SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
The write port is used to write pixels to memory after the data have passed through the storage formatter. Data storage to SDRAM is controlled by the ISIF_SYNCEN[1] DWEN bit. The ISIF allows writing the data as 16, 12, and 8 bpp. The bit width is controlled by the ISIF_CCDCFG[1:0] SDRPACK bit field.
The write port generates a burst of 32 bytes on the MTC interface. The delay between consecutive bursts is proportional to the input pixel clock. Hence, the write port does not request peak bandwidth traffic.
Table 9-217 lists the estimated delay between 32-byte MTC requests for different pixel clock frequencies and assumes the L3_MAIN clock is 212.8 MHz.
Pixel Clock | Maximum Bandwidth 2 Bytes/s Pixel MB/s | Expected Delay Between MTC Requests |
---|---|---|
212.8 | 400 | 16 cycles = 80 ns |
100 | 200 | 32 cycles = 160 ns |
10 | 20 | 320 cycles = 1600 ns |