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Open Rex - DDR3 Memory Address
justaelvis , 08-13-2018, 05:02 AM
Hi Robert,
I wonder why open rex use all 16 address lines for DDR3 interface, cause as I read in Micron 4Gb DDR3 Addressing it said for 256Mx16 row addressing is A[14:0] and column addressing is A[9:0].
And why the termination resistor of address, command and control is 47 ohm.
Thank you!
robertferanec , 08-14-2018, 05:17 AM
I wonder why open rex use all 16 address lines for DDR3 interface, cause as I read in Micron 4Gb DDR3 Addressing it said for 256Mx16 row addressing is A[14:0] and column addressing is A[9:0].
- It is there to support 8Gb memory chips:
http://www.voipac.com/#iMX6-SBC-532441111And why the termination resistor of address, command and control is 47 ohm.
- this was taken from reference schematic
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