A.8.2 Per-channel interface signals

This section describes the signals in each channel interface. For communication between devices, each of the channels includes a Transmit (TX) and a Receive (RX) port, with signals traveling from TX to RX.

Note:

Connection of CHI interfaces between two devices requires cross-coupling of the TX* and RX* signals between the two devices, as required by the CHI architecture. Table A-21 Transmit Request channel signals to Table A-41 SACTIVE interface signals describe this cross-coupling.

The following table shows the Transmit Request channel signals.

Table A-21 Transmit Request channel signals

Signal Type Description Connection information
TXREQFLITPEND Output Transmit Request Early Flit Valid hint Connect to RXREQFLITPEND of the corresponding CHI device, if populated
TXREQFLITV Output Transmit Request Flit Valid Connect to RXREQFLITV of the corresponding CHI device, if populated
TXREQFLIT[x:0]a Output Transmit Request Flit Connect to RXREQFLIT of the corresponding CHI device, if populated
TXREQLCRDV Input Transmit Request channel link layer credit Connect to RXREQLCRDV of the corresponding CHI device, if populated, otherwise tie LOW

The following table shows the Transmit Response channel signals.

Table A-22 Transmit Response channel signals

Signal Type Description Connection information
TXRSPFLITPEND Output Transmit Response Early Flit Valid hint Connect to RXRSPFLITPEND of the corresponding CHI device, if populated
TXRSPFLITV Output Transmit Response Flit Valid Connect to RXRSPFLITV of the corresponding CHI device, if populated
TXRSPFLIT[44:0] Output Transmit Response Flit Connect to RXRSPFLIT of the corresponding CHI device, if populated
TXRSPLCRDV Input Transmit Response channel link layer credit Connect to RXRSPLCRDV of the corresponding CHI device, if populated, otherwise tie LOW

The following table shows the Transmit Snoop channel signals.

Table A-23 Transmit Snoop channel signals

Signal Type Description Connection information
TXSNPFLITPEND Output Transmit Snoop Early Flit Valid hint Connect to RXSNPFLITPEND of the corresponding CHI device, if populated
TXSNPFLITV Output Transmit Snoop Flit Valid Connect to RXSNPFLITV of the corresponding CHI device, if populated
TXSNPFLIT[64:0] Output Transmit Snoop Flit Connect to RXSNPFLIT of the corresponding CHI device, if populated
TXSNPLCRDV Input Transmit Snoop channel link layer credit Connect to RXSNPLCRDV of the corresponding CHI device, if populated, otherwise tie LOW

The following table shows the Transmit Data channel signals.

Table A-24 Transmit Data channel signals

Signal Type Description Connection information
TXDATFLITPEND Output Transmit Data Early Flit Valid hint Connect to RXDATFLITPEND of the corresponding CHI device, if populated
TXDATFLITV Output Transmit Data Flit Valid Connect to RXDATFLITV of the corresponding CHI device, if populated
TXDATFLIT[193:0] Output Transmit Data Flit Connect to RXDATFLIT of the corresponding CHI device, if populated
TXDATLCRDV Input Transmit Data channel link layer credit Connect to RXDATLCRDV of the corresponding CHI device, if populated, otherwise tie LOW

The following table shows the Receive Request channel signals.

Table A-25 Receive Request channel signals

Signal Type Description Connection information
RXREQFLITPEND Input Receive Request Early Flit Valid hint Connect to TXREQFLITPEND of the corresponding CHI device, if populated, otherwise tie LOW
RXREQFLITV Input Receive Request Flit Valid Connect to TXREQFLITV of the corresponding processor, if populated, otherwise tie LOW
RXREQFLIT[x:0]b Input Receive Request Flit Connect to TXREQFLIT of the corresponding CHI device, if populated, otherwise tie LOW
RXREQLCRDV Output Receive Request channel link layer credit Connect to TXREQLCRDV of the corresponding CHI device, if populated

The following table shows the Receive Response channel signals.

