ARM Technical Support Knowledge Articles

Arbitration: When can the HGRANT signal change?

Applies to: AHB

Answer

The HGRANT signal can change in any cycle and the following cases are possible:

  • It is possible that the HGRANT signal may be asserted and then removed before the current transfer completes. This is acceptable because the HGRANT signal is only sampled by masters when HREADY is high.
  • A master can be granted the bus without requesting it.
  • The above point also means that it is possible to be granted the bus in the same cycle that it is requested. This can occur if the master is coincidentally granted the bus in the same cycle that it requests it.

See also:

Article last edited on: 2014-02-06 07:45:27

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