Cypress Semiconductor: Getting market faster, more competitively

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Cypress Semiconductor: Getting market faster, more competitively

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Cypress Semiconductor: Getting market faster, more competitively
Volume2, Number2 April -June 1996
This Issue's Technology Perspective: Dual-Port RAMs
dual-port random-access memory that accessed simultaneously independent entities. This implies dual-port memory cell which both ports accessed simultaneously, using independent sets address, data, control lines. Early computers used contents memory location operand accumulator second operand. results were usually stored accumulator. first multiport memories were probably used first computers; many two-operand instructions efficiently implemented using dual-port registers operands result. 74181 first ALU. 4-bit operands operated upon according 4-bit command, result output. 74181 combinatorial device provides storage. 67901 first 4-bit slice that brought sixteen 4-bit registers onto chip. secondsourced AMD, becoming 2901. time, five vendors offered this industry-standard bipolar Cypress CMOS CY7C901 highestperformance, TTL-compatible, 4-bit-slice workalike; 16-word-deep, 4-bit-wide register array that functionally equivalent dual-port memory. Before dual-port memory cell existed, designers created dual-port RAMs from single-port RAMs adding multiplexer between entities that shared first applications dual-port memories were register files. They also serve cache memories data instructions. However, largest usage dual-port RAMs communications, which includes exchange data between processors, processes, systems. Communication between systems does require physical dual-port RAMs. Instead, conventional memory partitioned into virtual data-storage areas, buffers, usually storing least data packets. buffers shared between communications controller intelligent element that assembles packets stores them-usually microprocessor. system conALU.
tains only processor, however, data buffers shared system needs neither virtual physical dual-port RAM. first dual-port dual-port cell were introduced 1983, Synertek. Even original dual-port RAMs included mailboxes message passing. concept "slave" companion introduced 1985, means expand word width under control "master." Most dual-port market today functionally equivalent original Synertek products. Some, however, include significant features, among them dedicated semaphore registers used Cypress dual-ports provide efficient means allocating exclusive priority accesses blocks shared memory locations. learn more about dual-port RAMs, read chnology Perspective starting page
application assistance when need Web, http://www.cypress. then click "Support" Email: cyapps@cypress. product literature, list Cypress site URLs back cover.
Inner workings. left-right symmetry dual-port calls left right sets address, data, control signals. Address inputs (A0, unidirectional into device; their states specify memory location read from written Data pins I/O1, bidirectional; their states represent either data written data read. Besides such standard control signals chip enable (CE), read/write (R/W), output enable (OE), plus interrupt (INT) BUSY flags, some dual-ports have semaphore-enable (SEM) control pin; semaphores permit software handshaking between ports.
INSIDE THIS ISSUE
Page UltraLogicTools Page Design Tips Page Technology Perspective Page Dual-Port RAMs Page UltraLogic Solutions
Cypress's Warp2 Release offers power $20,000+ design tool just
Here's clever multiple operands using minimal logic FPGA
Part specialty memories gives low-down dual-port RAMs
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Programmable Logic
Cypress CY7C371 CPLD generate flags needed monitor FIFO content
News
Visit Cypress worldwide http:/ /www.cypress.com
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Cypress Semiconductor: Getting market faster, more competitively

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