FT2232H in FT245 FIFO Mode - burst not working

Thomas L. (thomers) OP 2011-07-07 17:20 #2255991

Hi!

I am trying to burst data out of my Cyclone II via a FTDI FT2232H -Chip 
in FT245 FIFO mode (see FT245_fifo.png) as described in the FTDI 
Application Node 130 (see burst.png):

A write operation can be started when TXE# is low. WR# is brought low when the data is valid. 
A burst operation can be done on every clock providing TXE# is still low. The external system must monitor TXE# and its own WR# to check that data has been accepted. 
Both TXE# and WR# must be low for data to be accepted.


Debugging my design shows me, that the signal sequences fit the 
desciption (see ft232_burst.png), but I only receive 1 byte at the PC 
side, in fact the last one that is on the bus before WR# goes high (or 
WR_int low).

What am I doing wrong? Am i missing simething?

Cheers

Thomers

Attached files:

burst.PNG (94 KB)
ft232_burst.PNG (6 KB)
FT245_fifo.PNG (32 KB)

Reply Quote Edit Move Thread sperren Slow mode Anmeldepflicht aktivieren Anpinnen Delete topic Thread mit anderem zusammenführen Report Thanks

eeprom Guest 2011-07-10 18:22 #2259304

Did u set the 245 mode?
You have to have an external eeprom connected to the 232H and this 
eeprom must be programmed using the FTDI tools provided (the download 
page is a mess and afaik there is only a windows exe)

Reply Quote Edit Delete Report Thanks

eeprom Guest 2011-07-10 18:23 #2259306

o i didnt see the picture. no clue then

Reply Quote Edit Delete Report Thanks

Thomas L. (thomers) OP 2011-07-11 07:34 #2259755

yeah, the FTDI support is looking into it but has no clue yet as well.

does anyone have a working example/design that can actually burst data 
through the ft2232h?

Reply Quote Edit Delete Report Thanks

steffen Guest 2011-07-21 02:33 #2273376

Hi Thomas,

I hope the topic is still active. Two things

1. OpenCores has an example for the Cyclon II with the FIFO
2. Did you set the FIFO mode in both Mode section in the EEPROM? Can you 
see the 60 MHz Clock? If yes then you are in the sync FIFO mode-

Steffen

Reply Quote Edit Delete Report Thanks

Watch this topic

Reply

A question of your own? This thread is over 15 years old. Ask it in a thread of its own – more people read along there, and it gets answered more often and sooner.

Start a new thread

A fix, an addition or feedback on this thread? Then reply here.

Text *

Formatting

[c]C-Code[/c]
[vhdl]VHDL-Code[/vhdl]
[code]code in other languages, ASCII drawings[/code]
[math]formula (LaTeX syntax)[/math]
[[Title]] – link to an article
Link to another post: right-click its post ID (#8078628), copy the address, paste it into the text

More about formatting

Attachments

Post long source code as an attachment, not in the text.

Your name and e-mail address

Already registered? Log in

First name *

Email address *

Not shown to anyone. We send you a link; your post appears once you confirm it there.

Watch this topic

By submitting you create a free account and accept the terms of use.