Electrical Specifications; Power And Ground Pins; Fsb Clock (Bclk[1:0]) And Processor Clocking; Voltage Identification - Intel LF80537GF0484M - Cpu Core 2 Duo T7400 2.16Ghz Fsb667Mhz 4Mb Fcpga6 Tray Datasheet

Electrical Specifications

3 Electrical Specifications
3.1

Power and Ground Pins

For clean, on-chip power distribution, the processor has a large number of V
and V (ground) inputs. All power pins must be connected to V
SS
all V pins must be connected to system ground planes. Use of multiple power and
SS
ground planes is recommended to reduce I*R drop. The processor V
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 processor 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 processor are CMOS outputs
driven by the processor VID circuitry.
to the state of VID[6:0]. A 1 refers to a high-voltage level and a 0 refers to low-voltage
level.
Table 2. Voltage Identification Definition (Sheet 1 of 4)
VID6
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Datasheet
VID5 VID4 VID3
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 0
0 0 1
0 0 1
0 0 1
0 0 1
0 0 1
0 0 1
0 0 1
0 0 1
0 1 0
0 1 0
0 1 0
0 1 0
0 1 0
0 1 0
Table 2 specifies the voltage level corresponding
VID2 VID1 VID0
0 0
0 0
0 1
0 1
1 0
1 0
1 1
1 1
0 0
0 0
0 1
0 1
1 0
1 0
1 1
1 1
0 0
0 0
0 1
0 1
1 0
1 0
(power)
CC
power planes while
CC
pins must be
CC
V (V)
CC
0 1.5000
1 1.4875
0 1.4750
1 1.4625
0 1.4500
1 1.4375
0 1.4250
1 1.4125
0 1.4000
1 1.3875
0 1.3750
1 1.3625
0 1.3500
1 1.3375
0 1.3250
1 1.3125
0 1.3000
1 1.2875
0 1.2750
1 1.2625
0 1.2500
1 1.2375
23