ibm3206k0424 ETC-unknow, ibm3206k0424 Datasheet - Page 303

• Manufacturer Part Number: ibm3206k0424
• Description: Ibm Processor For Network Resources
• Manufacturer: ETC-unknow

Preliminary
SEGBF Block Diagram
The sequence of events that happens when an AAL5 frame is enqueued to SEGBF is as follows:
pnr25.chapt05.01
August 14, 2000
1. An initial check is made to determine if there is space available in the cell buffer. If no space is available,
2. When buffer space becomes available, the enqueued LCD address is requested from the transmit LCD
3. The initial instruction pointer (IP) is fetched from the LCD and loaded for both of the segmentation proces-
4. Assuming an AAL5 entry point is setup in the LCD, the segmentation logic will first initiate a memory fetch
5. While the data fetch is in process, the segmentation processors will update various fields in the LCD
processing stops for this drop until a cell buffer is freed by the link logic (LINKT).
cache (there are four entries in the LCD cache). The segmentation logic waits for a valid indication from
the cache; at this time all LCD information is available to the segmentation logic on the LCD cache inter-
face.
sors. Software controls what type of cells are generated by the segmentation logic by initializing this field
in the LCD to the entry points defined for different types of cell generation. For a more complete descrip-
tion of the segmentation entry points, refer to the seg_prc_Entry_point field in the transmit LCD data
structure section of this document.
of the data required to build the cell.
including statistics and the next segmentation pointer. Cell construction will be started using the ATM
CSKED LCD Interface
Drop 0 Cell 0
Drop 0 Cell 1
Drop 0 Cell 2
Drop 0 Cell 3
Drop 0
RAM
Processor
Drop 1 Cell 0
Drop 1 Cell 1
Drop 1 Cell 2
Drop 1 Cell 3
LCD
Drop 1
Cell Array
Drop 2 Cell 0
Drop 2 Cell 1
Drop 2 Cell 2
Drop 2 Cell 3
Drop 2
Processor
Cell
Software LCD Enq Interface
IBM Processor for Network Resources
ATM Transmit Buffer Segmentation (SEGBF)
Drop 3 Cell 0
Drop 3 Cell 1
Drop 3 Cell 2
Drop 3 Cell 3
RAM
Drop 3
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IBM3206K0424