L2500 datasheet(21/91 Pages) INTEL

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Datasheet

Electrical Specifications

3.1

Power and Ground Pins

For clean, on-chip power distribution, the processor will have a large number of V

(power) and VSS (ground) inputs. All power pins must be connected to VCC power

planes while all VSS pins must be connected to system ground planes. Use of multiple

power and ground planes is recommended to reduce I*R drop. Please contact your

Intel representative for more details. The processor VCC pins must be supplied the

voltage determined by the VID (Voltage ID) pins.

3.2

FSB Clock (BCLK[1:0]) and Processor Clocking

BCLK[1:0] directly controls the FSB interface speed as well as the core frequency of the

processor. As in previous generation processors, the Intel Core Duo processor and Intel

Core Solo processors’ core frequency is a multiple of the BCLK[1:0] frequency. The

processor uses a differential clocking implementation.

3.3

Voltage Identification

The processor uses seven voltage identification pins, VID[6:0], to support automatic

selection of power supply voltages. The VID pins for the processor are CMOS outputs

driven by the processor VID circuitry. Table 2 specifies the voltage level corresponding

to the state of VID[6:0]. A 1 in this refers to a high-voltage level and a 0 refers to low-

voltage level.

Table 2.

Voltage Identification Definition (Sheet 1 of 4)

VID6

VID5

VID4

VID3

VID2

VID1

VID0

VCC (V)

0000

1.5000

0000

1.4875

0000

1.4750

0000

1.4625

0001

1.4500

0001

1.4375

0001

1.4250

0001

1.4125

0010

1.4000

0010

1.3875

0010

1.3750

0010

1.3625

0011

1.3500

0011

1.3375

0011

1.3250

0011

1.3125

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