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
文件頁數(shù)： 27/70頁
文件大小： 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
______
_________________________________________
\
/
-RESET
|\_____________/|
(input)
||
|
T1
|
T2
|
_______________________________________|
________
\
/
MCIN(0) or MCIN(1)
\_____________/
(-CS or -READ or -WRITE inputs)
Figure
4-8. Microprocessor Interface Hardware Reset
REF
DESCRIPTION
MIN
MAX
T1
-RESET active to -RESET inactive
4 clock cycles
T2
-RESET inactive to -CS or -READ or -WRITE
active
2 clock cycles
4.3 Original Data Interface and
Compressed Data Interface
Both the original data interface and the com-
pressed data interface operate in four modes.
These modes are described below.
Note: The original data interface and com-
pressed data interface are idependently config-
ured using the OCNF, OPOL, CCNF, and CPOL
registers. See pages 3-3 to 3-5 for more detail
on these registers.
Note: The following timing diagrams describe
the communication between the original data
interface or compressed data interface and the
external module connected to it. In all of these
timing diagrams, the Original Data Interface
Polarity (OPOL) and Compressed Data Interface
Polarity (CPOL) registers are assumed to be
reset to X'00FF'. This is their default state (ie.
negative active polarity). If any OPOL or CPOL
bits are changed, then the corresponding
control pin will be inverted from what is shown
in these timing diagrams (ie. positive active
polarity).
Original
OCIN
Data
OCOUT(5:0)
Interface
+ODATA(15:00)
+OPARITY(1:0)
Figure
4-9. Original Data Interface
Compressed
CCIN
Data
CCOUT(5:0)
Interface
+CDATA(15:00)
+CPARITY(1:0)
Figure
4-10. Compressed Data Interface
4.3.1 Four-edge Mode
This mode is an asynchronous data transfer in
which one or two bytes is transferred for every
request/acknowledge pair. As shown in
Figure 4-11 on page 4-10 and Figure 4-12 on
page 4-11, a typical four-edge transfer assumes
a request goes active to initiate the transfer,
the acknowledge then goes active in response
to the request, which leads to a withdrawal of
the request and finally the acknowledge is with-
drawn and data is transferred on the inacti-
vating edge of the acknowledge.
(C) IBM CORP. 1993, 1994. ALL RIGHTS RESERVED. USE IS FURTHER SUBJECT TO THE PROVISIONS ON THE BACK OF THE TITLE PAGE.
4-9
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