AMD-K6-IIIE+550ACR AMD (ADVANCED MICRO DEVICES), AMD-K6-IIIE+550ACR Datasheet - Page 171

• Manufacturer Part Number: AMD-K6-IIIE+550ACR
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of AMD-K6-IIIE+550ACR

• Lead Free Status / RoHS Status: Not Compliant

23543A/0—September 2000
Chapter 6
STEP Field. This read-only field contains the stepping ID. This is
identical to the value returned by CPUID standard function 1 in
EAX[3:0].
EBF[2:0] Field. This read-only field contains the effective value of
the BF divisor supplied to the processor’s internal PLL, which
allows the BIOS to determine the frequency of the host bus. The
core frequency must first be determined using the Time Stamp
Counter (TSC) method (see “Time Stamp Counter” on page 46).
The core frequency is then divided by the processor-to-bus clock
ratio as determined by the EBF field (see Table 28). The result
is the frequency of the processor bus.
Table 28. Processor-to-Bus Clock Ratios
Notes:
1. The AMD-K6-IIIE+ processor does not support the 2.5x ratio supported by earlier AMD-K6 proces-
sors. Instead, a ratio of 2.0x is selected when EBF[2:0] equals 100b.
State of EBF[2:0]
AMD PowerNow!™ Technology
000b
100b
101b
110b
111b
001b
010b
011b
AMD-K6™-IIIE+ Embedded Processor Data Sheet
Processor-to-Bus Clock Ratio
2.0x
3.0x
6.0x
3.5x
4.5x
5.0x
4.0x
5.5x
1
149