14
Intel
a
Pentium
a
II Processor With On-die Cache Mobile Module MMC-1
3.1.7
Voltages (39 Signals)
Table 7 lists the voltage signal definitions.
Table 7. Voltage Descriptions
Name
Type
Number
of Pins
Description
V_DC
I
10
DC Input:
5V-21V.
V_3S
I
20
SUSB# controlled 3.3V:
V_3S is supplied by the system electronics. This is a 3.3V power
supply that is turned off during suspend during system states STR, STD, and Soff.
V_5
I
1
SUSC# controlled 5V:
Power managed 5.0-V supply.
An output of the voltage regulator on
the system electronics. This rail is off during STD and Soff.
V_3
I
5
SUSC# controlled 3.3V:
Power managed 3.3-V supply.
An output of the voltage regulator on
the system electronics. This rail is off during STD and Soff.
V_CPUIO
O
3
Processor I/O Ring:
Powers the processor interface signals such as the PIIX4E/M open-drain
pullups for the processor/PIIX4E/M sideband signals and the CKDM66-M clock source.
3.1.8
JTAG (7 Signals)
Table 8 lists the JTAG signals, which the system electronics
can use to implement a JTAG chain and ITP port, if desired.
The JTAG signals provided cannot be used as an ITP port,
since the definition of the ITP interface has changed
between the generations of the mobile Pentium processor
and the mobile Pentium II processor with on-die cache.
Table 8. JTAG Pins
Name
Type
Voltage
Description
TDO
O
V_CPUIO
JTAG Test Data Out:
Serial output port. TAP instructions and data is shifted out of the
processor from this port.
TDI
I
V_CPUIO
JTAG Test Data In:
Serial input port. TAP instructions and data is shifted into the
processor from this port.
TMS
I
V_CPUIO
JTAG Test Mode Select:
Controls the TAP controller change sequence.
TCLK
I
V_CPUIO
JTAG Test Clock:
Testability clock for clocking the JTAG boundary scan sequence.
TRST#
I
V_CPUIO
JTAG Test Reset:
Asynchronously resets the TAP controller in the processor.
ITP(1:0)
ITP1
ITP0
O
I
V_CPUIO
Debug Port Signals:
These signals are not used on the module and should not be
connected.
NOTE:
DBREST# (reset target system) on the ITP debug port can be “l(fā)ogically ANDed” with VR_PWRGD TO PIIX4E/M’s PWROK.