7.6. Unconnected slave interfaces

The CSTF is fixed as an eight-input device. Not all eight inputs might be required. When unused ports are present these must be suitably tied off as shown in Table 7.13. If ports are unconnected but not disabled, the operation is UNPREDICTABLE.

Table 7.13. Tie-offs for unconnected ports

Port nameTie-off value
ATIDSx[6:0]None required but a recommendation of 7'b0000000
ATDATASx[31:0]None required but a recommendation of 32'h00000000
ATVALIDSx1'b0
ATBYTESSx[1:0]None required but a recommendation of 2'b00
ATREADYSxNone required because this is an output
AFVALIDSxNone required because this is an output
AFREADYSx1'b1

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