参数资料
型号: BX80532KE2000D
厂商: INTEL CORP
元件分类: 微控制器/微处理器
英文描述: 32-BIT, 2000 MHz, MICROPROCESSOR, XMA
文件页数: 13/102页
文件大小: 1464K
代理商: BX80532KE2000D
18
Intel Xeon Processor with 533 MHz Front Side Bus at 2 GHz to 3.20 GHz
2.7
Reserved Or Unused Pins
All Reserved pins must remain unconnected on the system baseboard. Connection of these pins to
VCC, VSS, or to any other signal (including one another) can result in component malfunction or
incompatibility with future processors. See Chapter 5.0 for a pin listing of the processor and for the
location of all Reserved pins.
For reliable operation, unused inputs or bidirectional signals should always be connected to an
appropriate signal level. In a system-level design, on-die termination has been included on the
processor to allow signal termination to be accomplished by the processor silicon. Most unused
AGTL+ inputs should be left as no connects, as AGTL+ termination is provided on the processor
silicon. However, see Table 4 for details on AGTL+ signals that do not include on-die termination.
Unused active high inputs should be connected through a resistor to ground (VSS). Unused outputs
can be left unconnected, however this may interfere with some TAP functions, complicate debug
probing, and prevent boundary scan testing. A resistor must be used when tying bidirectional
signals to power or ground. When tying any signal to power or ground, a resistor will also allow for
system testability. For unused AGTL+ input or I/O signals, use pull-up resistors of the same value
for the on-die termination resistors (RTT). See Table 12.
TAP, Asynchronous GTL+ inputs, and Asynchronous GTL+ outputs do not include on-die
termination. Inputs and all used outputs must be terminated on the baseboard. Unused outputs may
be terminated on the baseboard or left unconnected. Note that leaving unused outputs unterminated
may interfere with some TAP functions, complicate debug probing, and prevent boundary scan
testing. Signal termination for these signal types is discussed in the ITP700 Debug Port Design
Guide.
All TESTHI[6:0] pins should be individually connected to VCC via a pull-up resistor which
matches the trace impedance within
±10 . TESTHI[3:0] and TESTHI[6:5] may all be tied
together and pulled up to VCC with a single resistor if desired. However, utilization of boundary
scan test will not be functional if these pins are connected together. TESTHI4 must always be
pulled up independently from the other TESTHI pins. For optimum noise margin, all pull-up
resistor values used for TESTHI[6:0] pins should have a resistance value within 20 percent of the
impedance of the baseboard transmission line traces. For example, if the trace impedance is 50
,
then a pull-up resistor value between 40 and 60
should be used. The TESTHI[6:0] termination
recommendations provided in the Intel XeonTM Processor Datasheet are also suitable for the
Intel Xeon processor with 533 MHz Front Side Bus. However, Intel recommends new designs
or designs undergoing design updates follow the trace impedance matching termination guidelines
outlined in this section.
2.8
Front Side Bus Signal Groups
In order to simplify the following discussion, the front side bus signals have been combined into
groups by buffer type. AGTL+ input signals have differential input buffers, which use GTLREF as
a reference level. In this document, the term “AGTL+ Input” refers to the AGTL+ input group as
well as the AGTL+ I/O group when receiving. Similarly, “AGTL+ Output” refers to the AGTL+
output group as well as the AGTL+ I/O group when driving.
With the implementation of a source synchronous data bus comes the need to specify two sets of
timing parameters. One set is for common clock signals whose timings are specified with respect to
rising edge of BCLK0 (ADS#, HIT#, HITM#, etc.) and the second set is for the source
synchronous signals which are relative to their respective strobe lines (data and address) as well as
相关PDF资料
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BX80532KC1900E 1900 MHz, MICROPROCESSOR
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