Intel E6420 Data Sheet - Page 31
Clock Specifications, Front Side Bus Clock BCLK[1:0] and Processor Clocking, FSB Frequency Select - driver
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Electrical Specifications 2.7.4 Clock Specifications 2.7.5 Table 16. 2.7.6 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. 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/ Notes1, 2 1333 MHz FSB) 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 NOTES: 1. Individual processors operate only at or below the rated frequency. 2. Listed frequencies are not necessarily committed production frequencies. 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). Datasheet 31