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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)： | 8/48頁 |
| 文件大?。?/td> | 464K |
| 代理商： | 03H4969 |
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Product Part Number: IBM22-ALDC1005S
ALDC1-5S
I B M Microelectronics
Document Number: DCALD5DSU-04
Data Compression
3.3 Resets
There is one hardware reset for ALDC1-5S.
When asserted, all registers (except ECL) are
reset to zero, current operations are cancelled,
and the history buffer is cleared.
There is one software reset for ALDC1-5S. The
software reset is identical to the hardware reset
except that the Command (CMND) register is
not changed.
Figure 3-11 summarizes the hardware and soft-
ware resets for ALDC1-5S. Because some reg-
ister's contents are modified during
initialization for data transfer operations, this
information is also included in the figure below.
Figure
3-11. Effect of Reset on ALDC1-5S Registers.
UPADDR
MNEMONIC
HARDWARE
RESET
OPCODE X'A0':
SOFTWARE
RESET
DATA
TRANSFER
INITIALIZATION
X'0'
STAT
X'00'
X'80' (Busy)
X'1'
ECL
unchanged
X'2'
TCOH
X'00'
X'3'
TCOL
X'00'
X'4'
TCCH
X'00'
X'5'
TCCL
X'00'
X'6'
ERRS
X'00'
X'8'
CMND
X'00'
unchanged
X'A'
XFRH
X'00'
unchanged
X'B'
XFRL
X'00'
unchanged
X'F'
CCNF
X'00'
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
ALDC1-5S 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 65,535
bytes, then the ALDC1-5S would set the TCC
Overflow Error (ERRS(3)) bit to one, set the Any
Error (STAT(1)) bit to one, assert the -UPIRQ
output, and cancel the transfer.
The ALDC1-5S also has an Expansion (STAT(3))
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. The
Compressed Data Interface Transfer Count
(TCC) would exceed 65,535 in this case, and the
ALDC1-5S would cancel the compression oper-
ation with the TCC Overflow error. Continuing
with the example, the microprocessor might
detect that an error 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.
(C) IBM CORP. 1993, 1994. ALL RIGHTS RESERVED. USE IS FURTHER SUBJECT TO THE PROVISIONS ON THE BACK OF THE TITLE PAGE.
3-6
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