VMIC VMIVME-7740 VME Single Board Compute 750

VMIC VMIVME-7740 VME Single Board Compute 750

This product bridges the traditionally divergent worlds of Intel-based PCs and

Motorola-based VMEbus controllers; therefore, some confusion over conventional

notation and terminology may exist. Every effort has been made to make this manual

consistent by adhering to conventions typical for the Motorola/VMEbus world;

nevertheless, users in both camps should review the following notes:

• Hexadecimal numbers are listed Motorola-style, prefixed with a dollar sign:

$F79, for example. By contrast, this same number would be signified 0F79H

according to the Intel convention, or 0xF79 by many programmers. Less

common are forms such as F79h or the mathematician’s F7916.

• An 8-bit quantity is termed a byte, a 16-bit quantity is termed a word, and a

32-bit quantity is termed a longword. The Intel convention is similar, although

their 32-bit quantity is more often called a doubleword.

• Motorola programmers should note that Intel processors have an I/O bus that

is completely independent from the memory bus. Every effort has been made in

the manual to clarify this by referring to registers and logical entities in I/O

space by prefixing I/O addresses as such. Thus, a register at I/O $140 is not the

same as a register at $140, since the latter is on the memory bus while the former

is on the I/O bus.

• Intel programmers should note that addresses are listed in this manual using a

linear, flat-memory model rather than the old segment:offset model associated

with Intel Real Mode programming. Thus, a ROM chip at a segment:offset

address of C000:0 will be listed in this manual as being at address $C0000. For

reference, here are some quick conversion formulas:

Segment:Offset to Linear Address

Linear Address = (Segment ´ 16) + Offset

Linear Address to Segment:Offset

Segment = ((Linear Address ¸ 65536) - remainder) ´ 4096

Offset = remainder ´ 65536

Where remainder = the fractional part of (Linear Address ¸ 65536)

Note that there are many possible segment:offset addresses for a single location. The

formula above will provide a unique segment:offset address by forcing the segment to

an even 64 Kbyte boundary, for example, $C000, $E000, etc. When using this formula,

make sure to round the offset calculation properly!

The VMIVME-7740 VMEbus interface is configured by programming the auxiliary

function global interrupt mask register, the external system registers, and the

Universe II Control and Status Registers. In addition, the board has four jumpers

which configure the board for generating/receiving VMEbus reset, asserting SYSFAIL

on powerup, and mapping the Universe II registers in memory or I/O space. Refer to

Chapter 2, Functional Description.

The base address of the various registers are located in either configuration space or

memory and can be accessed using PCI BIOS calls, or VMIC control function library

software. Refer to Appendix A for a complete description of interface registers.

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