Gtl+ Front Side Bus Specifications; Gtl+ Bus Voltage Definitions - Intel E8200 - Cpu Core 2 Duo 2.66Ghz Fsb1333Mhz 6M Lga775 Tray Datasheet

2.7.3.2

GTL+ Front Side Bus Specifications

In most cases, termination resistors are not required as these are integrated into the
processor silicon. See
termination.
Valid high and low levels are determined by the input buffers by comparing with a
reference voltage called GTLREF.
reference voltage (GTLREF) should be generated on the system board using high
precision voltage divider circuits.
Table 15.

GTL+ Bus Voltage Definitions

Symbol
GTLREF_PU
GTLREF_PD
R
TT
COMP[3:0]
COMP8
NOTES:
1. Unless otherwise noted, all specifications in this table apply to all processor frequencies.
2. GTLREF is to be generated from V
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
4. COMP resistance must be provided on the system board with 1% resistors. COMP[3:0] and
COMP8 resistors are to V
30
Table 9 for details on which GTL+ signals do not include on-die
Parameter
GTLREF pull up on Intel
3 Series Chipset family
boards
GTLREF pull down on
Intel 3 Series Chipset
family boards
Termination Resistance
COMP Resistance
COMP Resistance
is the on-die termination resistance measured at V
.
SS
Table 15 lists the GTLREF specifications. The GTL+
Min Typ
57.6 * 0.99 57.6
100 * 0.99 100
45 50
49.40 49.90
24.65 24.90
by a voltage divider of 1% resistors. If an Adjustable
TT
TT
Electrical Specifications
Max Units Notes
57.6 * 1.01 Ω 2
100 * 1.01 Ω 2
55 Ω 3
50.40 Ω 4
25.15 Ω 4
/3 of the GTL+ output driver.
Datasheet
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