Vax 613 0S Manuel d'instructions Page 95

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6.4.6 PixelShift Register
The PixelShift value is used in copy mode only. The PixelShift defines which one
of 16 shift values is performed on data before it is written into the copy buffer.
The shift value is either negative or positive, based on the most significant bit of
the PixelShift. A 1 in the most significant bit signifies a negative shift amount
and a negative address increment.
Note
Value at initialization: 0
The registers format and contents are:
04 03 0031
MR−0091−93RAGS
RESERVED PIXELSHIFT
6.4.7 Address Register
The address register is loaded with a start address of any operation. It can be
loaded at any time before its use. When or not the START register address is
written, the first address for that operation is copied from the start register.
Note
Value at initialization: 0
The registers format and contents are:
0024 2331
MR−0092−93RAGS
RESERVED ADDRESS VALUE
6.4.8 DEEP Register
The DEEP bits are set to determine which type of frame buffer the ASIC is
supporting. The ASIC can potentially support 8-, 16- or 32-plane frame buffers.
The decode for the DEEP register is defined below:
Bits Frame buffer
00 8-plane
01 8-plane
10 16-plane
11 32-plane
CXTurbo Graphics Subsystem: 300/500 Models 6–15
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