rise time/fall time for AM3874

Hi Michi,

Do you need to know GPIO signal rise / fall time, GPMC signal rise / fall time or both ?

Especially for GPMC_OE, you can check AM387x datasheet, Figure 8-21. GPMC Non-Multiplexed NOR Flash - Synchronous Single Read (GPMCFCLKDIVIDER = 0). It looks to me, that the GPMC_OE rise/fall is marked as 11 and 12. For 11 and 12 timing, you can check Table 8-33. Switching Characteristics Over Recommended Operating Conditions for GPMC/NOR Flash Interface - Synchronous Mode. For example:

11 td(CLKH-nOE) Delay time, GPMC_CLK rising edge to GPMC_OE_RE transition  MIN H - 3⁽⁸⁾ ns ; MAX H + 5⁽⁸⁾ ns

(8) For OE falling edge (OE activated) / IO DIR rising edge (IN direction) :
• Case GpmcFCLKDivider = 0:
H = 0.5 * OEExtraDelay * GPMC_FCLK
• Case GpmcFCLKDivider = 1:
......
For OE rising edge (OE deactivated):
• Case GpmcFCLKDivider = 0:
H = 0.5 * OEExtraDelay * GPMC_FCLK
• Case GpmcFCLKDivider = 1:
....
 
Depending on which case you are, you can check also figures 8-22, 8-24, 8-25.

Use similar approach for all the rest GPMC signals timing.

Regards,

Pavel

Pavel-san,

Thank you for your reply.

You advised me GPMC_OE rise / fall time is marked No.11,12 on Figure 8-21. But I don't think it is rise/fall time.

No.11 is "Delay time (GPMC_CLK rising edge to *GPMC_OE_RE transition)",

My understanding of rise/fall time is the following.

I would like to know rise time/fall time of the above difinition for GPMC signal.

Please let me know.

Best regards,

Michi

Hello TI Support,

We are also looking for this information,

Datasheet specifies Rise/Fall times for GPMC_CLK and GPMC_AD in table 7-22 of AM3358 Datasheet.  We are looking for information on GPMC_ADVn/OE/WE/CS

Could someone please provide more details?

Thanks,

Mikhail