FBRAM: a new form of memory optimized for 3D graphics

  • Authors:
  • Michael F. Deering;Stephen A. Schlapp;Michael G. Lavelle

  • Affiliations:
  • Sun Microsystems Computer Corporation, 2550 Garcia Avenue, MTV18-212;Sun Microsystems Computer Corporation, 2550 Garcia Avenue, MTV18-212;Sun Microsystems Computer Corporation, 2550 Garcia Avenue, MTV18-212

  • Venue:
  • SIGGRAPH '94 Proceedings of the 21st annual conference on Computer graphics and interactive techniques
  • Year:
  • 1994

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Abstract

FBRAM, a new form of dynamic random access memory that greatly accelerates the rendering of Z-buffered primitives, is presented. Two key concepts make this acceleration possible. The first is to convert the read-modify-write Z-buffer compare and RGB&agr; blend into a single write only operation. The second is to support two levels of rectangularly shaped pixel caches internal to the memory chip. The result is a 10 megabit part that, for 3D graphics, performs read-modify-write cycles ten times faster than conventional 60 ns VRAMs. A four-way interleaved 100MHz FBRAM frame buffer can Z-buffer up to 400 million pixels per second. Working FBRAM prototypes have been fabricated.