Epson EPL-N1200 Service Manual - Page 82
Video Interface
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EPL-N1200 Service Manual Operating Principles 2.2.1.7 Video Interface The ASIC E05B17 (IC16) maps the SRAM into a different memory space from system memory. The CPU transmits data from the V-RAM (in the system RAM) to the SRAM using the ASIC E05B17. The ASIC cell converts the image data in the SRAM from parallel to serial, synchronizes it, and then transmits it to the engine controller board. In other words, the SRAM is a temporary buffer used to transmit the image data to the engine controller board. This serial image data creates VIDEO signal of video interface. The signal line of the internal video interface circuit (the C205 MAIN board and engine controller board) can be broadly divided into four groups. The first group (PRINT, CPRDY, EPRDY, and PRDY) gives the status of either the video controller or engine controller and indicates whether they are ready to communicate with each other or ready to start the printing operation. The second group (VSYNC, HSYNC) is the synchronizing signal for the printing operation. The third group (VIDEO) is the serial video data signal. The fourth group (CMD, SRCLK, CTBSY, and ETBSY) is used to transfer the commands (from the video controller) or status (from the engine controller) for printer mechanism control. Except for VIDEO, PRINT, VSINC, and HSYNC, all signals are controlled by ASIC E05A93. This printer has BiRITech function standard. These functions modify the VIDEO signal with the ASIC E05B17 (IC16). Rev. A 2-23