Intel SC450NX Product Guide - Page 24

Peripherals Super I/O Chip The 87309 device supports two serial ports, one parallel port, diskette drive, and PS/2-compatible keyboard and mouse. The system provides the connector interface for each port. Serial Ports Both serial ports are relocatable. By default, port A is physically the top connector, port B on the bottom. Each serial port can be set to one of four different COMx ports, and each can be enabled separately. When enabled, each port can be programmed to generate edge- or level-sensitive interrupts. When disabled, serial port interrupts are available to add-in boards. Parallel Port The 25/15-pin connector stacks the parallel port over the VGA. The 87309 provides one IEEE 1284-compatible 25-pin bidirectional EPP (supporting levels 1.7 and 1.9). BIOS programming of the 87309 registers enables the parallel port and determines the port address and interrupt. When disabled, the interrupt is available to add-in boards. Add-in Board Slots The baseboard has one ISA slot that is full-length if the wide SCSI-B slot is not used (and halflength if the wide SCSI-B slot is used); the ISA slot supports slave-only boards and is shared with PCI-B slot 4. The ISA has three embedded devices: the Super I/O chip, Baseboard Management Controller (BMC), and flash memory for system BIOS. ISA features: • Bus speed up to 8.33 MHz • 16-bit memory addressing • Type A transfers at 5.33 MB/sec • Type B transfers at 8 MB/sec • 8- or 16-bit data transfers • Plug and Play ready The baseboard has two 32-bit PCI bus segments: PCI-A and PCI-B. These provide seven slots for PCI add-in boards: three on PCI-A and four on PCI-B. PCI-B4 is shared with the ISA slot. PCI-A1 supports half-length boards only. The other slots support full-length boards. PCI features: • 33 MHz bus speed • 32-bit memory addressing • 5 V signaling environment • Burst transfers of up to 133 MB/sec • 8-, 16-, or 32-bit data transfers • Plug and Play ready • Parity enabled 24