VFG-M Rastergraf Dual High Resolution Graphics Controller

The Rastegraf / Peritek VFG-M Dual High Resolution Graphics Controller with Dual Video Digitizers and 2-Port USB Controller is a single PMC video input and graphics display controller for VMEbus and CompactPCI computers.

The VFG-M features Two independent 50 MHz Cirrus Logic CLGD7555s, which each include a 64-bit BitBLT engine, 64-bit memory interface, and 64-bit data paths, BitBLT setup register double buffering with auto start, transparent BitBLT (source color key), memory-mapped I/O, and programmable video timing. Multiple apertures in the 7555 enable interleaved graphics and video data blocks. VGA Compatibility is included. The maximum supported frequencies are 135 MHz for the pixel clock and 100 MHz for the memory clock.

The 4 MB DRAM display memory is 64-bits/word, byte addressable, no wait state and gives three pages of 1280 x 1024 using 8-bit pixels, 1.5 pages using 16-bit pixels, or one page using packed 24 bpp mode.

A 64 KB EEPROM on Channel A is normally loaded with VGA BIOS or SPARC Fcode. A 2Kb Serial EEPROM (controlled by PCI2031 PIO bits) stores PCI2031 power-up, and Rastergraf / Peritek and customer codes.

Display Output Features include an integral color lookup table (RAMDAC) with a 24-bit true-color palette and 8-bit DACs with support for gamma/color adjustment in High and True-Color modes. Integrated color space converter for 4:2:2 YCrCb to RGB 8:8:8. Hardware destination color and chroma-key support (hardware occlusion). Video format support for 24 and 16-bpp RGB and 4:2:2 YCrCb. The RAMDAC has a 64 x 64 x 2 bitmap cursor. A color key can be used to switch the CLUT from passing the RGB components straight through to sampling the pixel to the color map, thus providing a mapped overlay value. Scroll on single line (smooth scroll) and pan anywhere on 8 pixel boundaries are supported

The 7555 supports analog displays on 5 Wire (RGBHV) output up to 1280 x 1024 x 24 bpp. Composite sync on green is not manufactured.