AMD AMD-K6-2/400 User Guide - Page 168
EPM 16-Byte I/O, Block, Table 26., EPM 16-Byte I/O Block Definition
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Preliminary Information AMD-K6™-2E+ Embedded Processor Data Sheet 23542A/0-September 2000 EPM 16-Byte I/O Block 15 The EPM 16-byte I/O block contains one 4-byte field-Bus Divisor and Voltage ID Control (BVC)-for enabling, controlling, and monitoring the enhanced power management features (see Figure 55). Table 26 defines the function of the BVC field within the EPM 16-byte I/O block mapped by the EPMR. 12 11 87 0 BVC Reserved Symbol Description BVC Bus Divisor and Voltage ID Control Bytes 11-8 Figure 55. EPM 16-Byte I/O Block Table 26. EPM 16-Byte I/O Block Definition Byte Description R/W Function1 15-12 Reserved R All reserved bits are always read as 0. 11-8 Bus Divisor and Voltage ID Control (BVC) R/W The bit fields within the BVC bytes allow software to change the processor bus divisor and core voltage. 7-0 Reserved R All reserved bits are always read as 0. Notes: 1. All bits default to 0 when RESET is asserted. BVC. Figure 56 on page 147 shows the format, and Table 27 on page 147 defines the function of each bit of the BVC field located within the EPM 16-byte I/O block. 146 AMD PowerNow!™ Technology Chapter 6