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Author Topic: txe and rxe signals in FT232H  (Read 11032 times)

Rajesh@sys

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txe and rxe signals in FT232H
« on: March 15, 2019, 01:27:33 PM »

hi,

RXE and TXE signals are dependent or independent ?


                can TXE and RXE go LOW at same time.
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Re: txe and rxe signals in FT232H
« Reply #1 on: March 19, 2019, 08:59:38 AM »

Hello,

Do you mean RXF# and TXE#?

RXF#:
When high, do not read data from the FIFO. When low, there is data available in the FIFO which can be read by driving RD# low. When in synchronous mode, data is transferred on every clock that RXF# and RD# are both low. Note that the OE# pin must be driven low at least 1 clock period before asserting RD# low.

TXE#:
When high, do not write data into the FIFO. When low, data can be written into the FIFO by driving WR# low. When in synchronous mode, data is transferred on every clock that TXE# and WR# are both low.

A write operation can be started when TXE# is low.

A read operation is started when the chip drives RXF# low.

Best Regards,
FTDI Community
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Rajesh@sys

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Re: txe and rxe signals in FT232H
« Reply #2 on: March 19, 2019, 10:33:14 AM »

thank you very much for your reply.

<RXF#:
When high, do not read data from the FIFO. When low, there is data available in the FIFO which can be read by driving RD# low. When in synchronous mode, data is transferred on every clock that RXF# and RD# are both low. Note that the OE# pin must be driven low at least 1 clock period before asserting RD# low.

TXE#:
When high, do not write data into the FIFO. When low, data can be written into the FIFO by driving WR# low. When in synchronous mode, data is transferred on every clock that TXE# and WR# are both low.

A write operation can be started when TXE# is low.

A read operation is started when the chip drives RXF# low. >




i know this one.


are they independent ??


can we perform READ and WRITE at same time ?
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Re: txe and rxe signals in FT232H
« Reply #3 on: March 20, 2019, 04:31:36 PM »

Hello,

This is not possible because D0 to D7 bidirectional FIFO data are used for both read and write operations.

Best Regards,
FTDI Community
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Rajesh@sys

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Re: txe and rxe signals in FT232H
« Reply #4 on: April 27, 2019, 06:09:28 AM »

Thank you  :)
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