1 Introduction
The TVP3026 is an advanced video interface palette (VIP) from Texas Instruments implemented in EPIC
0.2-micron CMOS process. The TVP3026 is a 64-bit VIP that supports packed-24 modes enabling 24-bit
true color and high resolution at the same time without excessive amounts of frame buffer memory. For
example, a 24-bit true color display with 1280 x 1024 resolution may be packed into 4M of VRAM. A
PLL-generated, 50 % duty cycle reference clock is output in the packed-24 modes, maximizing VRAM cycle
time and the screen refresh rate.
The TVP3026 supports all of the pixel formats of the TVP3020 VIP. Data can be split into 4 or 8 bit planes
for pseudo-color mode or split into 12-, 16- or 24-bit true-color and direct-color modes. For the 24-bit direct
color modes, an 8-bit overlay plane is available. The 16-bit direct- and true-color modes can be configured
to IBM XGA (5, 6, 5), TARGA (1, 5, 5, 5), or 16-bit/pixel (6, 6, 4) configuration as another existing format.
An additional 12-bit mode with 4-bit overlay (4, 4, 4, 4) is supported with 4 bits for each color and overlay.
All color modes support selection of little or big endian data format for the pixel bus. Additionally, the device
is also software compatible with the INMOS IMSG176/8 and Brooktree Bt476/8 color palettes.
Two fully programmable phase-locked loops (PLLs) for pixel clock and memory clock functions are
provided, as well as a simple frequency doubler for dramatic improvements in graphics system cost and
integration.AthirdloopclockPLLisincorporatedmakingpixeldatalatchtimingmuchsimplerthanwithother
existing color palettes. In addition, four digital clock inputs (2 TTL- and 2 ECL/TTL-compatible) may be
utilized and are software selectable. The video clock provides a software selected divide ratio of the chosen
pixel clock. The shift clock output may be used directly as the VRAM shift clock. The reference clock output
is driven by the loop clock PLL and provides a timing reference to the graphics accelerator.
Like the TVP3020, the TVP3026 also integrates a complete IBM XGA-compatible hardware cursor on chip,
making significant graphics performance enhancements possible. Additionally, hardware port select and
color-keyed switching functions are provided, giving the user several efficient means of producing graphical
overlays on direct-color backgrounds.
The TVP3026 has three 256-by-8 color lookup tables with triple 8-bit video digital-to-analog converters
(DACs) capable of directly driving a doubly terminated 75-Ω line. The lookup tables are designed with a
dual-ported RAM architecture that enables ultra-high speed operation. Sync generation is incorporated on
the green output channel. Horizontal sync (HSYNC) and vertical sync (VSYNC) are pipeline delayed
through the device and optionally inverted to indicate screen resolution to the monitor. A palette-page
register is available to select from multiple color maps in RAM when 4 bit planes are used. This allows the
screen colors to be changed with only one microprocessor write cycle.
The device features a separate VGA bus which supports the integrated VGA modes in graphics accelerator
applications, allowing efficient support for VGA graphics and text modes. The separate bus also is useful
for accepting data from the feature connector of most VGA-supported personal computers, without the need
for external data multiplexing.
The TVP3026 is highly system integrated. It can be connected to the serial port of VRAM devices without
external buffer logic and connected to many graphics engines directly. It also supports the split shift-register
transfer function, which is common to many industry standard VRAM devices.
The system-integration concept is even carried further to manufacturing test and field diagnosis. To support
these, several highly integrated test functions have been designed to enable simplified testing of the palette
and the entire graphics system.
EPIC is a trademark of Texas Instruments Incorporated.
XGA is a registered trademark of International Business Machines Corporation
TARGA is a registered trademark of Truevision Incorporated.
Brooktree is a trademark of Brooktree Corporation.
INMOS is a trademark of INMOS International Limited.
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