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Datasheet 27

Electrical Specifications

Table 14. GTL+ Bus Voltage Definitions

Symbol Parameter Min Typ Max Units Notes

NOTES:

1. Unless otherwise noted, all specifications in this table apply to all processor frequencies.

GTLREF_PU

GTLREF pull up resistor on

975X and 96x Express

Chipset family boards

124 * 0.99 124 124 * 1.01 Ω

2. GTLREF is to be generated from V

by a voltage divider of 1% resistors (one divider for each

GTLEREF land).

GTLREF_PD

GTLREF pull down resistor

on 975X and 96x Express

Chipset family boards

210 * 0.99 210 210 * 1.01 Ω

GTLREF_PU

GTLREF pull up resistor on

Intel Series 3 Express

Chipset family boards

100 * 0.99 100 100 * 1.01 Ω

GTLREF_PD

GTLREF pull down resistor

on Intel Series 3 Express

Chipset chipset family

boards

200 * 0.99 200 200 * 1.01 Ω

Termination Resistance 45 50 55 Ω

3. R

is the on-die termination resistance measured at V

/3 of the GTL+ output driver.

COMP[3:0] COMP Resistance 49.40 49.90 50.40 Ω

4. COMP resistance must be provided on the system board with 1% resistors. COMP[3:0] and

COMP8 resistors are to V

COMP8 COMP Resistance 24.65 24.90 25.15 Ω

1 2 ... 22 23 24 25 26 27 28 29 30 31 32 ... 101 102

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Intel BX80557E1400 Scheda Tecnica Pagina 27