Intel 500 - DATASHEET REV 003 Datasheet page 59

Package Mechanical Specifications and Pin Information
Table 15. Signal Description (Sheet 7 of 8)
Name
SLP#
SMI#
STPCLK#
TCK
TDI
TDO
TEST1,
TEST2,
TEST3,
TEST4
THERMDA
THERMDC
THERMTRIP#
TMS
Datasheet
Type
SLP# (Sleep), when asserted in Stop-Grant state, causes the
processor to enter the Sleep state. During Sleep state, the processor
stops providing internal clock signals to all units, leaving only the
Phase-Locked Loop (PLL) still operating. Processors in this state do
not recognize snoops or interrupts. The processor recognizes only
Input assertion of the RESET# signal, deassertion of SLP#, and removal of
the BCLK input while in Sleep state. If SLP# is deasserted, the
processor exits Sleep state and returns to Stop-Grant state,
restarting its internal clock signals to the bus and processor core
units. If DPSLP# is asserted while in the Sleep state, the processor
exits the Sleep state and transition to the Deep Sleep state.
SMI# (System Management Interrupt) is asserted asynchronously by
system logic. On accepting a System Management Interrupt, the
processor saves the current state and enter System Management
Mode (SMM). An SMI Acknowledge transaction is issued, and the
Input
processor begins program execution from the SMM handler.
If SMI# is asserted during the deassertion of RESET# the processor
tristates its outputs.
STPCLK# (Stop Clock), when asserted, causes the processor to enter
a low-power Stop-Grant state. The processor issues a Stop-Grant
Acknowledge transaction, and stops providing internal clock signals
to all processor core units except the FSB and APIC units. The
Input processor continues to snoop bus transactions and service interrupts
while in Stop-Grant state. When STPCLK# is deasserted, the
processor restarts its internal clock to all units and resumes
execution. The assertion of STPCLK# has no effect on the bus clock;
STPCLK# is an asynchronous input.
TCK (Test Clock) provides the clock input for the processor Test Bus
(also known as the Test Access Port).
Input
Please refer to the platform design guide for termination
requirements and implementation details.
TDI (Test Data In) transfers serial test data into the processor. TDI
Input
provides the serial input needed for JTAG specification support.
TDO (Test Data Out) transfers serial test data out of the processor.
Output
TDO provides the serial output needed for JTAG specification support.
TEST1 and TEST2 must have a stuffing option of separate pull-down
resistors to V .
SS
For testing purposes it is recommended, but not required, to route
Input
the TEST3 and TEST4 pins through a ground referenced 55-Ω trace
that ends in a via that is near a GND via and is accessible through an
oscilloscope connection.
Other Thermal Diode Anode.
Other Thermal Diode Cathode.
The processor protects itself from catastrophic overheating by use of
an internal thermal sensor. This sensor is set well above the normal
operating temperature to ensure that there are no false trips. The
Output
processor stops all execution when the junction temperature exceeds
approximately 125°C. This is signalled to the system by the
THERMTRIP# (Thermal Trip) pin.
TMS (Test Mode Select) is a JTAG specification support signal used by
Input
debug tools.
Description
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