Intel 80331 Design Manual page 25

Table 3. Terminations: Pull-up/Pull-down (Sheet 3 of 4)
Signal
S_RCOMP
SCLKIN
S_REQ[3:0]#
S_PCIXCAP
PRIVMEM
PRIVDEV
P_RCOMP
P_REQ#
P_LOCK#
P_SERR#
P_TRDY#
P_PERR#
P_DEVSEL#
P_FRAME#
P_STOP#
P_IRDY#
P_AD[63:32]
P_C/BE[7:4]
P_PAR64
P_REQ64#
P_ACK64#
Pull-up or Pull-down
Resistor Value (in Ohms)
100 ohm +/- 1% to GND
Through 33.2ohm resistor
to S_CLKOUT
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1.5 K pull-down when
needed (refer to comments)
1.5 K pull-down when
needed (refer to comments)
100 ohm +/- 1% to GND
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Intel® 80331 I/O Processor Design Guide
• When PCIODT_EN = 1 no external pull-up needed
• When PCIODT_EN = 0, then 8.2 K pull-up is required.
66 MHz PCI: connect pin to GND.
66 MHz PCI-X: use 0.01 µF to GND || 10 K resistor to GND.
100 MHz PCI-X: use 0.01 µF to GND.
133 MHz PCI-X: use 0.01 µF to GND.
Private Memory Enable: PRIVMEM latched at rising (deasserting)
edge of P_RST# and determines when the 80331 operates with
Private Memory Space on the secondary PCI bus of the PCI-to-PCI
Bridge.
0 = Normal addressing mode. Requires pull-down resistor.
1 = Private Addressing enable in PCI-to-PCI Bridge. (Default mode)
Muxed onto signal A[1],
Private Device Enable: PRIVDEV latched at rising (deasserting)
edge of P_RST# and determines when the 80331 operates with
Private Device enabled on the secondary PCI bus of the PCI-to-PCI
Bridge.
0 = All Secondary PCI devices are accessible to Primary PCI
configuration cycles. (Requires pull-down resistor).
1 = Private Devices enabled in PCI-to-PCI Bridge. (Default mode)
Muxed onto signal A[0]
8.2 K pull-up is required when not already pulled up on the PCI bus.
An add-in card may rely on the motherboard to pull-up this signal.
8.2 K pull-up is required when not already pulled up on the PCI bus.
An add-in card may rely on the motherboard to pull-up this signal.
8.2 K pull-up is required when not already pulled up on the PCI bus.
An add-in card may rely on the motherboard to pull-up this signal.
8.2 K pull-up is required when not already pulled up on the PCI bus.
An add-in card may rely on the motherboard to pull-up this signal.
8.2 K pull-up is required when not already pulled up on the PCI bus.
An add-in card may rely on the motherboard to pull-up this signal.
8.2 K pull-up is required when not already pulled up on the PCI bus.
An add-in card may rely on the motherboard to pull-up this signal.
8.2 K pull-up is required when not already pulled up on the PCI bus.
An add-in card may rely on the motherboard to pull-up this signal.
8.2 K pull-up is required when not already pulled up on the PCI bus.
An add-in card may rely on the motherboard to pull-up this signal.
8.2 K pull-up is required when not already pulled up on the PCI bus.
An add-in card may rely on the motherboard to pull-up this signal.
8.2 K pull-up is required when not already pulled up on the PCI bus.
An add-in card may rely on the motherboard to pull-up this signal.
8.2 K pull-up is required when not already pulled up on the PCI bus.
An add-in card may rely on the motherboard to pull-up this signal.
8.2 K pull-up is required when not already pulled up on the PCI bus.
An add-in card may rely on the motherboard to pull-up this signal.
8.2 K pull-up is required when not already pulled up on the PCI bus.
An add-in card may rely on the motherboard to pull-up this signal.
8.2 K pull-up is required when not already pulled up on the PCI bus.
An add-in card may rely on the motherboard to pull-up this signal.
Terminations
Comments
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