Intel Celeron 360 HH80552RE099512 Benutzerhandbuch
Produktcode
HH80552RE099512
Electrical Specifications
28
Datasheet
2.6.3.1
GTL+ Front Side Bus Specifications
In most cases, termination resistors are not required as these are integrated into the
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.
Table 16.
GTL+ Bus Voltage Definitions
Symbol
Parameter
Min
Typ
Max
Units Notes
1
NOTES:
1. Unless otherwise noted, all specifications in this table apply to all processor frequencies.
GTLREF_PU
GTLREF pull up resistor
124 * 0.99
124
124 * 1.01
Ω
2,3
2. GTLREF is to be generated from V
TT
by a voltage divider of 1% resistors (one divider for each GTLREF
land).
3. For Intel 865 Express chipset LGA775 boards only, the GTLREF_PU should be 49.9 Ω 1%, and the GTLREF_PD should
be 100 Ω 1%.
GTLREF_PD
GTLREF pull down resistor
210 * 0.99
210
210 * 1.01
Ω
R
PULLUP
On die pull-up for BOOTSELECT
signal
signal
500
—
5000
Ω
4
4. These pull-ups are to V
TT
.
R
TT
60 Ω Platform Termination
Resistance
Resistance
51
60
66
Ω
5
5. R
TT
is the on-die termination resistance measured at V
TT
/2 of the GTL+ output driver. The IMPSEL land
is used to select a 50 Ω or 60 Ω buffer and R
TT
value.
50 Ω Platform Termination
Resistance
Resistance
39
50
55
Ω
COMP[1:0]
60 Ω Platform Termination
COMP Resistance
COMP Resistance
59.8
60.4
61
Ω
6
6.
COMP resistance must be provided on the system board with 1% resistors. COMP[1:0] resistors are
to V
SS
. COMP[5:4] resistors are to V
TT
.
50 Ω Platform Termination
COMP Resistance
COMP Resistance
49.9 * 0.99
49.9
49.9 * 1.01
Ω
COMP[5:4]
60 Ω Platform Termination
COMP Resistance
COMP Resistance
59.8
60.4
61
Ω
50 Ω Platform Termination
COMP Resistance
COMP Resistance
49.9 * 0.99
49.9
49.9 * 1.01
Ω