Pay attention to portable design in Software Embed ANSI/AIM Code 39 in Software Pay attention to portable design

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Pay attention to portable design using software torender 39 barcode in web,windows application PLANET IC designer Software 3 of 9 barcode s time and again face the problem of porting a design from one implementation platform to another, e.g. when they Port a design from an FPGA to a cell-based ASIC, or vice versa, Upgrade to a more up-to-date target process or library, Incorporate a third-party circuit block into a larger design, or Accept a heritage design for integration.

. While it is possible to ne-tune almost any design for some given technology, employing asynchronous techniques can be disastrous when it comes to porting a design from one target platform to another. Think ahead and design for portability in the rst place. Observation 5.

11. Accept that almost all VLSI designs are subject to porting during their lifetime and stick to the established rules of safe design and synchronous operation to render the porting smooth and cost-e ective..

Design rule ANSI/AIM Code 39 for None s other than those given in this chapter are to follow in sections 6.5, 8.5, and 13.

4.2. Conversely, when being proposed an existing design, do not accept it unseen.

Be prepared to distillate the necessary functionality and reimplement it using a clocking discipline that is compatible with VLSI or your target PLD. Heritage designs on the basis of standard parts such as microprocessors and LSI/MSI circuits notoriously include the worst examples of asynchronous design tricks. Also note that on-chip memories often are at the origin of portability problems because of the many varieties being o ered.

. Architecture of VLSI Circuits 5.5 Conclusions r Among the three grand alternatives for clocking digital circuits, ad-hoc asynchronous operation has been found to be unsafe and ine cient in VLSI.. r While saf barcode code39 for None e if implemented correctly, self-timed operation at the gate level entails an unacceptable overhead in terms of hardware and energy, and necessitates out-of-the-normal design methodologies, software tools, and library cells.. r Synchrono us operation of large system chunks does away with almost all timing problems,. results in Software 3 of 9 barcode e cient circuits, and is compatible with today s design automation ows and cell libraries. There hardly is a better choice for VLSI, especially when there is high pressure on tight schedules and high design productivity..

r Synchronous circuits exhibit a strict dissociation of signals into One clock 3 of 9 for None signal (possibly more of xed frequency and phase relationship), One asynchronous reset signal (optional), An arbitrary number of information signals.. r HDL synthesis does not relieve designers of deciding about clocking disciplines and clock domains as it is possible to express any clocking discipline in an RTL circuit model. 5.6 Problems 1. Fig.5.

4c Software ANSI/AIM Code 39 and d depict two feedback circuits, each built from a few logic gates. Establish their respective truth tables and discuss your ndings. 2.

The circuit of g.5.4c behaves much like a latch where D acts as data input and E as enable input.

Explain why this construct does not qualify as a latch in synchronous designs. 3. Come up with a synchronous implementation for the modulo-15 counter of g.

5.7. Compare the relative sizes of the two alternatives on the basis of the assumption that both counters are built from D-type ip- ops.

4. FireWire is the name of a serial bus for interconnecting computer and multimedia equipment. To facilitate the delimiting and recovering of individual bits from the data stream at the receiver end, data get conveyed one bit after the other coded using two peer signals (the fact that two di erential signal pairs are actually being used does not matter in this context).

The rst signal termed data simply corresponds to the incoming data whereas its companion is to feature a transition at the boundary between any two adjacent bits i the rst signal does not. Thus, at either end of a FireWire link, a modulator circuit in the transmitter converts the incoming serial data stream into a data-plus-companion pair, while a demodulator on the receiving side is in charge of recovering the initial data from that signal pair. Design both a modulating and a demodulating circuit.

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