Table A-26 Receive Response channel signals

Signal Type Description Connection information
RXRSPFLITPEND Input Receive Response Early Flit Valid hint Connect to TXRSPFLITPEND of the corresponding CHI device, if populated, otherwise tie LOW
RXRSPFLITV Input Receive Response Flit Valid Connect to TXRSPFLITV of the corresponding processor, if populated, otherwise tie LOW
RXRSPFLIT[44:0] Input Receive Response Flit Connect to TXRSPFLIT of the corresponding CHI device, if populated, otherwise tie LOW
RXRSPLCRDV Output Receive Response channel link layer credit Connect to TXRSPLCRDV of the corresponding CHI device, if populated

The following table shows the Receive Snoop channel signals.

Table A-27 Receive Snoop channel signals

Signal Type Description Connection information
RXSNPFLITPEND Input Receive Snoop Early Flit Valid hint Connect to TXSNPFLITPEND of the corresponding CHI device, if populated, otherwise tie LOW
RXSNPFLITV Input Receive Snoop Flit Valid Connect to TXSNPFLITV of the corresponding processor, if populated, otherwise tie LOW
RXSNPFLIT[64:0] Input Receive Snoop Flit Connect to TXSNPFLIT of the corresponding CHI device, if populated, otherwise tie LOW
RXSNPLCRDV Output Receive Snoop channel link layer credit Connect to TXSNPLCRDV of the corresponding CHI device, if populated

The following table shows the Receive Data channel signals.

Table A-28 Receive Data channel signals

Signal Type Description Connection information
RXDATFLITPEND Input Receive Data Early Flit Valid hint Connect to TXDATFLITPEND of the corresponding CHI device, if populated, otherwise tie LOW
RXDATFLITV Input Receive Data Flit Valid Connect to TXDATFLITV of the corresponding processor, if populated, otherwise tie LOW
RXDATFLIT[193:0] Input Receive Data Flit Connect to TXDATFLIT of the corresponding CHI device, if populated, otherwise tie LOW
RXDATLCRDV Output Receive Data channel link layer credit Connect to TXDATLCRDV of the corresponding CHI device, if populated

The following table shows the Transmit Request channel signals in configurations with optional Device to XP Source Synchronous Bridges (DSSBs).

Table A-29 Transmit Request channel signals with optional DSSBs

Signal Type Description Connection information
TXREQFLITPEND Output Transmit Request Early Flit Valid hint Connect to RXREQFLITPEND of the corresponding CHI device, if populated
TXREQFLITV Output Transmit Request Flit Valid Connect to RXREQFLITV of the corresponding CHI device, if populated
TXREQFLIT[x:0]c Output Transmit Request Flit Connect to RXREQFLIT of the corresponding CHI device, if populated
TXREQLCRDPTR[7:0] Input Transmit Request channel link layer pointer Connect to RXREQLCRDPTR[7:0] of the corresponding DSSB

The following table shows the Transmit Response channel signals in configurations with optional DSSBs.

Table A-30 Transmit Response channel signals with optional DSSBs

Signal Type Description Connection information
TXRSPFLITPEND Output Transmit Response Early Flit Valid hint Connect to RXRSPFLITPEND of the corresponding CHI device, if populated
TXRSPFLITV Output Transmit Response Flit Valid Connect to RXRSPFLITV of the corresponding CHI device, if populated
TXRSPFLIT[44:0] Output Transmit Response Flit Connect to RXRSPFLIT of the corresponding CHI device, if populated
TXRSPLCRDPTR[7:0] Input Transmit Response channel link layer pointer Connect to RXRSPLCRDPTR[7:0] of the corresponding DSSB

The following table shows the Transmit Snoop channel signals in configurations with optional DSSBs.

Table A-31 Transmit Snoop channel signals with optional DSSBs

Signal Type Description Connection information
TXSNPFLITPEND Output Transmit Snoop Early Flit Valid hint Connect to RXSNPFLITPEND of the corresponding CHI device, if populated
TXSNPFLITV Output Transmit Snoop Flit Valid Connect to RXSNPFLITV of the corresponding CHI device, if populated
TXSNPFLIT[64:0] Output Transmit Snoop Flit Connect to RXSNPFLIT of the corresponding CHI device, if populated
TXSNPLCRDPTR[7:0] Input Transmit Snoop channel link layer pointer Connect to RXSNPLCRDPTR[7:0] of the corresponding DSSB

The following table shows the Transmit Data channel signals in configurations with optional DSSBs.

