PXD20RM Datasheet, PDF (563/1628 Pages) Freescale Semiconductor, Inc – PXD20 Microcontroller

area of interest
CRC Layer (Intersection of both
area of interest and Safety Layer)
Safety Layers/Tag
Note: Enable to CRC is sent for the
dark pink Portion
Figure 12-86. Safety Mode with DCU_MODE[TAG_EN] = 1
12.7.2 Summary of operation
The area included in the CRC calculation is summarized in Table 12-72. The initial value on all CRC
calculations is 0x00000000.
Table 12-72. Supported area
Area
Full
Part
Safety Layer
(Layer 0 and 1 only)
DCU_MODE[TAG_EN]
Note
1’b0
SIGN_CALC_2[SIG_HOR_POS] = 0
SIGN_CALC_2[SIG_VER_POS] = 0
SIGN_CALC_1[SIG_HOR_SIZE] = Panel width
SIGN_CALC_1[SIG_VER_SIZE] = Panel height
1’b0
The SIGN_CALC parameters have values other than
those mentioned above — see Figure 12-85
1’b1
The included portion of the safety layers depends on
• The portion lying within the area defined by
SIGN_CALC_1 and SIGN_CALC_2
• The pixels removed by chroma keying functionality
Freescale Semiconductor
PXD20 Microcontroller Reference Manual, Rev. 1
Preliminary—Subject to Change Without Notice
12-101