Intel 830 Vttpwrgd DC Specifications, Bootselect and MSID10 DC Specifications, Input High Voltage

Electrical Specifications

Table 2-14. VTTPWRGD DC Specifications

Symbol	Parameter	Min	Typ	Max	Unit	Notes
VIL	Input Low Voltage	—	—	0.3	V
VIH	Input High Voltage	0.9	—	—	V

Table 2-15. BOOTSELECT and MSID[1:0] DC Specifications

Symbol	Parameter	Min	Typ	Max	Unit	Notes
VIL	Input Low Voltage	—	—	0.24	V	1
VIH	Input High Voltage	0.96	—	—	V	-

NOTES:

1. These parameters are not tested and are based on design simulations.

2.6.3.1GTL+ Front Side Bus Specifications

In most cases, termination resistors are not required as these are integrated into the processor silicon. See Table 2-8for 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 2-16lists the GTLREF specifications. The GTL+ reference voltage (GTLREF) must be generated on the motherboard using high precision voltage divider circuits.

Table 2-16. 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	2
GTLREF_PD	GTLREF pull down resistor		210 * 0.99	210	210 * 1.01	Ω	2
RPULLUP	On die pullup for		500	-	5000	Ω	3
	BOOTSELECT signal
	60	Ω Platform Termination	41	50	58	Ω	4
	Resistance
RTT
	50	Ω Platform Termination	37	45	52	Ω	4
	Resistance
	60	Ω Platform COMP	59.8	60.4	61	Ω	5
	Resistance
COMP[1:0]
	50	Ω Platform COMP	49.9 * 0.99	49.9	49.9 * 1.01	Ω	5
	Resistance
	60	Ω Platform COMP	59.8	60.4	61	Ω	5
	Resistance
COMP[3:2]
	50	Ω Platform COMP	49.9 * 0.99	49.9	49.9 * 1.01	Ω	5
	Resistance
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 GTLREF land).

3.These pull-ups are to VTT.

4.RTT is the on-die termination resistance measured at VTT/2 of the GTL+ output driver. The IMPSEL pin is used to select a 50Ω or 60Ω buffer and RTT value.

5.COMP resistance must be provided on the system board with 1% resistors. COMP[1:0] resistors are to VSS. COMP[3:2] resistors are to VSS.

Datasheet 31