Table A-32 Transmit Data channel signals with optional DSSBs

Signal Type Description Connection information
TXDATFLITPEND Output Transmit Data Early Flit Valid hint Connect to RXDATFLITPEND of the corresponding CHI device, if populated
TXDATFLITV Output Transmit Data Flit Valid Connect to RXDATFLITV of the corresponding CHI device, if populated
TXDATFLIT[193:0] Output Transmit Data Flit Connect to RXDATFLIT of the corresponding CHI device, if populated
TXDATLCRDPTR[7:0] Input Transmit Data channel link layer pointer Connect to RXDATLCRDPTR[7:0] of the corresponding DSSB

The following table shows the Receive Request channel signals in configurations with optional DSSBs.

Table A-33 Receive Request channel signals with optional DSSBs

Signal Type Description Connection information
RXREQFLITPEND Input Receive Request Early Flit Valid hint Connect to TXREQFLITPEND of the corresponding CHI device, if populated, otherwise tie LOW
RXREQFLITV Input Receive Request Flit Valid Connect to TXREQFLITV of the corresponding processor, if populated, otherwise tie LOW
RXREQFLIT[x:0]d Input Receive Request Flit Connect to TXREQFLIT of the corresponding CHI device, if populated, otherwise tie LOW
RXREQLCRDPTR[7:0] Input Receive Request channel link layer pointer Connect to TXREQLCRDPTR[7:0] of the corresponding DSSB

The following table shows the Receive Response channel signals in configurations with optional DSSBs.

Table A-34 Receive Response channel signals with optional DSSBs

Signal Type Description Connection information
RXRSPFLITPEND Input Receive Response Early Flit Valid hint Connect to TXRSPFLITPEND of the corresponding CHI device, if populated, otherwise tie LOW
RXRSPFLITV Input Receive Response Flit Valid Connect to TXRSPFLITV of the corresponding processor, if populated, otherwise tie LOW
RXRSPFLIT[44:0] Input Receive Response Flit Connect to TXRSPFLIT of the corresponding CHI device, if populated, otherwise tie LOW
RXRSPLCRDPTR[7:0] Input Receive Response channel link layer pointer Connect to TXRSPLCRDPTR[7:0] of the corresponding DSSB

The following table shows the Receive Snoop channel signals in configurations with optional DSSBs.

Table A-35 Receive Snoop channel signals with optional DSSBs

Signal Type Description Connection information
RXSNPFLITPEND Input Receive Snoop Early Flit Valid hint Connect to TXSNPFLITPEND of the corresponding CHI device, if populated, otherwise tie LOW
RXSNPFLITV Input Receive Snoop Flit Valid Connect to TXSNPFLITV of the corresponding processor, if populated, otherwise tie LOW
RXSNPFLIT[64:0] Input Receive Snoop Flit Connect to TXSNPFLIT of the corresponding CHI device, if populated, otherwise tie LOW
RXSNPLCRDPTR[7:0] Input Receive Snoop channel link layer pointer Connect to TXSNPLCRDPTR[7:0] of the corresponding DSSB

The following table shows the Receive Data channel signals in configurations with optional DSSBs.

Table A-36 Receive Data channel signals with optional DSSBs

Signal Type Description Connection information
RXDATFLITPEND Input Receive Data Early Flit Valid hint Connect to TXDATFLITPEND of the corresponding CHI device, if populated, otherwise tie LOW
RXDATFLITV Input Receive Data Flit Valid Connect to TXDATFLITV of the corresponding processor, if populated, otherwise tie LOW
RXDATFLIT[193:0] Input Receive Data Flit Connect to TXDATFLIT of the corresponding CHI device, if populated, otherwise tie LOW
RXDATLCRDPTR[7:0] Input Receive Data channel link layer pointer Connect to TXDATLCRDPTR[7:0] of the corresponding DSSB

 

a x = 99 if RSVDC width is 4 bits, x = 103 if RSVDC width is 8 bits.
b x = 99 if RSVDC width is 4 bits, x = 103 if RSVDC width is 8 bits.
c x = 99 if RSVDC width is 4 bits, x = 103 if RSVDC width is 8 bits.
d x = 99 if RSVDC width is 4 bits, x = 103 if RSVDC width is 8 bits.
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