Pin States
3 Pin States
This chapter describes the states of each Intel® SCH signal in and around reset. It also
documents what signals have internal pull-up/pull-down/series termination resistors
and their values.
3.1
Pin Reset States
Table 4.
Reset State Definitions
Signal State
Description
The Intel® SCH places this output in a high-impedance state. For I/Os,
external drivers are not expected.
High-Z
The state of the input (driven or tri-stated) does not effect the Intel® SCH.
For I/O, it is assumed the output buffer is in a high-impedance state.
Don’t Care
VOH
VOL
The Intel® SCH drives this signal high
The Intel® SCH drives this signal low
The Intel® SCH drives this signal to a level defined by internal function
configuration
VOX–known
VOX–unknown
VIH
The Intel® SCH drives this signal, but to an indeterminate value
The Intel® SCH expects/requires the signal to be driven high.
The Intel® SCH expects/requires the signal to be driven low.
This signal is pulled high by a pull-up resistor (internal or external)
This signal is pulled low by a pull-down resistor (internal or external)
VIL
pull-up
pull-down
The Intel® SCH expects the signal to be driven by an external source, but the
exact electrical level of that input is unknown.
VIX-unknown
Running
Off
The clock is toggling or signal is transitioning because the function has not
stopped.
The power plane for this signal is powered down. The Intel® SCH does not
drive outputs and inputs should not be driven to the Intel® SCH.
Datasheet
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INTEL [ INTEL ]
