Samsung S5PC100 User Manual page 1244

S5PC100 USER'S MANUAL (REV1.0)
2.4.2 Cache Control Register (GB_CACHECTL, R/W, Address = 0X0000_0004)
If you set VTCCLEAR to 1, VTCCLEAR becomes 0 automatically after a cycle. TCCLEAR is used to invalidate the
contents of texture cache0 and texture cache1. You can set TCCLEAR to 01, 10, or 11. After a cycle, TCCLEAR
becomes 00. CCFLUSH and ZCFLUSH fields in GB_CACHECTL are used to flush cache data into color and z
buffer. If you set CCFLUSH to 11, CCFULSH becomes 00 automatically when the flush operation is completed.
ZCFLUSH's operation is as same as CCFULSH.
GB_CACHECTL
Reserved
VTCCLEAR
Reserved
TCCLEAR
Reserved
CCFLUSH
Reserved
ZCFLUSH
2.4.3 Software Reset Register (GB_RST, W, Address = 0X0000_0008)
You can reset the core of 3D-ACCELERATOR with GB_RST register. However, the SFR values are not affected
by GB_RST. The reset bit of GB_RST is not recovered to 0 automatically. You must set GB_RST to 0 for the 3D-
ACCELERATOR's operation.
GB_RST
Reserved
Reset
Bit
[31:13] Reserved
[12] Vertex texture cache clear (Automatically set to 0b after a
cycle)
0 = default states; vertex texture cache invalidation
unchanged.
1 = vertex texture cache starts invalidation.
[11:10] Reserved
[9:8] Texture cache clear (Automatically set to 0b after a cycle)
00 = default states; both texture cache0 and cache1
unchanged.
01 = texture cache0 starts invalidation; texture cache1
unchanged
10 = texture cache1 starts invalidation; texture cache0
unchanged.
11 = both texture cache0 and cache1 start invalidation
[7:6] Reserved
[5:4] Color cache flush (Automatically set to 00b after flushing)
00 = color cache0, cache1 flush end
11 = color cache0, cache1 flush start
[3:2] Reserved
[1:0] Z cache flush (Automatically set to 00b after flushing)
00b = Z cache0, cache1 flush end
11b = Z cache0, cache1 flush start
Bit
[31:8] Reserved
[0] Reset signal for 3D-ACCELERATOR core (logic and internal
memory)
1 = Reset, 0 = Work
Description
Description
3D-ACCELERATOR
Reset Value
0
0b
0
00b
0
00b
0
00b
Reset Value
0
0b
9.6-17