參數(shù)資料
型號: 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
文件頁數(shù): 70/70頁
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
transfer, reset ALDC1-20S-HA (and retry the
transfer), and/or report the failure.
If a hold opcode occurs during a data
transfer operation, then the interrupt output
is asserted and Hold (STAT(6)) bit is set to
B'1' after the current processing step. The
microprocessor may at a later time issue a
resume opcode to continue the data
transfer operation.
Note: A resume opcode must come
directly after a hold opcode.
If a hardware reset or a reset opcode
occurs during a data transfer operation,
then the history buffer is cleared, the micro-
processor interface registers are reset to
X'0000' as appropriate, and the transfer is
ended.
2.2.2 Start Compression Bypass
The original data interface receives data from
the external original data bus and sends it to
the encoder bypass. The encoder bypass
sends the data without modification to the com-
pressed data interface. The compressed data
interface sends the original data to the external
compressed data bus.
2.2.3 Start Compression
The original data interface receives data from
the external original data bus and sends it to
the encoder bypass. The encoder bypass
sends the data to the ALDC encoder. The
ALDC encoder compresses the data and sends
it to the encoder bypass (using a different port).
The encoder bypass sends the compressed
data to the compressed data interface. The
compressed data interface sends the com-
pressed data to the external compressed data
bus.
2.2.4 Start Decompression Bypass
The compressed data interface receives data
from the external compressed data bus and
sends it to the decoder bypass. The decoder
bypass sends the data without modification to
the original data interface. The original data
interface sends the unaltered data to the
external original data bus.
2.2.5 Start Decompression
The compressed data interface receives com-
pressed data from the external compressed
data bus and sends it to the decoder bypass.
The decoder bypass sends the data to the
ALDC decoder. The ALDC decoder decom-
presses the data and sends it to the decoder
bypass (using a different port). The decoder
bypass sends the decompressed data to the
original data interface. The original data inter-
face sends the decompressed data to the
external original data bus.
2.2.6 Start Decompression Output
Disabled
The compressed data interface receives com-
pressed data from the external compressed
data bus and sends it to the decoder bypass.
The decoder bypass sends the data to the
ALDC decoder. The ALDC decoder decom-
presses the data and sends it to the decoder
bypass (using a different port). The decoder
bypass sends the decompressed data to the
original data interface. The original data inter-
face counts decompressed bytes but does not
send the decompressed data to the external
original data bus until the Original Data Inter-
face Transfer Count (TCO) register is greater
than the Data Disable Count (DDC) register.
When TCO is greater than DDC, the original
data interface sends the remaining decom-
pressed data to the external original data bus.
Note: If OCNF(10) is set to B'1' and DDC is an
odd number, then when TCO
equals DDC the
original data interface sends the remaining
decompressed data to the external original data
bus. This is done to maintain proper byte align-
ment.
(C) IBM CORP. 1993, 1994. ALL RIGHTS RESERVED. USE IS FURTHER SUBJECT TO THE PROVISIONS ON THE BACK OF THE TITLE PAGE.
2-3
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