1 / 9

Speed Performance Overview of Hardwired Structures in Digital Circuits

Understand basic delay models and components of hardwired structures, sample delays from various families, routing, and Antifuse delay models for improved performance. Get precise numbers and examples from Actel, XQR4000XL, and Virtex-4. Stay updated as work for better numbers is ongoing.

ember
Télécharger la présentation

Speed Performance Overview of Hardwired Structures in Digital Circuits

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Speed/Performance

  2. Overview • Basic Delay Model and Components • Sample Delays • Examples from different families • Hard-wired Structures • Routing • Arithmetic Logic

  3. Antifuse Delay Model

  4. Note: These numbers are approximate and work on better numbers is in progress. UTMC, for PAL and PROM, has about 8 to 10 fF.

  5. Hardwired Structures (1)Actel Routing Model Direct Connect Fast Connect (ns) (ns) RT54SX-1 0.2 1.1 RT54SXS-1 0.1 0.4

  6. Hardwired Structures (2) XQR4000XL-3 Carry Logic CLB Fast Carry Logic (max) TOPCY Operand inputs (F1, F2, G1, G4) to COUT 2.7 ns TASCY Add/subtract input (F3) to COUT 3.3 ns TINCY Initialization inputs (F1, F3) to COUT 2.0 ns TSUM CIN through function generators to X/Y outputs 2.8 ns TBYP CIN to COUT, bypass function generators 0.26 ns TNET Carry net delay, COUT to CIN 0.32 ns Note: Always use extracted values for real circuits.

  7. Hardwired Structures (3)Virtex-4 Carry Logic Notes 1. Values on rad-hard data sheet not available 2. Always use extracted values for real circuits TBYP (CIN to COUT): 200 ps, max

More Related