DDR Read Timing

[hioyo]

Dear Team,

I was learning about DDR read timings.I can see that 4 groups of data I send.Please see the red box.
May I know why they are doing like that.

Regards
HARI

 

[FvM]

Dynamic RAM is read in bursts, multiple data words with consecutive addresses are output after a read command. Burst length of newer DDR RAM is 4 or 8. Burst operation achieves a higher throughput considering the command duration. Multiple bursts can be executed continuously, next read command is scheduled during data output.