Intel QX9775 EU80574XL088N Ficha De Dados
Códigos do produto
EU80574XL088N
Electrical Specifications
32
Datasheet
2.14
AGTL+ FSB Specifications
Routing topologies are dependent on the processors supported and the chipset used in
the design. In most cases, termination resistors are not required as these are
integrated into the processor silicon. See
include on-die termination. Refer to
for R
TT
values.
Valid high and low levels are determined by the input buffers via comparing with a
reference voltage called GTLREF_DATA_MID, GTLREF_DATA_END, GTLREF_ADD_MID,
and GTLREF_ADD_END. GTLREF_DATA_MID and GTLREF_DATA_END is the reference
voltage for the FSB 4X data signals, GTLREF_ADD_MID, and GTLREF_ADD_END is the
reference voltage for the FSB 2X address signals and common clock signals.
lists the GTLREF_DATA_MID, GTLREF_DATA_END, GTLREF_ADD_MID, and
GTLREF_ADD_END specifications.
The AGTL+ reference voltages (GTLREF_DATA_MID, GTLREF_DATA_END,
GTLREF_ADD_MID, and GTLREF_ADD_END) must be generated on the baseboard
using high precision voltage divider circuits.
NOTES:
1.
1.
Unless otherwise noted, all specifications in this table apply to all processor frequencies.
2.
The tolerances for this specification have been stated generically to enable system
designer to calculate the minimum values across the range of V
designer to calculate the minimum values across the range of V
TT
.
3.
GTLREF_DATA_MID, GTLREF_DATA_END, GTLREF_ADD_MID, and GTLREF_ADD_END is
generated from V
generated from V
TT
on the baseboard by a voltage divider of 1% resistors. The minimum
and maximum specifications account for this resistor tolerance. The V
TT
referred to in
these specifications is the instantaneous V
TT
.
4.
R
TT
is the on-die termination resistance measured at V
OL
of the AGTL+ output driver.
Measured at 0.31*V
TT
. R
TT
is connected to V
TT
on die.
5.
COMP resistance must be provided on the system board with 1% resistors.
Table 2-18. AGTL+ Bus Voltage Definitions
Symbol
Parameter
Min
Typ
Max
Units
Notes
1
GTLREF_DATA_MID,
GTLREF_DATA_END
GTLREF_DATA_END
Data Bus Reference
Voltage
Voltage
0.98 * 0.667
* V
TT
0.667 * V
TT
1.02*0.667
* V
TT
V
2, 3
GTLREF_ADD_MID,
GTLREF_ADD_END
GTLREF_ADD_END
Address Bus
Reference Voltage
Reference Voltage
0.98 * 0.667
* V
TT
0.667 * V
TT
1.02*0.667
* V
TT
V
2, 3
R
TT
Termination
Resistance (pull up)
Resistance (pull up)
45
50
55
Ω
4
COMP
COMP Resistance
49.4
49.9
50.4
Ω
5