits)
Description
Not present
(31:16)
RAM is not present in these bit locations.
Not used
(15:14)
Write with a 0 to maintain software compatibility with future versions.
RX_CHAN_NUM
(13:0)
The receive channel number.
Table 37. VI_VPI_TABLE Entry if VPC_ENTRY = 0 (Continued)
Field (Bits)
Description