Dell External OEMR R310 Technical Manual

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DellDell PowerEdge R310 Technical Guide 419.7 PCI InterfaceThe Intel 3420 PCI interface provides a 33 MHz, Revision 2.3 implementation. The Intel 3420 integrates a PCIarbiter that supports up to four external PCI bus masters in addition to the internal Intel 3420 requests. Thisallows for combinations of up to four PCI down devices and PCI slots.9.8 Low Pin Count Interface (LPC)The Intel 3420 implements an LPC Interface as described in the LPC 1.1 Specification. The Low Pin Count(LPC) bridge function of the Intel 3420 resides in PCI Device 31:Function 0. In addition to the LPC bridgeinterface function, D31:F0 contains other functional units including DMA, interrupt controllers, timers,power management, system management, GPIO, and RTC.9.9 Serial Peripheral Interface (SPI)The Intel 3420 implements an SPI Interface as an alternative interface for the BIOS flash device. An SPI flashdevice can be used as a replacement for the FWH, and is required to support Gigabit Ethernet, Intel® ActiveManagement Technology and integrated Intel Quiet System Technology. The Intel 3420 supports up to twoSPI flash devices with speed up to 50 MHz utilizing two chip select pins.9.10 Compatibility Module (MDA Controller, Timer/Counters, InterruptController)The DMA controller incorporates the logic of two 82C37 DMA controllers, with seven independentlyprogrammable channels. Channels 0–3 are hardwired to 8-bit, count-by-byte transfers, and channels 5–7 arehardwired to 16-bit, count-by-word transfers. Any two of the seven DMA channels can be programmed tosupport fast Type-F transfers.Channel 4 is reserved as a generic bus master request.The Intel 3420 supports LPC DMA, which is similar to ISA DMA, through the Intel 3420‘s DMA controller. LPCDMA is handled through the use of the LDRQ# lines from peripherals and special encoding on LAD[3:0] fromthe host. Single, Demand, Verify, and Increment modes are supported on the LPC interface.The timer/counter block contains three counters that are equivalent in function to those found in one 82C54programmable interval timer. These three counters are combined to provide the system timer function, andspeaker tone. The 14.31818 MHz oscillator input provides the clock source for these three counters.The Intel 3420 provides an ISA-Compatible Programmable Interrupt Controller (PIC) that incorporates thefunctionality of two, 82C59 interrupt controllers. The two interrupt controllers are cascaded so that 14external and two internal interrupts are possible. In addition, the Intel 3420 supports a serial interruptscheme.All of the registers in these modules can be read and restored. This is required to save and restore systemstate after power has been removed and restored to the platform.9.11 Advanced Programmable Interrupt Controller (APIC)In addition to the standard ISA compatible Programmable Interrupt controller (PIC) described in the previoussection, the Intel 3420 incorporates the Advanced Programmable Interrupt Controller (APIC).9.12 Universal Serial Bus (USB) ControllersThe Intel 3420 contains up to two Enhanced Host Controller Interface (EHCI) host controllers that supportUSB high-speed signaling. High-speed USB 2.0 allows data transfers up to 480 Mb/s. The PCH also containstwo Rate Matching Hubs (RMH) that support USB full speed and low-speed signaling.