AMD-K6-2E Datasheet, PDF (111/332 Pages) Advanced Micro Devices – AMD-K6™-2E Embedded Processor

22529B/0—January 2000
Preliminary Information
AMD-K6™-2E Processor Data Sheet
5.10
BF[2:0] (Bus Frequency)
Pin Attributes
Pin Location
Summary
Inputs, Internal Pullups
See “Pin Designations by Functional Grouping” on page 301.
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 16. BF[2:0] have weak internal pullups and
default to the 3.5 multiplier if left unconnected.
Table 16. Processor-to-Bus Clock Ratios
State of BF[2:0] Inputs
100b
101b
111b
010b
000b
001b
011b
110b
Processor-Clock to Bus-Clock Ratio
2.5x
3.0x
3.5x
4.0x
4.5x
5.0x
5.5x
6.0x
Sampled
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
93