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The unregistered input signals are:
nRESET, and nHRESET
CLKENS0, CLKENS1, and CLKENS2
HCLKENM0, HCLKENM1, and HCLKENM2
HREADYM0, HREADYM1, HREADYM2
DATARD, DATAPRD, and DATAERR.
The unregistered output signals are:
HREADYS0, HREADYS1, and HREADYS2
HRESPS0, HRESPS1, and HRESPS2.
Figure B.1 shows the cache controller target timing parameters for unregistered signals. The timing parameter T is the internal clock latency of the clock buffer tree, dependent on process technology and design parameters. Timing parameters ending with suffix h represent hold times. Timing parameters ending with suffix d represent delay times. Contact your silicon supplier for more details.
Actual clock frequencies and input and output timing constraints vary according to application requirements and the silicon process technologies used. The maximum operating clock frequencies attained by ARM devices increases over time as a result.