參數(shù)資料
型號: 03H4969
元件分類: 通信及網(wǎng)絡(luò)
英文描述: SPECIALTY TELECOM CIRCUIT, PQFP100
封裝: 14 X 20 MM, 2.70 MM HEIGHT, 0.65 MM PITCH, PLASTIC, FP-100
文件頁數(shù): 9/48頁
文件大?。?/td> 464K
代理商: 03H4969
Product Part Number: IBM22-ALDC1005S
ALDC1-5S
I B M Microelectronics
Document Number: DCALD5DSU-04
Data Compression
Data modeling may indicate that the probability
of data expansion is so small as to be non-
existent (for a specific application). In this
case, the application or system designer need
not be concerned about data expansion.
Note: If data expansion is a design concern,
then the following formula may be used to cal-
culate the maximum allowable transfer size for
a given compressed data buffer size:
XFRmax = INT(
8
9
(CDB
3))
where XFRmax is the maximum allowable
transfer size in bytes, CDB is the compressed
data buffer size in bytes, and INT(x) is the
integer function (sometimes called the floor
function). CDB is under the control of the appli-
cation or system designer. The compressed
data buffer is
not part of the ALDC1-5S. Rather,
in this document, the compressed data buffer
size describes the byte limit imposed on the
number compressed bytes output during a com-
pression operation. This limit might be
imposed because of bus, memory, real-time, or
other system constraints.
If no compressed data buffer size exists for the
design, or if the compressed data buffer size is
larger than 65,535 bytes, then XFRmax should be
set at 58,250.
(C) IBM CORP. 1993, 1994. ALL RIGHTS RESERVED. USE IS FURTHER SUBJECT TO THE PROVISIONS ON THE BACK OF THE TITLE PAGE.
3-7
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