Glossary
ARM DDI 0301H Copyright © 2004-2009 ARM Limited. All rights reserved. Glossary-4
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Completed transfer
A transfer for which the xVALID/xREADY handshake is complete.
Payload The non-handshake signals in a transfer.
Transaction An entire burst of transfers, comprising an address, one or more data transfers and
a response transfer (writes only).
Transmit An initiator driving the payload and asserting the relevant xVALID signal.
Transfer A single exchange of information. That is, with one xVALID/xREADY
handshake.
The following AXI terms are master interface attributes. To obtain optimum performance, they
must be specified for all components with an AXI master interface:
Combined issuing capability
The maximum number of active transactions that a master interface can generate.
This is specified instead of write or read issuing capability for master interfaces
that use a combined storage for active write and read transactions.
Read ID capability
The maximum number of different ARID values that a master interface can
generate for all active read transactions at any one time.
Read ID width
The number of bits in the ARID bus.
Read issuing capability
The maximum number of active read transactions that a master interface can
generate.
Write ID capability
The maximum number of different AW ID values that a master interface can
generate for all active write transactions at any one time.
Write ID width
The number of bits in the AWI D and WID buses.
Write interleave capability
The number of active write transactions for which the master interface is capable
of transmitting data. This is counted from the earliest transaction.
Write issuing capability
The maximum number of active write transactions that a master interface can
generate.
1. The letter x in the signal name denotes an AXI channel as follows:
AW Write address channel.
W Write data channel.
B Write response channel.
AR Read address channel.
R Read data channel.
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