Intel 440GX ユーザーズマニュアル
Intel
®
440GX AGPset Design Guide
4-4
Debug Recommendations
Inputs to the Slot 1 connector, from system logic (assuming a 14mA driver):
•
PWRGOOD
150 - 330 ohm
•
INIT#
150 - 330 ohm
•
LINT[0]/INTR
150 - 330 ohm
•
LINT[1]/NMI
150 - 330 ohm
•
IGNNE#
150 - 330 ohm
•
A20M#
150 - 330 ohm
Bi-directional signal to/from the Slot 1 connector:
•
PICD[0]#
150 ohm
•
PICD[1]#
150 ohm
Inputs to the Slot 1 connector, only pull-up:
•
FLUSH# 510
ohm
4.3.2
Debug Logic Recommendations
Debug Recommendations are intended to assist in the development of the Intel
®
Pentium
®
II
processor system and products utilizing it. The following are strongly recommended for early
prototype designs only.
prototype designs only.
•
Provide a push button reset circuit, do not rely on power-on reset from the power supply. A
push-button reset usually results in more repeatable results when debugging initialization
problems.
push-button reset usually results in more repeatable results when debugging initialization
problems.
•
Include a Intel
®
Pentium
®
II processor debug port connector. Intel cannot provide debug
assistance without this connection. See the Integration tools chapter of the processor
datasheet for schematics and a signal checklist. Be sure it is the proper 0.050” x .100”
(1.27mm x 4mm) spacing connector.
datasheet for schematics and a signal checklist. Be sure it is the proper 0.050” x .100”
(1.27mm x 4mm) spacing connector.
•
Provide the capability to measure the processor’s case temperature (Tplate) to ensure that the
maximum temperature specification per processor Intel
maximum temperature specification per processor Intel
®
Pentium
®
II Processor Datasheet.
•
Place an SMA style (or similar) coaxial connector on the power plane between the VRM
Header or on board voltage regulator and Slot 1 connector so that power plane noise can be
monitored on systems. Note: an SMA to BNC cable for an oscilloscope may be needed as
well. This component would only be placed during design evaluation.
Header or on board voltage regulator and Slot 1 connector so that power plane noise can be
monitored on systems. Note: an SMA to BNC cable for an oscilloscope may be needed as
well. This component would only be placed during design evaluation.
•
For DP systems, an empty Slot 1 connector is not allowed because one end of the bus
termination would be missing.
termination would be missing.
•
The ITP565 requires a complete boundary scan chain. For a DP system It is recommended
that jumpers be placed on the motherboard to allow the boundary scan chain to bypass an
“empty processor slot”.
that jumpers be placed on the motherboard to allow the boundary scan chain to bypass an
“empty processor slot”.
•
TRST# must be driven low during reset to all components with TRST# pins. Connecting a
pull-down resistor to TRST# will accomplish the reset of the port.
pull-down resistor to TRST# will accomplish the reset of the port.