Publication No: 500-9300007768-000 Rev. H.0
Embedded PC/RTOS Features 47
3 • Embedded PC/RTOS Features
Abaco Systems’ V7768/V7769 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
V7768 provides a bootable CompactFlash Disk system and 32KByte of non-
volatile RAM. Also, the V7768/V7769 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.
3.1 VME Bridge
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
memory windows
The V7768/V7769 support High Throughput DMA transfers of bytes, words and
longwords in both Master and Slave configurations.
If Endian conversion is not needed, Abaco offers a special “Bypass” mode that can
be used to further enhance throughput (not available for byte transfers).
The V7768/V7769 VME interface is provided by the PCI-to-VME bridge built
around the Tundra Semiconductor Corporation Universe IID VME interface chip.
The Universe IID 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:
Abaco’s
Tundra Universe II Based VME Interface Product Manual (500-000211-000)
.