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4.10. ACE AC channel

Table 4.10 shows the ACE AC channel protocol rules.

Table 4.10. ACE AC channel
AssertionDescriptionAMBA AXI and ACE Protocol Specification reference
ACE_ERRS_ACVALID_STABLEWhen ACVALID is asserted, it must remain asserted until ACREADY is assertedC2.3.3
ACE_ERRS_ACADDR_STABLEAC payload signals must remain stable while ACVALID is asserted, and ACREADY is de-assertedC3.6.2
ACE_ERRS_ACSNOOP_STABLEACSNOOP must be stable when ACVALID is assertedC3.6.2
ACE_ERRS_ACPROT_STABLEACPROT must be stable when ACVALID is assertedC3.6.2
ACE_ERRS_ACADDR_XA value of X on ACADDR is not permitted when ACVALID is HIGHC3.6.2
ACE_ERRS_ACSNOOP_XA value of X on ACSNOOP is not permitted when ACVALID is HIGHC3.6.2
ACE_ERRS_ACPROT_XA value of X on ACPROT is not permitted when ACVALID is HIGHC3.6.2
ACE_ERRS_ACVALID_XWhen not in reset, a value of X on ACVALID is not permittedC2.3.3
ACE_ERRM_ACREADY_XWhen not in reset, a value of X on ACREADY is not permittedC2.3.3
ACE_ERRS_ACSNOOPWhen ACVALID is asserted, ACSNOOP must be one of the legal valuesTable C3-19
ACE_ERRS_AC_ALIGNWhen ACVALID is asserted, ACADDR must be data width-alignedC3.6.2
ACE_RECM_ACREADY_MAX_WAITACREADY should be asserted within MAXWAITS cycles of ACVALID being asserted-

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