FT245BM problem: missing/corrupt data

abduln · 2005-10-21T21:39:14+00:00

Hello,We are facing a corrupt/missing data problem with FT245BM:If the "pull down on USB suspend" option is enabled in EEPROM, onstartup, we get 126 bytes of garbage followed by the first byte fromhost. Subsequent bytes come across fine.If the "pull down on USB suspend" option is NOT enabled in EEPROM, thefirst byte from host is never received. Subsequent bytes come acrossfine.The algorithm we are using to read is the following:1. Wait for RXF to go low2. Set RD low3. Wait for 200ns4. Read data5. Set RD high- FT245BM connected to ATmega16- Configured as bus powered device (100mA)- VCC for the ATmega64 is switched using MICREL 2025-2BM power switch.Same as Fig 11 (Page 21) on the datasheet but with power switch ICinstead of MOSFET. Any workarounds, debugging tips?Thanks,Abdul

Oct 21, 2005 21 Replies

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Stef Mientki 20 years ago

I'm interested in your design, which I suppose can be modified to the FT232BM, which suffers from the sae problems.

Stef Mientki

jyar> The FTDI system is extremely sensitive and injecting a simple 4vpp 500ns

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jyaron 20 years ago

your email was bounced email me and I'll reply with info

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