cn8237 Mindspeed Technologies, cn8237 Datasheet - Page 100

• Manufacturer Part Number: cn8237
• Description: Atm Oc-12 Servicesar Plus With Xbr Traffic Management
• Manufacturer: Mindspeed Technologies

Table 4-14. Transmit Queue Base Table Entry (32-bit)
4.0 Segmentation Coprocessor
4.3 Segmentation Control and Data Structures
4.3.5 Routing Tags
4-20
Table 4-15. Transmit Queue Base Table Entry Field Descriptions
Table 4-13. Transmit Queue Base Table Entry (64-bit)
Word 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Word 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
READ_UD_PNTR
UPDATE
READ
Reserved
0
1
0
Field Name
63 62 61 60 59 58 57 56 55 54 53 52 51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 32
Reserved
Reserved
Points to READ_UD used by host to prevent queue overflow. The SAR will write its read pointer into
the queue to this address periodically. (See
host as 8-byte entity with lower 4-bytes disabled.
NOTE(S):
1. MSTR_CTRL_DWORD must be set to 1.
2. Control structures (which SAR writes) with only double-word (64 bits) will be transferred as two
SAR position in update interval. Number of queue entries processed since last update of READ_UD.
SAR read pointer. Represents the SAR’s current position in the transmit queue.
Always set to 0.
32-bit words, unless FORCE64 is set.
Based upon the setting of CONFIG1(TAG_SIZE) field, routing tags need to be
prepended to the cell written into the TxFIFO.
routing tag tables and position in TxFIFO. The segmentation block writes either
4, 8, or 12 bytes into the TxFIFO, depending upon the size of tag required. The
UTOPIA block strips off the appropriate number of bytes to form the desired size
cell.
UTOPIA cell.
NOTE:
Table 4-17
The maximum TxFIFO size is reduced when using routing tags. See
Table
Mindspeed Technologies
UPDATE
UPDATE
4-16.
READ_UD_PNTR
READ_UD_PNTR
is a cross-reference between the routing tag table and the
ATM OC-12 ServiceSAR Plus with xBR Traffic Management
Chapter 2.0
Reserved
Description
Reserved
™
for details.) Read Update will be written to
Figures 4-7
through
READ
READ
28237-DSH-001-C
4-9
show the
CN8237