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VLYNQ 2.0 Packet Format
A.3.1 | Idle (/I/) |
The idle ordered sets are transmitted continuously and repetitively whenever the serial interface is idle. Idle is also used in the place of the flowed code in VLYNQ versions 2.0 and later.
A.3.2 End of Packet (/T/)
An end of packet delimiter delineates the ending boundary of a packet.
A.3.3 Byte Disable (/M/)
The byte disable symbol masks bytes for write operations.
A.3.4 Flow Control Enable (/P/)
A flow control enable request is transmitted when a VLYNQ module’s receive FIFO is full or nearly full. This code causes the remote VLYNQ device to cease transmission of data.
A.3.5 Flow Control Disable (/C/)
The flow control disable request is transmitted by a VLYNQ module when RX FIFO resources are available to accommodate additional data.
A.3.6 Error Indication (/E/)
The error indication is transmitted when errors are detected within a packet. Examples of such errors include illegal packet types and code groups.
A.3.7 | Init0 (/0/) |
The Init0 code group is used during the link initialization sequence. VLYNQ 2.0 and later versions use this code with an extra byte for identifying version 1.X devices.
A.3.8 | Init1 (/1/) |
The Init1code group is used during the Link initialization sequence. VLYNQ 2.0 and later uses this code with an extra byte for identifying version 1.X devices.
A.3.9 | Link (/L/) |
The link code group is used during the link initialization sequence. A link code group is also transmitted each time the internal link timer expires.
A.4 VLYNQ 2.0 Packet Format
The VLYNQ 2.0 packet format is shown in Figure
10bits
Figure A-1. Packet Format (10-bit Symbol Representation)
10bits | 10bits | <4*10bits | N*10bits |
10bits
cmd1
cmd2
bytecnt
address
data
eop
pkttype
adrmask
40 | VLYNQ Protocol Specifications | SPRU938B |
