MB86276 64CBW 64L1W - Datasheet Archive

 

Horizontally reversing a captured image MB86276 'Lime' © Fujitsu Microelectronics Europe GmbH History Date 28.05.2010 Author

 

Application Note Horizontally reversing a captured image MB86276 MB86276 'Lime' © Fujitsu Microelectronics Europe GmbH History Date 28.05.2010 Author AvT Version V1.00 Comment First version for Lime 1 Warranty and Disclaimer To the maximum extent permitted by applicable law, Fujitsu Microelectronics Europe GmbH restricts its warranties and its liability for all products delivered free of charge (e.g. software include or header files, application examples, target boards, evaluation boards, engineering samples of IC's etc.), its performance and any consequential damages, on the use of the Product in accordance with (i) the terms of the License Agreement and the Sale and Purchase Agreement under which agreements the Product has been delivered, (ii) the technical descriptions and (iii) all accompanying written materials. In addition, to the maximum extent permitted by applicable law, Fujitsu Microelectronics Europe GmbH disclaims all warranties and liabilities for the performance of the Product and any consequential damages in cases of unauthorised decompiling and/or reverse engineering and/or disassembling. Note that all these products are intended and must only be used in an evaluation laboratory environment. 1. Fujitsu Microelectronics Europe GmbH warrants that the Product will perform substantially in accordance with the accompanying written materials for a period of 90 days form the date of receipt by the customer. Concerning the hardware components of the Product, Fujitsu Microelectronics Europe GmbH warrants that the Product will be free from defects in material and workmanship under use and service as specified in the accompanying written materials for a duration of 1 year from the date of receipt by the customer. 2. Should a Product turn out to be defect, Fujitsu Microelectronics Europe GmbH's entire liability and the customer's exclusive remedy shall be, at Fujitsu Microelectronics Europe GmbH's sole discretion, either return of the purchase price and the license fee, or replacement of the Product or parts thereof, if the Product is returned to Fujitsu Microelectronics Europe GmbH in original packing and without further defects resulting from the customer's use or the transport. However, this warranty is excluded if the defect has resulted from an accident not attributable to Fujitsu Microelectronics Europe GmbH, or abuse or misapplication attributable to the customer or any other third party not relating to Fujitsu Microelectronics Europe GmbH. 3. To the maximum extent permitted by applicable law Fujitsu Microelectronics Europe GmbH disclaims all other warranties, whether expressed or implied, in particular, but not limited to, warranties of merchantability and fitness for a particular purpose for which the Product is not designated. 4. To the maximum extent permitted by applicable law, Fujitsu Microelectronics Europe GmbH's and its suppliers´ liability is restricted to intention and gross negligence. NO LIABILITY FOR CONSEQUENTIAL DAMAGES To the maximum extent permitted by applicable law, in no event shall Fujitsu Microelectronics Europe GmbH and its suppliers be liable for any damages whatsoever (including but without limitation, consequential and/or indirect damages for personal injury, assets of substantial value, loss of profits, interruption of business operation, loss of information, or any other monetary or pecuniary loss) arising from the use of the Product. Should one of the above stipulations be or become invalid and/or unenforceable, the remaining stipulations shall stay in full effect 2 Contents Warranty and Disclaimer .2 1 Horizontally reversing a Captured Image .4 1.1 Specifying the Capture Buffer Area.4 1.2 Offset of L1 Display Address .4 1.3 Special Setting for YCbCr to RGB Conversion .5 3 1 Horizontally reversing a Captured Image In order to horizontally reverse a captured image, it is necessary to write a '1' to the HRV (H-reverse) bit of the CBM register. Please however, that is it is also necessary to make the settings described in the following sections. 1.1 Specifying the Capture Buffer Area The method used to specify the range in the capture buffer is little different for a horizontally reversed image. The same method is used to specify the first raster and the last raster in the capture buffer. If the horizontal reverse function is not used, the first address of the raster is specified. If the horizontal reverse function is used, the last address of the raster is specified. The head of the raster corresponds to the left edge of the image. The tail of the raster corresponds to the right edge of the image (see below). CBOA ( head of first raster) CBOA' = CBOA+64*CBW-8 (tail of first raster ) Address increment Address decrement Stride = 64CBW 64CBW(byte) Stride = 64CBW 64CBW(byte) CBLA ( head of last raster ) CBLA'= CBLA+64*CBW-8 Normal Capture (tail of last raster ) H-reverse Capture In the case of a horizontal reverse, write operations progress from right to left, i.e, in the direction of decreasing addresses. The data position in 1word=64bit is reversed and written as shown below. Bit position 55-48 47-40 39-32 31-24 23-16 15-8 7-0 No reverse Y3 Cr1 Y2 Cb1 Y1 Cr0 Y0 Cb0 Reversed 1.2 63-56 Y0 Cr0 Y1 Cb0 Y2 Cr1 Y3 Cb1 Offset of L1 Display Address When the capture image is displayed, the read operations always progress in the direction of increasing addresses. In order to display the image horizontally reversed, it is necessary to specify the offset value based on the right side edge. A pixel where the given offset is subtracted is assumed to be the left edge (head) of the screen for display and pixels are displayed in the order of increasing addresses. The offset value is specified in the CAOFS (Capture Address Offset) field of L1 extended mode register (L1EM). 4 assumed left edge CBOA' raster scan of display ( address increment ) CAOFS Stride=64L1W 64L1W(byte) CBLA' Display of H-reversed image In this example it is assumed that the stride is 1024byte (512pixel). If the address of the left edge of the first raster in the capture buffer is 0, the address of the right edge becomes 0x3F8. In this case, if CAOFS=0x3F8 is given, the left edge of the capture buffer corresponds to the left edge of the display. L1EM (L1-layer Extended Mode) Register address Bit number Bit field name R/W Initial value DisplayBaseAddress + 120h 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 . 4 L1EC Resv L1YCF Resv VMAG L1PB Reserve Reserve CAOFS R/W R0 R/W R0 R/W R/W R0 R/W R0 R/W 0 0 0 0 0 0 0 0 0 0 3 2 1 0 R0 Bit12-0 Bit23-20 L1PB (L1-layer Pallet Base ) Set the value added to the index when subtracting palette of L1 layer. 16 times of setting value is added. Bit25-24 VMAG (Video Magnify) The scaling up of the capture image is specified. 00 Up scaling function is not used 01 Reserved 10 Up scaling function is used 11 Reserved Bit28 L1YCF (L1-layer YC full amplitude) The conversion coefficient when the data of the YcbCr form is displayed by RGB is selected. 0 With amplitude limitation (ITU-RBT.656) 1 Without amplitude limitation (JPEG) Bit31-30 1.3 CAOFS (Capture Offset ) In order to reverse the capture image horizontally, the offset value is specified. Specify zero if horizontally reverse is not used. L1EC (L1-layer Extended Color mode) Sets extended color mode for L1 layer 00 Mode determined by L1C 01 Direct color (24 bits/pixel) mode 1x Reserved Special Setting for YCbCr to RGB Conversion If the video input to be reversed is captured in YCbCr mode, and then converted to RGB, bit CSW (bit 12) of the CBM register must be set to 1. Otherwise the reversed output could show undesired effects. Please refer to the Hardware Manual for more information on the CBM register. 5