10.1. About the AC parameters

This section provides information about the AC parameters.

Each group of parameters is provided with a figure showing the parameter relationships and a table listing the parameters in alphabetic order.

All of the parameters used in this chapter are shown in Table 10.9 with relevant cross references.

The figures quoted are relative to the rising clock edge after the clock skew for internal buffering has been added. Percentages given as 0% hold time require a positive hold relative to the top-level clock input. The amount of hold time required is equal to the internal clock skew.

Prefixes to signal groups and names are used as part of the timing parameter symbols. They are:

Tih

The percentage of one clock cycle from the rising clock edge that an input must be held for.

Tis

The percentage of one clock cycle to the rising clock edge that an input must be setup for.

Toh

The percentage of one clock cycle from the rising clock edge that an output is held for.

Tov

The percentage of one clock cycle from the rising clock edge before an output becomes valid.

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