Intel 31154 manual Pull-Up/Pull-Down Terminations Sheet 7, Voltages, Miscellaneous

				Terminations
Table 5.	Pull-Up/Pull-Down Terminations (Sheet 7 of 9)
Signal		Pull-Up/Pull-Down or Termination (See Note 1)		Comments
JTAG
TCK		Pull low when not used.
TDI		When not used, pull up to 3.3 V through an
		external 8.2 KΩ resistor.
TDO		NC when not used
TRST#		When not used, pull low to GND through an
		external 1 KΩ resistor.
TMS		When not used, pull up to 3.3 V through an
		external 8.2 KΩ resistor.
SCAN_EN		For normal operation, tie low to GND.
		For normal operation, tie to 0000 or 0111.
TMODE[3:0]		0 = Pull low to GND.
		1 = Pull high to 3.3 V through an external 8.2 KΩ
		resistor.
Voltages
		Connect to 1.3 V supply through a low-pass filter to	•	Ensure that the voltage at the input pin is
		reduce noise-induced jitter. The 4.7 ∝F capacitor		within the min./max. range for S_VCCA
S_VCCA		must be low ESR solid tantalum, the 0.01 ∝F		(1.235 V and 1.365 V).
		capacitor must be of type X7R, and the node	•	For power sequencing, see Section 8.2,
		connecting VCCPLL must be as short as possible.		“Power Sequencing” on page 58.
		Connect to 1.3 V supply through a low-pass filter to	•	Ensure that the voltage at the input pin is
		reduce noise-induced jitter. The 4.7 ∝F capacitor		within the min./max. range for P_VCCA
P_VCCA		must be low ESR solid tantalum, the 0.01 ∝F		(1.235 V and 1.365 V).
		capacitor must be of type X7R, and the node	•	For power sequencing, see Section 8.2,
		connecting VCCPLL must be as short as possible.		“Power Sequencing” on page 58.
VCC		Connect to 1.3 V supply.
VCCP		Connect to 3.3 V supply.
		Connect to 5 V or 3.3 V power supply through an
PVIO		external resistor, depending on the signaling level
		of primary PCI bus (see Note 4).
		Connect to 5 V or 3.3 V power supply through an
SVIO		external resistor, depending on the signaling level
		of secondary PCI bus (see Note 4).
Miscellaneous
R_REF		Pull down to GND through an external 30 Ω 1%
		resistor.
MT0# and MT1#		Pull up to 3.3 V through an external 8.2 KΩ series
		resistor.

NOTES:

1.The recommended value for pull-up resistors for PCI applications is 5.6 KΩ (note that the minimum value for PCI 3.3 V signaling RMIN = 2.42 KΩ, RTYP = 8.2 KΩ, as per the PCI Local Bus Specification, Revision 2.3, section 4.3.3).

2.The recommended value for pull-up resistors for PCI-X applications is 8.2 KΩ. For PCI-X, the minimum pull-up resistor value is 5 KΩ, as per the PCI-X Addendum to the PCI Local Bus Specification, Revision 1.0b, section 9.7.

3.For plug-in card implementations, the pull-up must be on the motherboard.

4.Connect PVIO and SVIO pull-up resistors to 5 V or 3.3 V power supply through an external resistor—25 Ω (5 V) or

0 Ω (3.3 V), depending on the signaling level of the primary/secondary PCI bus. Refer to the power-sequencing guidelines in Section 8.2 on page 58.

Intel® 31154 133 MHz PCI Bridge Design Guide Design Guide 25