參數(shù)資料
型號(hào)： ZR36060
廠商： Zoran Corporation
元件分類： Codec
英文描述： Integrated JPEG Codec(集成JPEG編解碼器)
中文描述： 綜合JPEG編解碼器（集成的JPEG編解碼器）
文件頁(yè)數(shù)： 20/46頁(yè)
文件大?。?/td> 307K
代理商： ZR36060
18
Integrated JPEG CODEC
decompression), and therefore the transfer can be successfully
completed. A host using this signal must not terminate the RD or
WR strobe before the ZR36060 acknowledges the cycle by
asserting ACK. This can actually stall the host in the middle of a
compressed data stream, or between compressed data fields in
the case of continuous operation, if the host attempts to read (or
write) the FIFO while it is completely empty (or full).
The system must be designed to use CBUSY or ACK output
signal as a handshake, but not both. Maximum code transfer rate
performance is achieved when using CBUSY handshake and
16-bit code bus width.
The host also has access to a status register to interrogate the
full/empty status of the internal code FIFO via the CBUSY bit
(positive logic as opposed to the CBUSY pin state), and to a pair
of read-only bits, CFIFO[1:0], which indicate the fullness of the
code FIFO as follows:
CFIFO[1:0] == 00b: less than 1/4 of the FIFO is occupied.
CFIFO[1:0] == 01b: less than 1/2 but more than (or exactly)
1/4 of the FIFO is occupied.
CFIFO[1:0] == 10b: less than 3/4 but more than (or exactly)
1/2 of the FIFO is occupied.
CFIFO[1:0] == 11b: more than (or exactly) 3/4 of the FIFO is
occupied.
Using this register, the host can work in a polling method
(instead of using the CBUSY or ACK signals), to determine when
it should momentarily stop the code transfer. However, the
system must guarantee minimum RD and WR strobe widths as
specified in the AC Characteristics.
The CFIFO[1:0] status bits are not valid after the EOI (end of
code stream) signal and status bit has been asserted.
After the last code word is input (in decompression) or output (in
compression), the ZR36060 asserts the EOI signal, indicating
the end of the code stream with the End-Of-Image marker.
5.2.1 Host abort of a code read or write cycle
During the compression or decompression process the host
must obey the handshake rules to create a valid code file. The
host, however, can safely abort (e.g.- due to a timeout) a RD or
WR cycle only after the EOI signal is asserted. If a code transfer
cycle is aborted by the host in the midst of a compression or
decompression process, the behavior of the ZR36060 will be
unpredictable, and the ZR36060 must be reset to resume normal
operation.
Figure 23 shows an example of a code transfer abort after EOI
is asserted.
5.2.2 Data alignment in Code Slave mode
In compression, in code slave mode, the ZR36060 always com-
pletes the compressed data file for each field so that it is 32-bit
(double-word) aligned. This is true for both 8-bit and 16-bit inter-
face modes. A variable number of padding bytes of value 0xFF
are appended by the ZR36060 after the EOI marker, to complete
the last double word. In decompression, such padding bytes
The host reads the status register, receives ACK normally.
The host writes some code bytes (not necessarily two), and the ZR36060 asserts ACK normally. After the second code write
cycle, the ZR36060 senses the end-of-image code indicating the last code byte of the current field and asserts CBUSY.
In this example the host reads a status register, and ACK is granted, independently of CBUSY state.
This is an access to the code FIFO while CBUSY is asserted. No ACK can be issued by the ZR36060, until after the beginning
of the next field. The host is stalled for a while, then decides to abort the cycle, i.e.- release the WR strobe without ACK form
the ZR36060. The ZR36060 senses this situation as an abort of the cycle and ignores the strobe. Again note, that this is only
allowed while EOI is asserted, and not in the middle of the process.
The host now decides to read a status register. This operation is completed normally.
The host writes code into the ZR36060. The ZR36060 has already started decompressing a new field, so CBUSY and EOI are
released and ACK can be issued.
Figure 23. Example of ZR36060 Interleaved Code/Data Accesses and Abort of Access
CS
ADDR[1:0]
RD
Notes:
1.
2, 3.
4.
5.
6.
7.
WR
ACK
CBUSY
EOI
DATA[7:0]
CODE[7:0]
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Data Out
Code In
Code In
Data Out
Try Code In… FAIL!
Data Out
Code In
CFIFO Full
No ACK =
Ignored
11
00
11
00
11
00
1
4
6
2
3
5
7
This example shows status register reads
interleaved with code FIFO write transactions.
After the end-of-image code, instead of waiting
too long (for the ACK signal) until the next field,
the host can decide to abort the cycle.
相關(guān)PDF資料
PDF描述
ZR36060 Circular Connector; No. of Contacts:19; Series:; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:14; Circular Contact Gender:Socket; Circular Shell Style:Cable Receptacle; Insert Arrangement:14-19
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