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430 数据表(PDF) 27 Page - Intel Corporation |
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430 数据表(HTML) 27 Page - Intel Corporation |
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27 / 100 page  Datasheet 27 Electrical Specifications 2.7.3.1 GTL+ Front Side Bus Specifications In most cases, termination resistors are not required as these are integrated into the processor silicon. See Table 9 for details on which GTL+ signals do not include on-die termination. Valid high and low levels are determined by the input buffers by comparing with a reference voltage called GTLREF. Table 14 lists the GTLREF specifications for both 50 Ohm and 60 Ohm platforms. The GTL+ reference voltage (GTLREF) should be generated on the system board using high precision voltage divider circuits. NOTES: 1. Unless otherwise noted, all specifications in this table apply to all processor frequencies. 2. GTLREF is to be generated from VTT by a voltage divider of 1% resistors (one divider for each GTLEREF land). 3. RTT is the on-die termination resistance measured at VTT/3 of the GTL+ output driver. 4. COMP resistance must be provided on the system board with 1% resistors. COMP[3:0] and COMP8 resistors are to VSS. Table 14. GTL+ Bus Voltage Definitions Symbol Parameter Min Typ Max Units Notes1 GTLREF_PU GTLREF pull up resistor 124 * 0.99 124 124 * 1.01 Ω GTLREF_PD GTLREF pull down resistor 210 * 0.99 210 210 * 1.01 Ω 2, 4 R TT Termination Resistance 45 50 55 Ω 3 COMP[3:0] 60 Ω Platform termination Resistance 60.4 * 0.99 60.4 60.4 * 1.01 Ω 4 50 Ω Platform termination Resistance 49.9 * 0.99 49.9 49.9 * 1.01 Ω 4 COMP8 60 Ω Platform termination Resistance 30.1 * 0.99 30.1 30.1 * 1.01 Ω 4 50 Ω Platform termination Resistance 24.9 * 0.99 24.9 24.9 * 1.01 Ω 4 |
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