Patent ID: 7340633

Claim:
A method of identifying a clock frequency of a system clock for the configuration of a peripheral device, the method comprising: a) providing a secondary clock at a predetermined clock frequency; b) applying the system clock and the secondary clock to a host; c) applying the system clock and the secondary clock to the peripheral device; d) determining the clock frequency of the system clock in the peripheral device using the second clock and based on the predetermined clock frequency; and e) configuring the peripheral device using the determined system clock; wherein the clock frequency of the system clock is variable at predetermined clock frequencies and further comprising a step of employing the host to determine the clock frequency after an initialization phase; and wherein step d) further comprises determining the clock frequency with a tolerance in the peripheral device, and then comparing, in the peripheral device, the determined clock frequency with the tolerance to a table of possible frequency values and selecting in the peripheral device the clock frequency of the system clock based on the comparison.