IMX28CEC datasheet(20/70 Pages) FREESCALE

20 / 70 page

i.MX28 Applications Processors Data Sheet for Consumer Products, Rev. 1

Freescale Semiconductor

3.3.1

DDR I/O DC Parameters

Table 23 shows the EMI digital pin DC characteristics.

NOTE

The current values and the I-V curves of the I/O DC characteristics are

estimated based on an overly conservative device model. They are updated

upon the measurement results of the first silicon.

Table 24 shows the ON impedance of EMI drivers for different drive strengths.

Table 23. EMI Digital Pin DC Characteristics

Parameter

Symbol

Min.

Max.

Units

Input voltage high (dc)

VIH

VREF + 0.125

VDDIO_EMI + 0.3

Input voltage low (dc)

VIL

0.3

VREF – 0.125

Output voltage high (dc)

VOH

0.8 * VDDIO_EMI

—

Output voltage low (dc)

VOL

0.2 * VDDIO_EMI

Output source current (dc)

LVDDR2 Mode

IOH1—Low

1 IOH is the output current at which the VOH specification is met.

TBD

IOH—Medium

TBD

IOH—High

TBD

Output sink current (dc)

LVDDR2 Mode

IOL2—Low

2 IOL is the output current at which the VOL specification is met.

TBD

IOL—Medium

TBD

IOL—High

TBD

Output source current (dc)

mDDR, DDR2 Mode

IOH—Low

TBD

IOH—Medium

TBD

IOH—High

TBD

Output sink current (dc)

mDDR, DDR2 Mode

IOL—Low

TBD

IOL—Medium

TBD

IOL—High

TBD

Table 24. ON Impedance of EMI Drivers for Different Drive Strengths

Mode

Drive

Min. (

Ω)Typ. (Ω)Max. (Ω)

1.5

LVDDR2

Low

TBD

Medium

TBD

High

TBD

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