ARM Technical Support Knowledge Articles

General: Is HREADY an input or an output from slaves?

Applies to: AHB


An AHB slave must have the HREADY signal as both an input and an output.

HREADY is required as an output from a slave so that the slave can extend the data phase of a transfer.

HREADY is also required as an input so that the slave can determine when the previously selected slave has completed its final transfer and the first data phase transfer for this slave is about to commence.

Each AHB Slave should have an HREADY output signal (conventionally named HREADYOUT) which is connected to the Slave-to-Master Multiplexer. The output of this multiplexer is the global HREADY signal which is routed to all masters on the AHB and is also fed back to all slaves as the HREADY input.

See also:

Article last edited on: 2014-02-06 14:51:33

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