7.7.9 CHI link layer flow control

CHI link layer flow control uses a counter on each link to track the number of outstanding link layer credits. The Cortex-A72 processor can receive a maximum of 15 link-layer credits on the TXREQ, TXRSP, and TXDAT links and issues a maximum of nine link layer credits on the RXSNP, RXRSP, and RXDAT links.
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