Altera Embedded Peripherals IP Manual do Utilizador Página 187

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Operation—Avalon-ST Packets to Bytes Converter Core
The Avalon-ST Packets to Bytes Converter core receives packetized data and transforms the packets to
bytestreams. The core constructs outgoing bytestreams by inserting appropriate special characters in the
following manner and sequence:
If the startofpacket signal on the core's source interface is asserted, the core inserts the following
special characters:
Channel number indicator (0x7c).
Channel number, escaping it if required.
Start of packet (0x7a).
If the endofpacket signal on the core's source interface is asserted, the core inserts an end of packet
(0x7b) before the last byte of data.
If the channel signal on the core’s source interface changes to a new value within a packet, the core
inserts a channel number indicator (0x7c) followed by the new channel number.
If a data byte is a special character, the core inserts an escape (0x7d) followed by the data XORed with
0x20.
Document Revision History
Table 19-2: Document Revision History
Date and Document
Version
Changes Made Summary of Changes
July 2014
v14.0.0
-Removed mention of SOPC Builder, updated
to Qsys
Maintenance Release
December 2010
v10.1.0
Removed the “Device Support”, “Instantiating
the Core in SOPC Builder”, and “Referenced
Documents” sections.
July 2010
v10.0.0
No change from previous release.
November 2009
v9.1.0
No change from previous release.
March 2009
v9.0.0
No change from previous release.
November 2008
v8.1.0
Changed to 8-1/2 x 11 page size. No change to
content.
May 2008
v8.0.0
Initial release.
UG-01085
2014.24.07
Operation—Avalon-ST Packets to Bytes Converter Core
19-3
Avalon-ST Bytes to Packets and Packets to Bytes Converter Cores
Altera Corporation
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