參數(shù)資料
型號(hào)： 80546KF
廠商： Intel Corp.
英文描述： 64-bit Intel Xeon Processor MP with up to 8MB L3 Cache
中文描述： 64位Intel Xeon處理器MP的高達(dá)8MB三級(jí)高速緩存
文件頁數(shù)： 37/138頁
文件大小： 2666K
代理商： 80546KF
64-bit Intel
Xeon Processor MP with up to 8MB L3 Cache Datasheet
37
Electrical Specifications
2.11
AGTL+ Front Side Bus Specifications
Termination resistors are not required for most AGTL+ signals because they are integrated into the
processor silicon.
Valid high and low levels are determined by the input buffers which compare a signal’s voltage
with a reference voltage called GTLREF.
Table 2-19
lists the GTLREF specifications. GTLREF should be generated on the system board
using high-precision voltage divider circuits.
NOTES:
1. The tolerances for this specification have been stated generically to enable system designers to calculate the
minimum values across the range of V
.
2. GTLREF is generated from V
on the baseboard by a voltage divider of 1% resistors.
3. R
TT
is the on-die termination resistance measured at V
of the AGTL+ output driver.
4. R
is the on-die termination resistance for improved noise margin and signal integrity.
5. The COMP0 resistor is provided by the baseboard with 1% resistors.
6. The V
referred to in these specifications refers to instantaneous V
.
7. The SLEW_CTRL resistor is provided by the baseboard with 1% resistors.
2.12
Front Side Bus AC Specifications
The processor front side bus timings specified in this section are defined at the processor core
silicon and are thus not measurable at the processor pins
.
See
Section 6
for processor pin signal definitions.
Table 2-20
through
Table 2-27
list the AC specifications associated with the processor front side
bus.
All AGTL+ timings are referenced to GTLREF for both ‘0’ and ‘1’ logic levels unless otherwise
specified.
Table 2-19. AGTL+ Bus Voltage Definitions
Symbol
Parameter
Min
Typ
Max
Units
Notes
GTLREF
Bus Reference
Voltage
Termination
Resistance
(pull-up)
Termination
Resistance
(pull-down)
COMP Resistance
SLEW_CTRL
Resistance
0.98 * (0.63 * V
TT
)
0.63 * V
TT
1.02 * (0.63 * V
TT
)
V
1,2,6
R
TT
40.5
45
49.5
3
R
L
360
450
540
4
COMP0
49.4
49.9
50.4
5
SLEW_CTRL
49.4
49.9
50.4
7
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