Intel BX80569QX6850 Datasheet download pdf (Page 31)

Datasheet 31

Electrical Specifications

2.7.4 Clock Specifications

2.7.5 Front Side Bus 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’s core frequency is a

multiple of the BCLK[1:0] frequency. The processor bus ratio multiplier will be set at its

default ratio during manufacturing. Refer to Table 16 for the processor supported

ratios.

The processor uses a differential clocking implementation. For more information on the

processor clocking, contact your Intel Field representative. Platforms using a CK505

Clock Synthesizer/Driver should comply with the specifications in Section 2.7.8.

Platforms using a CK410 Clock Synthesizer/Driver should comply with the specifications

in Section 2.7.9.

2.7.6 FSB Frequency Select Signals (BSEL[2:0])

The BSEL[2:0] signals are used to select the frequency of the processor input clock

(BCLK[1:0]). Table 17 defines the possible combinations of the signals and the

frequency associated with each combination. The required frequency is determined by

the processor, chipset, and clock synthesizer. All agents must operate at the same

frequency.

The Intel Core2 Duo desktop processors E6850, E6750, E6550, and E6540 operate at

1333 MHz (selected by the 333 MHz BCLK[2:0] frequency). The Intel Core2 Duo

desktop processors E6700, E6600, E6420, E6400, E6320, and E6300 operate at

1066 MHz (selected by the 266 MHz BCLK[2:0] frequency). The Intel Core2 Extreme

processor X6800 operates at a 1066 MHz FSB frequency (selected by a 266 MHz

BCLK[1:0] frequency). The Intel Core2 Duo desktop processors E4600, E4500, E4400

and E4300 operate at a 800 MHz FSB frequency (selected by a 200 MHz BCLK[1:0]

frequency).

Table 16. Core Frequency to FSB Multiplier Configuration

Multiplication of

System Core

Frequency to FSB

Frequency

Core Frequency

(200 MHz BCLK/

800 MHz FSB)

Core Frequency

(266 MHz BCLK/

1066 MHz FSB)

Core Frequency

(333 MHz BCLK/

1333 MHz FSB)

Notes

1, 2

NOTES:

1. Individual processors operate only at or below the rated frequency.

2. Listed frequencies are not necessarily committed production frequencies.

1/6 1.20 GHz 1.60 GHz 2.00 GHz -

1/7 1.40 GHz 1.87 GHz 2.33 GHz -

1/8 1.60 GHz 2.13 GHz 2.66 GHz -

1/9 1.80 GHz 2.40 GHz 3.00 GHz -

1/10 2 GHz 2.66 GHz 3.33 GHz -

1/11 2.2 GHz 2.93 GHz 3.66 GHz -

1/12 2.4 GHz 3.20 GHz 4.00 GHz

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Intel BX80569QX6850 Datasheet Page 31

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