SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
The maximum output pixel clock on both resizers is 532 MHz (OPP_HIGH); that is, a pixel throughput of 532 MPix/s. Moreover, hardware takes care of the following constraints:
For example, if a 4x upscale ratio happens horizontally and vertically, then the input pixel clock must be lower than 532/(4 × 4) = 66.5 MHz.
It is the reason why it is not possible to perform digital zoom upscaling on the fly. It is necessary to acquire the pixels to memory first and to read them back at a pace that does not exceed the previously discussed constraints. At the ISS level, data can be read back from memory by the CAL_B or ISIF module.