參數(shù)資料
型號(hào): 28230-13
廠商: CONEXANT SYSTEMS
元件分類(lèi): 數(shù)字傳輸電路
英文描述: ATM SEGMENTATION AND REASSEMBLY DEVICE, PQFP208
封裝: PLASTIC, MQFP-208
文件頁(yè)數(shù): 106/237頁(yè)
文件大?。?/td> 3214K
代理商: 28230-13
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179
Bt8230
ATM Segmentation and Reassembly Controller—SAR
N8230DS1F
Example 2: 500 Active VCCs
Now suppose that there are 500 active VCCs instead of one and the
same average rate of buffer completion of 10 buffers every 0.5 ms still
exists. Due to the asynchronous nature of multiple VCCs, there is a
potential peak rate of buffer completion much greater than the average.
In the extreme case of two-cell PDUs, half of the cells transmitted will
precipitate a status queue entry. Therefore, out of 600 successive cells,
300 would result in status queue writes. At an STS-3c line rate, this
would occur in 2.74
s/cell * 600 cells = 1.64 ms. If this occurred with a
queue size of 256 and a host polling interval of 5 ms, it is likely that seg-
mentation would stall until the host processed the status queue. Increas-
ing the queue size to the next largest size, 1024, would eliminate the stall
and increase system performance. If the host was interrupt driven, it may
be able to keep up sufficiently with the burst to operate with a minimum
queue size of 256. This might not be the case if the host incurs large
latency times with its interrupt service routine.
The host status queue size is fixed by setting the MAXHS field in the
SEG_CTRL register to the corresponding two bits from Table B-1 on page 177.
B.4 SEG Local Status Queue
Each segmentation local status queue entry indicates that a local memory buffer
has been completely segmented. The size of this queue is determined according to
the same guidelines given for the SEG Host Status Queue, but is related to PDUs
segmented from local memory. The local status queue size is fixed by setting the
MAXLS field in the SEG_CTRL register according to Table B-1 on page 177.
B.5 SEG Reserved Area
The segmentation coprocessor requires this space in local memory to store inter-
nal state information. Two 2-bit fields in the SEG_CTRL register, MAXI and
MAXPND, are used to define the size of this space according to the following
equation:
reserved space required = (MAXIsize + MAXPNDsize) * 4 bytes
MAXIsize and MAXPNDsize are encoded according to Table B-1. MAXIsize
dictates the maximum intercell interval for segmentation PDUs. In other words, it
determines the slowest possible cell rate for all rate based VCCs. Specifically,
1/MAXIsize is the minimum cell rate. Using Table B-1, the smallest MAXIsize
which allows the desired minimum cell rate should be chosen. MAXPNDsize dic-
tates how many active VCCs are allowed. As a general guideline, set MAXPND-
size according to the maximum number of simultaneously segmenting VBR
VCCs.
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