my interpretation was each dq was 2 bits (0,1,2,3), so 16dqs consume 4 bytes of space
Rkddr: a rockchip ddr editor
I don’t understand. There are 16 dq (0-15) on one channel. If you encode each dq pin with two bits, there are only 4 states (dq0-dq3), how do you encode the remaining 12 (dq4-dq15)? How do you reassign, for example,
dq0 to dq12
dq1 to dq5
dq2 to dq15
…
if you look at lp2 and lp3 dq config, it is exactly as you said, but for ddr4 it is different, i am not sure if CS is somehow relevant or ddr4 is split in X4 mode for each dq, btw according to the config i think there are 32 dqs for ddr4 not 16 (may be for each channel 16?). just to make things more confusing 