Intel SC450NX Product Guide - Page 25
Video, SCSI Controller, A narrow SCSI controller SYM53C810AE is
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Video The onboard, integrated Cirrus Logic CL-GD5480 64-bit VGA chip contains an SVGA controller that is fully compatible with these video standards: CGA†, EGA†, Hercules† Graphics, MDA†, and VGA. The standard system configuration comes with 2 MB of 10 ns onboard video memory. The video controller supports pixel resolutions of up to 1600 x 1200 and up to 16.7 M colors. The SVGA controller supports analog VGA monitors (single and multiple frequency, interlaced and noninterlaced) with a maximum vertical retrace noninterlaced frequency of 100 Hz. You can not add video memory to this system. Depending on the environment, the controller displays up to 16.7 M colors in some video resolutions. It also provides hardware-accelerated bit block transfers (BITBLT) of data. SCSI Controller The baseboard includes two SCSI controllers. A narrow SCSI controller (SYM53C810AE) is on the PCI-A bus, and a dual-channel wide LVD/SE (Ultra2/Ultra) SCSI controller (SYM53C896) is on the PCI-B bus. The narrow provides support for the legacy 8-bit SCSI devices in the 5.25-inch drive bays. The wide drives one SCSI backplane and provides support for external expansion. Internally, each wide channel is identical, capable of operations using either 8- or 16-bit SCSI providing 10 MB/sec (Fast-10) or 20 MB/sec (Fast-20) throughput, or 20 MB/sec (Ultra), 40 MB/sec (Ultra-wide) or 80 MB/sec (40 Mhz) (Ultra-2). The SYM53C810AE (narrow) contains a high-performance SCSI core capable of Fast 8-bit SCSI transfers in single-ended mode. It provides programmable active negation, PCI zero wait-state bursts of faster than 110 MB/sec at 33 MHz, and SCSI transfer rates from 5 to 10 MB/sec. The narrow SCSI comes in a 100-pin rectangular plastic quad flat pack (PQFP) and provides an "AND tree" structure for testing component connectivity. The Sym53C896 (wide) contains a high-performance SCSI bus interface. It supports SE mode with 8-bit (10 or 20 MB/sec) or 16-bit (20 or 40 MB/sec) transfers and LVD mode with 8-bit (40 MB/sec) or 16-bit (80 MB/sec) transfers in a 329-pin ball grid array (BGA) package. Each controller has its own set of PCI configuration registers and SCSI I/O registers. As a PCI 2.1 bus master, the SYM53C896 supports burst data transfers on PCI up to the maximum rate of 132 MB/sec using on-chip buffers. In the internal bay, the system supports up to six one-inch SCSI hard disk drives, plus, in the 5.25-inch removable media bays, three SCSI or IDE devices (the controller itself supports more devices, but the 5.25-inch bay can contain a maximum of three devices). A wide SCSI cable provides two connectors for Ultra SCSI devices (one of these connectors is for the optional SCSI backplane, if your system has that). However, SCSI devices do not need to operate at the ultra transfer rate. All drives on the bus must be Ultra-2 (LVD) to run at 80MB/sec (40Mhz). The 5, 10, and 20Mhz operations can coexist on the bus and each device will interact at its appropriate speed. No logic, termination, or resistor loads are required to connect devices to the SCSI controller other than termination in the device at the end of the cable. The SCSI bus is terminated on the baseboard with active terminators that can be disabled. 25