2.1.6 Distributor miscellaneous signals

The Distributor generates or processes several signals, such as tie-offs, interrupts, and handshakes.

The following table shows the Distributor miscellaneous signals.

Table 2-5 Distributor miscellaneous signals

Signal Direction Description
chip_id Input Tie off this signal to identify the chip in the system. Only present if there is more than one chip in the system.
fault_int Output

These fault handling and error reporting interrupts are defined in Arm® Reliability, Availability, and Serviceability (RAS) Architecture Extension. The GIC-600 can deliver these interrupts internally but the outputs are provided for any other device such as a system control processor that does not receive normal interrupts from the GIC.

See 3.16 Reliability, Accessibility, and Serviceability.

err_int Output
pmu_int Output

The PMU counter overflow interrupt. This interrupt can be routed internally but is provided as an external output to trigger an external agent to service the GIC, for example, to read out the PMU counter snapshot registers.

See 3.15 Performance Monitoring Unit.

sample_req,

Input

This 4-phase handshake provides a hardware mechanism to snapshot the PMU counters and has the same effect as writing to the GICP_CAPR register.

sample_ack Output

gict_allow_ns,

Input

From reset, these tie-off signals control whether Non-secure software can access the GICT RAS, and the GICP PMU, pages. Secure software can override the values at any time.

gicp_allow_ns Input
gicd_page_offset Input

This tie-off signal is used to set the page address bits[x:16] of the GICD page. Only present in monolithic configurations.

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