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XVME-653/658 Manual
and correction (ECC) or parity checking DRAM memory. Approved DRAM suppliers
are listed in Appendix A.
Secondary Cache
The XVME-653/658 comes equipped with 512 KB synchronous level 2 pipeline burst
cache.
Flash BIOS
The XVME-653/658 system BIOS is contained in a 512 KB flash device to facilitate
system BIOS updates. You can program and enable additional areas of the flash device to
provide optional ROM support. You should contact Xycom Automation for more infor-
mation on flashing option ROMs and video ROMs into the BIOS image.
ROM Site
This 32-pin onboard site supports nonvolatile SRAM and DiskOnChip.
Nonvolatile SRAM
The board supports 32K x 8 and 128K x 8 nonvolatile SRAM memory sizes. Packaged in
a standard 32-pin DIP format, the SRAM contains a built-in battery and battery backup.
Battery life is seven years minimum in absence of V
DiskOnChip
The DiskOnChip is a single-chip flash disk in a standard 32-pin DIP format. It requires
an 8 KB window to view as an extension BIOS. During boot up, the DiskOnChip loads
its software in the PC memory and installs itself as an additional drive. See Table 1-2 for
DiskOnChip size options.
Universal Serial Bus Port
The XVME-653/658 incorporates a Universal Serial Bus (USB) port that is compatible
with USB devices. The port terminates in a standard two-pin connector.
Serial and Parallel Ports
PC peripherals include two high-speed 16550-compatible serial ports and an ECP or EPP
configurable parallel port.
Mouse Port
The XVME-653/658 includes a PS/2-compatible mouse port.
1-4
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CC
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