Expansion Options; On-Board Memory - Xycom XVME-655 Manual

Expansion Options

The XVME-655 offers PCI, PC/104, and Ethernet expansion options. Ethernet expansion
is available through the XVME-978 Ethernet expansion module. By simply plugging the
XVME-978 directly into the XVME-655 PCI expansion connector, you add 32-bit bus
mastering PCI Ethernet controller capabilities to your VMEbus system.
PC/104 and PCI Mezzanine Card (PMC) expansion is available through the XVME-976
module, which plugs into the XVME-978. The XVME-976 offers PMC and PC/104
sites, allowing easy integration of PC/AT-compatible modules in your VMEbus system.

On-board Memory

DRAM Memory
The XVME-655 has two 72-pin SIMM memory sites, providing up to 64 Mbytes of
DRAM. The memory sites can be populated by standard fast page mode memory or
extended data out memory (EDO). EDO memory is designed to improve DRAM read
performance. Using EDO memory improves the back-to-back burst timing to 2-2-2 from
3-3-3 of standard memory.
Secondary Cache
All CPU configurations except the 75 MHz and 100 MHz models come equipped with
512 Kbyte pipeline burst cache.
Flash BIOS
The XVME-655 board provides a location for a Flash BIOS that is used for system and
video BIOS. The Flash socket supports a 256 Kbyte x 8-bit or 512 Kbyte x 8-bit device.
System BIOS and video BIOS are memory mapped in two locations in the Flash device.
Table Chapter 1 -1 provides the memory map for the 512 Kbyte Flash device.
Device Address
70000h-7FFFFh
60000h-6FFFFh
50000h-5FFFFh
48000h-4FFFFh
40000h-47FFFh
30000h-3FFFFh
20000h-2FFFFh
10000h-1FFFFh
08000h-0FFFFh
00000h-07FFFh
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Table Chapter 1 -1. 512 Kbyte Flash Memory Map
Device System Address
System BIOS F0000h-FFFFFh also FFFF0000h-FFFFFFFFh
System BIOS E0000h-EFFFFh also FFFE0000h-FFFEFFFFh
Option ROM D0000h-DFFFFh also FFFD0000h-FFFDFFFFh
Option ROM C8000h-CFFFFh also FFFC8000h-FFFCFFFFh
Video BIOS C0000h-C7FFFh also FFFC0000h-FFFC7FFFh
System BIOS F0000h-FFFFFh also FFFF0000h-FFFFFFFFh
System BIOS E0000h-EFFFFh also FFFE0000h-FFFEFFFFh
Option ROM D0000h-DFFFFh also FFFD0000h-FFFDFFFFh
Option ROM C8000h-CFFFFh also FFFC8000h-FFFCFFFFh
Video BIOS C0000h-C7FFFh also FFFC0000h-FFFC7FFFh
Chapter 1 – Introduction
1-3