STPCCONSUMER-II datasheet(7/93 Pages) STMICROELECTRONICS

7 / 93 page

GENERAL DESCRIPTION

Release 1.5 - January 29, 2002

7/93

- Peripheral activity detection.

- Peripheral timer for detecting lack of peripheral

activity

- 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

period of times 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 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: Doze state, Stand-by

state and Suspend mode. These correspond to

decreasing levels of power savings.

Power down puts the STPC Consumer-II 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.

1.7. 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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