CL-PS7500FE View Datasheet(PDF) - Cirrus Logic
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CL-PS7500FE Datasheet PDF : 251 Pages
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CL-PS7500FE
System-on-a-Chip for Internet Appliance
In this mode, with EREG[1:0] set to ‘0x10’, the video data is driven from the Blue LUT, then outputting data
BPD[7:0]. Depending on how the external serializer circuit is arranged, the LUT must be set up to give a
one-one correlation between the logical address and the physical data value. For example, if 4 bits are
externally serialized into a single bitstream, then select 4-bpp mode and use ED[6, 4, 2, 0]. Program the
lower 16 words of the Blue LUT to give all 16 combinations of BPD[6, 4, 2, 0]. If 8 bits are externally seri-
alized to give a single bitstream, then select 8-bpp mode and program all 256 values of the Blue LUT as
a one–one mapping.
Hardware cursor support is:
q The cursor palette is not used, although the Blue border may be programmed.
q Eight bits of cursor data (CD[7:0]) are defined for each normal pixel. The 8 bits are divided into 4 pairs, with
the LSB of each pair defining whether the video data (BPD) or the MSB of the cursor pair is displayed.
q Each cursor bit-pair operates on 2 bits of the BPD, according to Table 12-2 through Table 12-5.
If the external circuit serializes ED[6, 4, 2, 0] into a single bitstream or ED[7:0] into a 2-bit data stream,
the cursor can be positioned and defined to any µ-pixel: in each case the cursor can be transparent, black,
or white. If all 8 bits are serialized into a single very high-frequency bitstream, the cursor can only be posi-
tioned and defined to units of 2 µ-pixels.
Table 12-2. Deriving High-Speed 2-bit Cursor Data from the Normal 8-bit Output — CD[7:6]
CD[7]
0
0
1
1
CD[6]
0
1
0
1
ED[7]
BPD[7]
0
BPD[7]
1
ED[6]
BPD[6]
0
BPD[6]
1
Table 12-3. Deriving High-Speed 2-bit Cursor Data from the Normal 8-bit Output — CD[5:4]
CD[5]
0
0
1
1
CD[4]
0
1
0
1
ED[5]
BPD[5]
0
BPD[5]
1
ED[4]
BPD[4]
0
BPD[4]
1
Table 12-4. Deriving High-Speed 2-bit Cursor Data from the Normal 8-bit Output — CD[3:2]
CD[3]
0
0
1
1
CD[2]
0
1
0
1
ED[3]
BPD[3]
0
BPD[3]
1
ED[2]
BPD[2]
0
BPD[2]
1
128
VIDEO FEATURES
ADVANCE DATA BOOK v2.0
June 1997
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