2.1.1 Distributor AXI4-Stream interfaces

The GIC-600 uses AXI4-Stream interfaces to communicate between blocks.

These interfaces are fully credited.

Note:

  • ic<xy>tready xy can be cd, dc, pd, dp, id, di, rd, dr, or dw.
  • Packets must not be reordered between endpoints, for example, between the Distributor and a single Redistributor block, irrespective of the interconnect that is used. Packets must never be interleaved.

For information about AXI4-Stream signals, see the Arm®AMBA® 4 AXI4-Stream Protocol Specification.

For information about the TWAKE signal, see section E.2.9 of the Arm®AMBA® AXI and ACE Protocol Specification. The TWAKE signal is equivalent to the AWAKEUP signal.

The following table lists the AXI4-Stream input interfaces.

Table 2-1 AXI4-Stream input interface descriptions

Bus Destination Width ic<xy>dtid
ICID ITS to Distributor 16-bit or 64-bit ITS number
ICPD Redistributor to Distributor 16-bit, 32-bit, or 64-bit Redistributor number
ICCD SPI Collator to Distributor 16-bit 0
ICRD Remote Chip to Distributor 64-bit 0

The following table lists the AXI4-Stream output interfaces.

Table 2-2 AXI4-Stream output interface descriptions

Bus Destination Width ic<xy>dtdest
ICDI Distributor to ITS 16-bit or 64-bit ITS number
ICDP Distributor to Redistributor 16-bit, 32-bit, or 64-bit Redistributor number
ICDC Distributor to SPI Collator 16-bit 0
ICDR Distributor to Remote Chip 64-bit Programmed value
ICDW Distributor to Wake Request block 16-bit -

Each bus has an associated ic<xy>twakeup signal that requests wakeup through the qactive signals when the Distributor, or destination block, is hierarchically clock-gated through the Q-Channel. The ic<xy>twakeup input signal must be driven from a cleanly registered version of the ic<xy>tvalid signal to prevent spurious wakeups caused by signal glitches.

For information about the Distributor Q-Channels, see 2.1.4 Distributor Q-Channels.

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