Intel Pentium III, Руководство по конструкции

Страница: 34 / 68

4-2 Intel
®
Pentium
®
III Processor with 512KB L2 Cache Dual Processor Platform Design Guide
The clocking requirements and timing information for the Intel
®
Pentium
®
III Processor with 512KB L2
Cache can be found in the Intel
®
Pentium
®
III Processor with 512KB L2 Cache Datasheet. For additional
information about the timing and clocking requirements of the chipset component, please contact your
chipset vendor for the appropriate documentation.
4.2 Single Ended Host Bus Clocking Routing
Intel
®
Pentium
®
III Processor with 512KB L2 Cache dual-processor platforms have support for using
single-ended host bus clock drivers. When using this clocking method, the BCLK signal (pin W37) is
used as the single-ended clock input to the processor. The BCLK#/CLKREF signal (pin Y33) is used as a
reference voltage and must be connected to the appropriate filter circuit described in
Section 4.2.1 .
Figure 4-2 shows the topology that should be used for the processor clock traces. Please note that L0,
L1, and L2 refer to trace lengths between the illustrated components. Table 4-1 contains the
recommended lengths and component values for this topology.
Figure 4-1. Host Bus Clock Connections
Processor 0
Chipset
Processor 1
Debug
port
Clock
Driver