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STPCELITE Datasheet(PDF) 6 Page - STMicroelectronics

Part No. STPCELITE
Description  X86 Core General Purpose PC Compatible System - on - Chip
Download  87 Pages
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STPCELITE Datasheet(HTML) 6 Page - STMicroelectronics

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GENERAL DESCRIPTION
6/87
Release 1.3 - January 29, 2002
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
- 3 power-down timers detecting system inactivity:
- Doze timer (short durations).
- Stand-by timer (medium durations).
- Suspend timer (long durations).
- House-keeping activity detection.
- House-keeping timer to cope with short bursts of
house-keeping activity while dozing or in stand-by
state.
- Peripheral activity detection.
- Peripheral timer detecting peripheral inactivity
- SUSP# modulation
to
adjust
the
system
performance in various power down states of the
system including full power-on state.
- Power control outputs to disable power from
different planes of the board.
Lack of system activity for progressively longer
periods of time is detected by the three power
down timers. These timers can generate SMI
interrupts to CPU so that the SMM software can
put the system in decreasing states of power
consumption. Alternatively, system activity in a
power down state can generate an SMI interrupt
to allow the software to bring the system back up
to full power-on state. The chip-set supports up to
three power down states described above; these
correspond to decreasing levels of power savings.
Power down puts the STPC Elite into suspend
mode. The processor completes execution of the
current
instruction,
any
pending
decoded
instructions and associated bus cycles. During the
suspend mode, internal clocks are stopped.
Removing power-down, the processor resumes
instruction fetching and begins execution in the
instruction stream at the point it had stopped.
Because of the static nature of the core, no
internal data is lost.
1.3. JTAG
JTAG stands for Joint Test Action Group and is the
popular name for IEEE Std. 1149.1, Standard Test
Access Port and Boundary-Scan Architec-ture.
This built-in circuitry is used to assist in the test,
maintenance and support of functional circuit
blocks. The circuitry includes a standard interface
through which instructions and test data are
communicated. A set of test features is defined,
including a boundary-scan register so that a
component is able to respond to a minimum set of
test instructions.


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