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PNX17xx Series NXP Semiconductors Volume 1 of 1 Chapter 11: QVCP – Key1, (current color/chroma key pixel key OR new pixel key 1) – Key2 (New Pixel Key 2) – Key3 color key of the previous pixel Since each layer can have four color keys, the output is a 4-bit vector specifying which keys match the pixel. This 4-bit vector is masked by the ColorKeyMASK. The result is Key1. For Key3 the procedure is similar, with the only difference being the color key vector is passed from the previous mixer. The result of masking the color key vector with the ColorKeyMask register is Key3. However, one can do selective color keying for the current pixel. A ColorKeyROP specifies whether color keying is performed on the current layer pixel or not. Inputs for this ROP are Key0,1,2, 3. The ROP block decides if a certain operation is done on the pixel or not. The outputs of the Select, Alpha, Invert, Key_Pass and Alpha_pass ROPs are based on Raster operations as shown in Table 4. Table 4: ROP Table for Invert/Select/Alpha/KeyPass/AlphaPass ROPs ROP BIT Key3 Key2 Key1 Key0 0 0 0 0 0 1 0 0 0 1 2 0 0 1 0 3 0 0 1 1 4 0 1 0 0 5 0 1 0 1 6 0 1 1 0 7 0 1 1 1 8 1 0 0 0 9 1 0 0 1 10 1 0 1 0 11 1 0 1 1 12 1 1 0 0 13 1 1 0 1 14 1 1 1 0 15 1 1 1 1 Figure 5 illustrates the Mixer function. The upper part shows the generation of the signals which are used to control the actual pixel manipulation functions shown in Table 4. Remark: For mixer 1 there is no previous mixer and therefore the corresponding inputs are set to 0. PNX17XX_SER_1.11 Preliminary data sheet © NXP B.V. 2007. All rights reserved. Rev. 1.11 — 05 February 2007 11-17
