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Discussion - Hardware / Re: FT601 Does not enumerate reliably on power up
« on: October 26, 2022, 10:33:17 am »
Hi,
Thanks. Could you let me know what the input voltage compatibility is for VBUS as well as the high/low switching thresholds? I can't seem to find that information in the data sheet. I am currently using the power enable signal from the hub IC to switch the FT601's VBUS signal on and off. The FT601 does enumerate using this scheme just not reliably. In prior versions of our board we have had VBUS connected to the USB connector on the product as well as to the power enable on the USB5744 (previous USB hub). In all cases the FT601 exhibited the same behaviour.
Regarding the errata: Erratum 0006 & 0007, concerning Clock On In Suspend. The behaviour listed for this errata appears to match what we're seeing. We reprogram the FT601 with our device information. We do this by using the EEPROM hex dump from the FTDI programming utility. Can you tell me which bit(s) in the hex dump enable/disable the previously removed Clock On In Suspend option as well as the bit for Disable Chip Power Down? We would like to confirm that we are not accidently enabling these options when we program the FT601.
Again thanks,
Rich
Thanks. Could you let me know what the input voltage compatibility is for VBUS as well as the high/low switching thresholds? I can't seem to find that information in the data sheet. I am currently using the power enable signal from the hub IC to switch the FT601's VBUS signal on and off. The FT601 does enumerate using this scheme just not reliably. In prior versions of our board we have had VBUS connected to the USB connector on the product as well as to the power enable on the USB5744 (previous USB hub). In all cases the FT601 exhibited the same behaviour.
Regarding the errata: Erratum 0006 & 0007, concerning Clock On In Suspend. The behaviour listed for this errata appears to match what we're seeing. We reprogram the FT601 with our device information. We do this by using the EEPROM hex dump from the FTDI programming utility. Can you tell me which bit(s) in the hex dump enable/disable the previously removed Clock On In Suspend option as well as the bit for Disable Chip Power Down? We would like to confirm that we are not accidently enabling these options when we program the FT601.
Again thanks,
Rich