VIC068A
VMEbus Interface Controller
Features
— Seven local interrupt lines
• Complete VMEbus interface controller and arbiter
— 58 internal registers provide configuration control
and status of VMEbus and local operations
— Drives arbitration, interrupt, address modifier utility,
strobe, address lines A07 through A01 and data lines
D07 through D00 directly, and provides signals for
control logic to drive remaining address and data
lines
— Direct connection to 68xxx family and mappable to
non-68xxx processors
• Complete master/slave capability
— Supports read, write, write posting, and block transfers
— Accommodates VMEbus timing requirements with
internal digital delay line (1⁄2-clock granularity)
— Programmable metastability delay
— Programmable data acquisition delays
— Provides timeout timers for local bus and VMEbus
transactions
• Interleaved block transfers over VMEbus
— Acts as DMA master on local bus
— Programmable burst count, transfer length, and interleaved period interval
— Supports local module-based DMA
• Arbitration support
— Supports single-level, priority and round robin arbitration
— Supports fair request option as requester
• Interrupt support
— Complete support for the VMEbus interrupts: interrupter and interrupt handler
Cypress Semiconductor Corporation
Document #: 38-09004 Rev. **
•
— 8-level interrupt priority encode
— Total of 29 interrupts mapped through the VIC068A
• Miscellaneous features
— Refresh option for local DRAM
— Four broadcast location monitors
— Four module-specific location monitors
— Eight interprocessor communications registers
— PGA or QFP packages
— Compatible with IEEE Specification 1014, Rev. C
— Supports RMC operations
• See the VMEbus Interface Handbook for more information
Functional Description
The VMEbus interface controller (VIC068A) is a single chip
designed to minimize the cost and board area requirements
and to maximize performance of the VMEbus interface of a
VMEbus master/slave module. This can be implemented on
VIC068A either an 8-bit, 16-bit, or 32-bit VMEbus system. The
VIC068A performs all VMEbus system controller functions
plus many others, which simplify the development of
VIC068Aa VMEbus interface. The VIC068A utilizes patented
on-chip output buffers. These CMOS high-drive buffers provide direct connection to the address and data lines. In addition to these signals, the VIC068A connects directly to the arbitration, interrupt, address modifier, utility and strobe lines.
Signals are provided which control data direction and latch
functions needed for a 32-bit implementation.
The VIC068A was developed through the efforts of a consortium of board vendors, under the auspices of the VMEbus International Trade Association (VITA). The VIC068A thus insures compatibility between boards designed by different
manufacturers.
3901 North First Street
•
San Jose
•
CA 95134 • 408-943-2600
Revised July 23, 1997
