Intel 2 Duo E7200 AT80571PH0613M Data Sheet

30

Datasheet

In most cases, termination resistors are not required as these are integrated into the 

processor silicon. See 

 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. 

 lists the GTLREF specifications. 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 V

TT

 by a voltage divider of 1% resistors. If an Adjustable 

GTLREF circuit is used on the board (for Quad-Core processors compatibility), the two 
GTLREF lands connected to the Adjustable GTLREF circuit require the following: 
GTLREF_PU = 50 Ω, GTLREF_PD = 100 Ω. 

3.

R

TT

 is the on-die termination resistance measured at V

TT

/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 V

SS

.

GTLREF_PU

GTLREF_PD

GTLREF pull up on Intel 
3 Series Chipset family 
boards

57.6 * 0.99

57.6

57.6 * 1.01

Ω

2

GTLREF pull down on 
Intel 3 Series Chipset 
family boards

100 * 0.99

100

100 * 1.01

Ω

2

R

TT

Termination Resistance

45

50

55

Ω

3

COMP[3:0]

COMP Resistance

49.40

49.90

50.40

Ω

4

COMP8

COMP Resistance

24.65

24.90

25.15

Ω

4