參數(shù)資料
型號(hào)： 03H5716
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(yè)數(shù)： 16/70頁(yè)
文件大?。?/td> 547K
代理商： 03H5716
Product Part Number: IBM22-ALDC1020S-01
ALDC1-20S-HA
I B M Microelectronics Division
Document Number: DCAL2HDSU-02
Data Compression
Figure
3-16. Reset Summary
+ADDR(4:1)
MNEMONIC
HARDWARE
RESET
OPCODE
X'A000': SOFT-
WARE RESET
DATA
TRANSFER
INITIALIZATION
X'0'
STAT
X'0000'
X'0080' (Busy)
OCNF
X'0000'
unchanged
CCNF
X'0000'
unchanged
X'1'
ECL
unchanged
OPOL
X'00FF'
unchanged
CPOL
X'00FF'
unchanged
X'2'
TCOH
X'0000'
X'3'
TCOL
X'0000'
X'4'
TCCH
X'0000'
X'5'
TCCL
X'0000'
X'6'
ERRS
X'0000'
X'7'
INTS
X'0000'
X'8'
CMND
X'0000'
unchanged
X'A'
XFRH
X'0000'
unchanged
X'B'
XFRL
X'0000'
unchanged
X'C'
DDCH
X'0000'
unchanged
X'D'
DDCL
X'0000'
unchanged
X'E'
EMSK
X'0000'
unchanged
X'F'
IMSK
X'0000'
unchanged
3.4 Data Expansion
Data expansion occurs when the size of the
data increases during a compression operation.
This is a rare occurrence because the
ALDC1-20S-HA adapts to the data being com-
pressed. However, the application or system
designer must be aware of data expansion and
consider its impact on system operation.
If data expansion causes the Compressed Data
Interface Transfer Count (TCC) to exceed
4,294,967,295 bytes, then the ALDC1-20S-HA
would set the TCC Overflow Error (ERRS(12)) bit
to B'1', set the Any Error (STAT(14)) bit to
B'1', assert the -IREQOD and +IREQPP outputs,
and cancel the transfer.
The ALDC1-20S-HA also has an Expansion
(STAT(12)) bit which may be used to detect data
expansion when no errors occur.
3.4.1 Worst Case Expansion
The ALDC compression algorithm approaches a
worst case of 12.5% data expansion. For
example, if a given system always compresses
60,000 byte data blocks, then there is a small
possibility that about 67,500 bytes may result
from a worst case compression operation.
Continuing with the example, the micro-
processor might detect that expansion occurred
and initiate recovery by transferring the original
60,000 bytes instead.
The example demonstrates how data expansion
might be handled at a system level. It is up to
the application or system designer to determine
the appropriate system response to data expan-
sion.
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.
(C) IBM CORP. 1993, 1994. ALL RIGHTS RESERVED. USE IS FURTHER SUBJECT TO THE PROVISIONS ON THE BACK OF THE TITLE PAGE.
3-13
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