RS8234 Mindspeed Technologies, RS8234 Datasheet - Page 75

• Manufacturer Part Number: RS8234
• Description: Atm Servicesar Plus With Xbr Traffic Management
• Manufacturer: Mindspeed Technologies

RS8234
ATM ServiceSAR Plus with xBR Traffic Management
3.3.2 Write-only Status Queues
Table 3-3. Write-only Status Queue Variables
28234-DSH-001-B
WRITE
READ_UD
READ
INTERVAL
UPDATE
READ_UD_PNTR
Variable
3.3.2.1 Control
Variables
Current SAR position in queue
Last known host position in queue as seen by
SAR
Current host position in queue
Number of queue entries processed by host
before writing READ_UD
Number of queue entries since last write of
READ_UD
Host pointer to READ_UD
The SAR reports status to the host through write-only status queues. Both the
segmentation and reassembly coprocessors use their own format of status queue.
However, the RS8234 manages all status queues with the same algorithm.
location defined within the base table for each queue. The host must assign word
aligned (4-byte) status queue base addresses. To support multiple clients, the
RS8234 provides 32 queues of each type. The SAR and host manage each queue
independently through queue management variables. The SAR stores its variables
in internal base table registers. The host maintains its variables in its driver. Each
queue contains a programmable number of queue entries.
Table 3-3
These queues reside in host memory, or optionally SAR shared memory, at a
Mindspeed Technologies
describes the variables for write-only status queue management.
Definition
™
SAR Base Table
SAR Base Table
Host Variable
Host Variable
Host Variable
Host Variable
Location
3.3 Write-Only Control and Status
3.0 Host Interface
Initialization
Host defined
&READ_UD
0
0
0
0
3-9