Signal Description
2.13.2
Output Control
The output interface is responsible for driving six bits per slot. These signals are mapped onto
Intel® 6702PXH 64-bit PCI Hub pins as shown in Table 2-25 and Table 2-26 for serial mode and
Table 2-27 for parallel mode.
• POWER ENABLE: Connected to an analog component designed to regulate current and
voltage of the PCI slot, and generates a (power) fault signal when an abnormal condition is
detected.
• CLOCK ENABLE#: Connects the PCI clock signals of the PCI slot to the PCI bus via FET
isolation switches.
• BUS ENABLE#: Connects the PCI bus signals of the PCI slot to the system bus PCI bus via
FET isolation switches.
• RESET#: Connected to the RST# pin of the PCI slot.
• ATNLED#: Connected to the optional attention LED, which is yellow or amber in color.
• PWRLED#: Connected to the power LED, which is green in color.
2.13.3
Input Control
The input interface captures eight inputs from each slot. These signals are mapped onto
Intel® 6702PXH 64-bit PCI Hub pins as shown in Table 2-25 and Table 2-26 for serial mode and
Table 2-27 for parallel mode.
• FAULT#: Over-current / Under-volt indication: When asserted, the Intel® 6702PXH 64-bit
PCI Hub, if enabled, immediately asserts reset and disconnects the PCI slot from the bus.
• PRSNT1# and PRSNT2#: Signals which determine whether or not a card is installed to
budget system power. These inputs are connected to the PRSNT1# and PRSNT2# pins on the
PCI card.
• M66EN: Determines if a card is capable of running at 66 MHz in conventional PCI mode.
PRSNT1#
PRSNT2#
Meaning
1
0
1
0
1
1
0
0
No expansion card present
Expansion card present; 25 W maximum
Expansion card present; 15 W maximum
Expansion card present; 7.5 W maximum
• PCIXCAP1 and PCIXCAP2: Determines if a PCI slot is PCI-X capable, and if so, at which
bus frequency it can operate.
PCIXCAP1
PCIXCAP2
Meaning
1
0
1
0
1
1
0
0
100/133 MHz PCI-X Mode
66 MHz PCI-X Mode
Reserved
PCI Mode
46
Intel® 6702PXH 64-bit PCI Hub Datasheet
INTEL [ INTEL ]
