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Intel® Server Board Set SE8500HW4 I/O Subsystems
Revision 1.0
Intel order number D22893-001
13
3.1.3 Bus Arbitration Signals
Request (REQ#) signals indicate to the bus arbiter that an agent/device desires use of the bus.
The Grant (GNT#) signal indicates to the agent/device that access to the bus has been granted.
Every master has its own REQ#, which must be tri-stated while RST# is asserted. These are
point-to-point signals which are assigned to every bus master.
In the Intel
®
Server Board Set SE8500HW4 there is one arbiter for each PCI bus on the PXH
and Intel
®
IOP332 Storage I/O Processor. The PXH contains an arbiter for slot 2 and the
BCM5704 and the Intel
®
IOP332 Storage I/O Processor contains an arbiter for slots 6 and 7, LSI
Logic 53C1030, and the Intel
®
Fibre Channel Module.
Table 6. Arbitration Connections
Device REQ# GNT# Host Bridge
Broadcom* BCM5704 PX2B_REQ0_N PX2B_GNT0_N PXH (B)
Slot 2 PX2A_REQ0_N PX2A_GNT0_N PXH (A)
Slot 6 PX1B_REQ1_N PX1B_GNT1_N Intel
®
IOP332 Storage I/O
Processor (B)
Slot 7 PX1B_REQ0_N PX1B_GNT0_N Intel IOP332 Storage I/O
Processor (B)
LSI Logic* 53C1030 PX1A_REQ0_N PX1A_GNT0_N Intel IOP332 Storage I/O
Processor (A)
Intel
®
Fibre Channel Module PX1A_REQ1_N PX1A_GNT1_N Intel IOP332 Storage I/O
Processor (A)
3.1.4 Wake On LAN
Wake On LAN (WOL) is supported on the Intel
®
Server Board Set SE8500HW4 either from PCI
devices through the PME# signal, or PCI Express via the WAKE# signal.
Any PCI Express adapter can generate a wake event by asserting the WAKE# signal. This
signal is OR’d to all other PCI Express WAKE# signals and routed to the ICH5 after being
qualified with intrusion and a prior graceful shutdown. The assertion of a WAKE# signal will
cause the system to return to the ACPI S0 sleep state. Once system power is up and the PCI
Express devices are configured, a PME message is sent to the NB identifying the device that
woke the system.
For all the PCI devices or the Ethernet controller, PME# is handled similarly to the PCI Express
WAKE# signal. All PME# signals are OR’d together and routed to the ICH5 after being qualified
with intrusion and a prior graceful shutdown. The PME assertion wakes the system but does not
generate an interrupt from the ICH5. Once the system is powered up, the PXH or Intel
®
IOP332
Storage I/O Processor generate a PME interrupt message to the operating system. The
operating system determines which slot is the PME source by polling the PXH and Intel
®
IOP332 Storage I/O Processor.