Electrical Specifications
56
Datasheet, Volume 1
7.1.9
Reserved or Unused Signals
All Reserved (RSVD) signals must not be connected. Connection of these signals to V
CC
,
V
TTA
, V
TTD
, V
CCD,
V
CCPLL
, V
SS
, or to any other signal (including each other) can result in
component malfunction or incompatibility with future processors. See
for a land listing of the processor and the location of all
Reserved signals.
For reliable operation, always connect unused inputs or bi-directional signals to an
appropriate signal level. Unused active high inputs should be connected through a
resistor to ground (V
SS
). Unused outputs maybe left unconnected; however, this may
interfere with some Test Access Port (TAP) functions, complicate debug probing, and
prevent boundary scan testing. A resistor must be used when tying bi-directional
signals to power or ground. When tying any signal to power or ground, a resistor will
also allow for system testability.
7.2
Signal Group Summary
Signals are grouped by buffer type and similar characteristics as listed in
. The
buffer type indicates which signaling technology and specifications apply to the signals.
Table 7-4.
Signal Description Buffer Types
Signal
Description
Analog
Analog reference or output. May be used as a threshold voltage or for buffer
compensation
Asynchronous
1
Notes:
1.
Qualifier for a buffer type.
Signal has no timing relationship with any system reference clock.
CMOS
CMOS buffers: 1.05 V or 1.5 V tolerant
DDR3
DDR3 buffers: 1.5 V tolerant
DMI2
Direct Media Interface Gen 2 signals. These signals are compatible with PCI Express*
2.0 and 1.0 Signaling Environment AC Specifications.
Open Drain CMOS
Open Drain CMOS (ODCMOS) buffers: 1.05 V tolerant
PCI Express*
PCI Express* interface signals. These signals are compatible with PCI Express*
Signalling Environment AC Specifications and are AC coupled. The buffers are not
3.3-V tolerant. Refer to the PCIe specification.
Reference
Voltage reference signal.
SSTL
Source Series Terminated Logic. (JEDEC SSTL_15)
Содержание BX80619I73960X
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