TVP4020
Programmers Reference Manual
Graphics Register Reference
217
Name:
Localbuffer Read Mode
Unit:
Localbuffer R/W
Region: 0
Offset:
0x0000.8880
Tag:
0x0110
Reset Value:
Undefined
Read/write
0
8
16
24
31
Reserved
PP2
Reserved
PP1
PP0
Partial product selection
ReadSource enable
ReadDestination enable
Data Type
Window origin
Patch Enable
Controls reading from localbuffer memory.
Incorrect data can be read if reads are enabled but the same data had just been written
with reads disabled. To avoid this problem, a WaitForCompletion command should be sent
after enabling reads, but prior to the next primitive.
Bit0-2
Partial Product 0 - See Appendix C for a table of values
Bit3-5
Partial Product 1 - See Appendix C for a table of values
Bit6-8
Partial Product 2 - See Appendix C for a table of values
Bit9
Read Source Enable:
0 = no read
1 = do read
Bit10
Read Destination Enable:
0 = no read
1 = do read
Bit16-17
Data Type:
0 = Default
1 = Localbuffer Stencil
2 = Localbuffer Depth
Bit18
Window Origin:
0 = Top left
1 = Bottom left
Bit19
Patch Enable
0 = Disable
1 = Enable patched addressing of the localbuffer
LBReadMode
Summary of Contents for TVP4020 PERMEDIA 2
Page 1: ...Texas Instruments TVP4020 PERMEDIA 2 Programmer s Reference Manual Issue 4 ...
Page 284: ...TVP4020 Programmers Reference Manual A Gouraud Shaded Triangle 275 ...
Page 292: ...TVP4020 Programmers Reference Manual Register Tables 283 ...
Page 314: ...TVP4020 Programmers Reference Manual Index 305 ...
Page 315: ...Index TVP4020 Programmers Reference Manual 306 Index ...
Page 323: ...Index TVP4020 Programmers Reference Manual 314 ...