AMD AMD-K6-2/400 User Guide - Page 123
BF[2:0] (Bus Frequency
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23542A/0-September 2000 Preliminary Information AMD-K6™-2E+ Embedded Processor Data Sheet 5.10 BF[2:0] (Bus Frequency) Pin Attribute Summary Inputs, Internal Pullups BF[2:0] determine the internal operating frequency of the processor. The frequency of the CLK input signal is multiplied internally by a ratio determined by the state of these signals as defined in Table 17. BF[2:0] have weak internal pullups and default to the 3.5 multiplier if left unconnected. Sampled Table 17. Processor-to-Bus Clock Ratios State of BF[2:0] Inputs 100b 101b 110b 111b 000b 001b 010b 011b Processor-Clock to Bus-Clock Ratio 2.0x 3.0x 6.0x 3.5x 4.5x 5.0x 4.0x 5.5x BF[2:0] are sampled during the falling transition of RESET. They must meet a minimum setup time of 1.0 ms and a minimum hold time of two clocks relative to the negation of RESET. Chapter 5 Signal Descriptions 101