DS566 Datasheet, PDF (6/38 Pages) Xilinx, Inc – PLBV46 Master

PLBV46 Master (v1.00a)
• Inputs to the Master Service (from IP Client)
- Command Request
- Command Starting PLB address
- Command Transfer Length limit (in bytes)
- Command BE designator (for single data beat requests)
- Command Size field (designates number of bytes transferred for each data beat of a burst
transfer)
- Command Type field (specifies Single Data Beat or Fixed Length Burst)
- Command Bus Lock (function not currently supported)
- Command Address Increment
- Reset Request
• Status outputs from the Master to the IP Client
- Command Acknowledge
- Command Complete
- Command Error
- Command PLB Rearbitrate
- Command Timeout
- Command Length Limit Count is Zero
The Command interface protocol requires that the IP Client drive the Request and the associated
qualifiers until the Command Acknowledge is received from the Master. Upon the receipt of the
Command Acknowledge the IP Client may stop asserting the Request and the qualifiers for the
command. If a problem occurs during the PLB Address Phase of a request, it is possible that a
Command Acknowledge will not occur. Instead the Master may reply with the Command Abort or
command Error status asserted in conjunction with assertion of the Command Complete status. This is
an indication to the IP Client that a non-recoverable error occurred and the transfer did not complete.
If a Command Acknowledge is asserted by the Master Service, then the Master has successfully
negotiated a PLB Address Phase and the corresponding data phase is in progress. When the Data Phase
completes, the Master will assert the Command Complete signal. If a Data Phase error is received from
the PLB Slave by the Master, the Command Error status will be also be asserted when the Command
Complete is asserted. The duration of the Command Complete assertion is one PLB clock period.
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DS566 April 24, 2009
Product Specification