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AM6442: DDRConfig of the SysConfig tool

Kanae
Guru 10105 points
Part Number: AM6442
Other Parts Discussed in Thread: SYSCONFIG

Hi Support Team,

Please let me check the DDR Subsystem (AM64x-DDRConfig) of the SysConfig tool.

dev.ti.com/.../ Fproduct.json%20--device%20AM64x_beta%20--part%20Default%20--package%20ALV%20--theme%20light

The unit of the input item tXPR in the DRAM Timing B is [tCK].
The unit of tXPR is [tCK], but the unit of tXPR is [ns] in the data sheet of the DDR used.

Q1. Is there any problem with the following unit conversion (calculation) method?

tXPR[ns]=>[tCK].
tXPR[tCK] = tXPR[ns] / tCK(AVG)[ns]

Calculation example)
DDR4-1600 (tCK(AVG)=1.25ns)
tXPR[tCK] = 360[ns] / 1.25[ns] = 288[tCK].

Q2. Is tXPR=288[tCK] an appropriate number?
I would like to make sure this because the initial value of SysConfig is 5[tCK],
which is smaller than the calculated value.)

Reference: DDR4 datasheet (p.368, tXPR[ns])
media-www.micron.com/.../8gb_ddr4_sdram.pdf 57b6726071152f1384

Best regards,
Kanae

  • 0
    TI__Guru* 88000 points

    Kanae, the calculation is not necessary.  Check note 5 on page 40 of the datasheet.  It shows  (tXPR = MAX (tXS, 5 * tCK).  The SysConfig tool will automatically calculate tXPR _ns as tXS+10, so all you need to input is tXPR_tCK as 5.  The result of the equation will be 288tCK as you have figured out, but the tool will perform the calculation

    Regards,

    James