AMD AMD-K6-2/500AFX Data Sheet - Page 112
BF[2:0] (Bus Frequency), Inputs, Internal Pullups
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AMD-K6®-2 Processor Data Sheet Preliminary Information 21850J/0-February 2000 4.10 Summary Sampled BF[2:0] (Bus Frequency) 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 18. BF[2:0] have weak internal pullups and default to the 3.5 multiplier if left unconnected. Table 18. Processor-to-Bus Clock Ratios State of BF[2:0] Inputs Processor-Clock to Bus-Clock Ratio 100b 2.5x 101b 3.0x 110b 2.0x or 6.0x* 111b 3.5x 000b 4.5x 001b 5.0x 010b 4.0x 011b 5.5x Note: * The ratio selected is dependent on the stepping of the Model 8. The 2.0x ratio is supported on the Model 8/[7:0], whereas the 6.0x ratio is supported on the Model 8/[F:8]. 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. 92 Signal Descriptions Chapter 4
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