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Author Topic: How to control ACBUS[8-9] in Sync 245 FIFO?  (Read 9598 times)

gregg

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How to control ACBUS[8-9] in Sync 245 FIFO?
« on: March 24, 2022, 04:33:50 PM »
All datasheets of FT2xx seem to imply that it's possible to control ACBUS8 ACBUS9 in sync 245 FIFO. See attached screenshot of the datasheet table.

I would like to know what is the real possibility of the hardware for ACBUS[8-9] in sync 245 FIFO mode? Is it possible to control those two lines?

From the software point of view with libd2xx, it seems that you can only control those 2 lines with setbitmode in ACBUS bit-bang mode 0x20 while sync 245 FIFO is 0x40 mode.

I'm using my own software and I'm talking directly to the chip with libusb so I'm not bounded by libd2xx. In sync 245 FIFO mode and without interrupting this mode, is it possible to do something with ACBUS[8-9] as it's implied by the datasheets because those lines are listed for the sync mode?
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Re: How to control ACBUS[8-9] in Sync 245 FIFO?
« Reply #1 on: March 25, 2022, 04:46:08 PM »
Hi,

all the CBUS pins are programmable through FT_PROG, https://ftdichip.com/wp-content/uploads/2020/08/AN_124_User_Guide_For_FT_PROG.pdf. Section 2.4 of the FT232H datasheet shows the ACBUS signal options https://ftdichip.com/wp-content/uploads/2020/07/DS_FT232H.pdf.

however, they can only be controlled when the device is in UART mode.

Best Regards,

FTDI Community
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