MB86293 'CORAL Q'

The new Coral device family offers an increased internal operating frequency of 166MHz, a 64-bit memory bus, support for six independant layers, advanced alpha-blending features and enhanced video input facilities. The higher internal frequency of 166MHz (400MHz for display dot clocks) enables the rendering engine of the devices to achieve a factor 10 improvement in texture mapping and drawing image quality compared to the previous graphic controller devices.

The enhanced bandwidth allows a much greater rate of access for graphics elements and delivers improved scanning functions at higher display resolutions. The Coral Q and Coral B devices are compatible with host CPU buses including Fujitsu FR, Hitachi SH3 and SH4 and NEC V83 without external glue logic. All devices are binary compatible with previous generation graphic display controllers, like the Cremson, Orchid and Scarlet devices. This helps to speed up developments and save costs because existing software modules (e.g. map renderer) and drivers can be used without any modifications. An enhancement to 2D drawing functions is the integration of a line depth display facility, which clearly defines the correct respective level of intersecting map lines. In previous devices, additional software was required to achieve this level of refinement. Enhanced hardware design also provides improvements in pattern line performance.

All Coral devices address up to 64MB of external SDRAM or FCRAM memory @133MHz and are capable of adjusting picture sizes to optimize the available memory space. All layers can have a colordepth of 8,16 or 24 bits/pixel and can be changed in position, size and priority. The maximum logical layersize has been increased to 4096x4096 pixels.

Key features

• CMOS 0.18µm technology
• Display resolutions up to 1024x768
• 6 layers of overlay display (windows)
• Alpha Plane
• Geometry processor
• RGB digital output (8bit x 3)
• RGB analog output
• Includes various kinds of 2D/3D graphic acceleration functions
• Built-in alpha blending, anti-aliasing and chroma-keying
• External SDRAM or FCRAM interface @ 133MHz for up to 64MB graphic memory
• Configurable CPU-interface for FR30, SH3, SH4, V83x CPUs
• Supply voltage 3.3V (I/O), 1.8V (Internal)
• QFP-256 Package
• Temperature range -40..+85 °C