topic Re: drive strength in i.MX Processors

drive strength

geethar — Wed, 09 Jul 2014 07:06:22 GMT

How to change the drive strength of mobile DDR?

Re: drive strength

Yuri — Wed, 09 Jul 2014 07:33:06 GMT

Please use DDR Mode registers (Extended Mode Register) to configure DDR

Output Drive Strength during DDR initialization.

Have a great day,
Yuri

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Re: drive strength

geethar — Wed, 09 Jul 2014 09:25:37 GMT

How can i access the mobile DDR mode register and extended mode register address?

How to set mode register in DDR?

Re: drive strength

Yuri — Thu, 10 Jul 2014 01:33:32 GMT

What is modile DDR (part number, Datasheet) ?

Re: drive strength

geethar — Thu, 10 Jul 2014 05:52:38 GMT

part number for my micron mobile ddr is MT46H32M16LFBF-6 IT:C

Re: drive strength

Yuri — Fri, 11 Jul 2014 08:30:40 GMT

According to the MT46H32M16LFBF Datasheet, Extended Mode Register (EMR)

controls in particular drive strength. The EMR is programmed via the LOAD MODE REGISTER
command with BA0 = 0 and BA1 = 1. EMR bits 5,6,7 define memory drive strength.

< http://www.micron.com/~/media/Documents/Products/Data%20Sheet/DRAM/Mobile%20DRAM/Low-Power%20DRAM/LPDDR/60-series/t67m_512mb_embedded_lpddr.pdf >

IMX23 provides EMR writing via setting bit field HW_DRAM_CTL38 [EMRS1_DATA] and

setting HW_DRAM_CTL09 [ WRITE_MODEREG ].

Have a great day,
Yuri