ZR36016 Просмотр технического описания (PDF) - Zoran Corporation
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ZR36016 Datasheet PDF : 36 Pages
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Integrated Color Space / Raster-To-Block Converter
Data Representation
The results of color space conversion are limited and rounded to
8 bits. These results may be output with the full 256 levels or
reduced to 220 levels as specified by the CCIR R601.2 stan-
dard, by using the CCIR bit in Setup Register 2. The R,G,B and
Y values are always unsigned, but offset binary or 2’s comple-
ment representation may be selected for Cr and Cb signals by
the SIGN bit. These choices are shown in Table 12 and
Table 13.
Table 12: Data Representation With CCIR = 0
CCIR = 0
Hex
Decimal
0xFF
255
0xFE
254
:
:
0x81
129
0x80
128
0x7F
127
:
:
0x01
1
0x00
0
R, G, B, Y
Unsigned
255
254
:
129
128
127
:
1
0
Cr, Cb
SIGN = 0
Offset Binary
127
126
:
1
0
-1
:
-127
-128
Cr, Cb
SIGN = 1
2's Complement
-1
-2
:
-127
-128
127
:
1
0
Table 13: Data Representation With CCIR = 1
CCIR = 1
Hex
Decimal
0xFF
255
0xFE
254
:
:
0xF1
241
0xF0
240
:
:
0xEC
236
0xEB
235
:
:
0x91
145
0x90
144
:
:
0x81
129
0x80
128
0x7F
127
:
:
0x70
112
0x6F
111
:
:
0x10
16
0x0F
15
:
:
0x01
1
0x00
0
R, G, B, Y
Unsigned
235
235
:
145
144
:
129
128
127
:
112
111
:
16
16
Cr, Cb
SIGN = 0
Offset Binary
112
112
:
108
107
:
17
16
:
1
0
-1
:
-16
-17
:
-112
-112
Cr, Cb
SIGN = 1
2's Complement
-1
-2
:
-15
-16
:
-20
-21
:
-111
-112
-112
112
112
111
:
16
15
:
1
0
HIN and VIN
The following restrictions must be observed for the HIN signal.
The low interval (A in Figure 9) must be at least two PXCLK
cycles. In addition the total period must be an even number of
PXCLK cycles (B in Figure 9).
When PXEN is used to control the pixel data flow, the effective
number of PXCLK cycles is modified. Effective cycles are
counted only when PXEN is active, as illustrated in Figures 10
and 11.
The low interval of VIN must be at least 2 PXCLK cycles.
HIN
A
B
Figure 9. Restrictions for HIN
PXCLK
HIN
PXEN
“LOW”
1
2
3
4
5
6
Figure 10. Effective PXCLK Cycles (6 Effective Cycles)
PXCLK
HIN
PXEN
1
X
X
1
2
3
4
Figure 11. Effective PXCLK Cycles (4 Effective Cycles)
13
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