Embedded Pc/Rtos Features; Vme Bridge; Features - GE VMIVME-7807 Series Hardware Reference Manual

3 • Embedded PC/RTOS Features

3.1 VME Bridge

32 VMIVME-7807/VME-7807RC Hardware Reference Manual
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GE's VMIVME‐7807/VME‐7807RC feature additional capabilities beyond those of
a typical desktop computer system. The units provide four software‐controlled,
general‐purpose timers along with a programmable Watchdog Timer for
synchronizing and controlling multiple events in embedded applications. The
VMIVME‐7807/VME‐7807RC also provide a bootable CompactFlash system and
32 KByte of non‐volatile RAM. Also, the VMIVME‐7807/VME‐7807RC support an
embedded intelligent VME bridge to allow compatibility with the most
demanding VME applications. These features make the unit ideal for embedded
applications, particularly where standard hard drives and floppy disk drives
cannot be used.
In addition to their desktop functions, the VMIVME‐7807/VME‐7807RC have the
following VME features:

3.1.1 Features

• Complete six‐line Address Modifier (AM‐Code) programmability
• VME data interface with separate hardware byte/word swapping for master
and slave accesses
• Support for VME64 multiplexed MBLT 64‐bit VME block transfers
• User‐configured interrupter
• User‐configured interrupt handler
• System Controller mode with programmable VME arbiter
(PRI, SGL and RRS modes are supported)
• VME BERR bus error timer (software programmable)
• Slave access from the VME to local RAM and mailbox registers
• Full‐featured programmable VME requester
(ROR, RWD and BCAP modes are supported)
• System Controller auto detection
• Complete VME master access through five separate Protected‐mode mem‐
ory windows
The VMIVME‐7807/VME‐7807RC support High Throughput DMA transfers of
bytes, words and longwords in both Master and Slave configurations.
If Endian conversion is not needed, GE offers a special "Bypass" mode that can be
used to further enhance throughput (not available for byte transfers).
The VMIVME‐7807/VME‐7807RC VME interfaces are provided by the PCI‐to‐
VME bridge built around the Tundra Semiconductor Corporation Universe II
VME interface chip. The Universe II provides a reliable high‐performance 64‐bit
VME‐to‐PCI interface in one design. The functions and programming of the
Universe‐based VME interface are addressed in detail in a companion manual
titled: GE's Tundra Universe II Based VME Interface Product Manual
(500‐000211‐000).