Intergraph RealiZm Graphics V25, Hardware User'S Manual

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Texture Memory
Texture memory is capable of storing several sets of MIP-mapped textures for subsequent
texture mapping. On the Z10-T, texture memory is fixed at 8 MB. On the Z13, Z25, and the
V25, two DIMM sockets may contain texture memory modules. The texture memory socket is
keyed for proper installation.
The available options for Z13 and Z25 are:
u
4 MB (two 2 MB DIMMs)
u
16 MB (two 8 MB DIMMs)
u
32 MB (two 16 MB DIMMs)
u
64 MB (two 32 MB DIMMs)
The available options for V25 are:
u
16 MB (two 8 MB DIMMs)
u
32 MB (two 16 MB DIMMs)
u
64 MB (two 32 MB DIMMs)
Resolver Architecture
For the Z10, two resolver ASICs perform the memory control function of reading and writing
data to the video memory. They also coordinate the movement of data from the video
memory to the video selector and mapper (VSM) ASIC and digital-to-analog converter
(DAC).
For the Z13, Z25, and the V25, a dual resolver ASIC contains two independent resolver
modules and one screen refresh module. Resolvers perform the memory control function for
reading and writing to the video memory. The screen refresh modules transfer pixel data from
the pair of resolvers to the DAC. A frame buffer consists of two or four dual resolver ASICs.
The Graphics Engine ASIC sends pixel data over the IZ bus to the resolvers’ IZ input FIFOs.
The FIFOs enable the resolvers to accommodate bursts of pixel data without slowing overall
Alignment Notches