soft core


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soft core

A block of digital logic that is designed to be implemented in an ASIC or FPGA chip. A soft core is typically delivered in RTL, which is a hardware description language that defines logic at a higher level than a "hard core," which is at the gate level. A chip design may comprise one or more soft cores combined with one or more hard cores along with other blocks of user-defined logic. Occasionally, soft cores are delivered as gate-level netlists or schematics rather than RTL.

Soft Cores in ASICs
For ASIC chips, the RTL soft core and other RTL associated with the design are synthesized into a gate-level netlist. Based on the netlist, the logic gates are placed and routed and then turned into photomasks to make the chip. The ultimate realization of the soft core is hardwired logic gates formed of transistors and their interconnections.

Soft Cores in FPGAs
With FPGAs, the resulting netlist is used to generate a configuration file that will be used to program the lookup tables and configurable logic blocks inside the device. See core, hard core, netlist, ASIC and FPGA.


How Soft Cores Fit In
Soft cores delivered in RTL are the first stage of circuit development. This chart illustrates an ASIC chip. With FPGAs, the microprocessor core and other IP blocks are already in place. Consequently, instead of a gate-level netlist, a lookup table/configurable logic block (LUT/CLB) netlist is created, and the final output for FPGAs is a configuration file rather than GDSII files.
References in periodicals archive ?
soft core simply presents the logical structure of a hardware circuit.
"At the same time, the Chicago board took a firmer stand against two exploitive features," soft core films Rent-a-Girl and Body of a Female, which local distributor Chuck Teitel wanted to screen with equal freedom, since "All three films had been found obscene by the local censorship board." Proving that censorship boards were drawn to power as much as pornographers to money, "Reade, a more mainstream and wealthy player, received preferential treatment," said Lewis, also pointing out that "Reade had the money to support opposition candidates in upcoming elections."
Gritty dance teacher Julie Walters is all for it in a Full Monty-style melodrama with a soft core. A spine-tingling and emotional crowd pleaser.
Alcatel's Technology Licensing Group has expanded its suite of Ethernet media access controller (MAC) core products with a 10Gb reusable MAC soft core.
Combine these three things, and you have what is destined to be the hottest love scene of the summer, Or at least the funniest, "I have to admit, I always sort of wanted to know what it was like to do a sex scene in a movie," admits Busch, who as Captain Monica Sharp has a flashback to her romance with Gibson's Kanaka, "But I did feel a little bit like I was in a '70s soft core porno movie.
Zilog's processor roadmap includes combining "the architectural advantages of CISC, RISC and DSP functionality into one Soft Core." Tensilica will install an on-site version of the Processor Generator at Zilog's headquarters, which will be made available to all Zilog design centers via intranet link.
Pulling harder can create another problem: It can deform the soft core of a heavy profile, building in stresses that could cause unacceptable shrinkage later.
On the other hand, "soft core" properties such as being absolutely simple, being unrestrictedly omnipotent, and admitting of no distinction between essence and existence "have come and gone as part of the sense of 'God' without affecting the referent" (p.
August CPI revealed a surprisingly soft core price rise, alongside the expected headline gain.