General Category > Discussion - Hardware

txe and rxe signals in FT232H

(1/1)

Rajesh@sys:
hi,

RXE and TXE signals are dependent or independent ?


                can TXE and RXE go LOW at same time.

FTDI Community:
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

Rajesh@sys:
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 ?

FTDI Community:
Hello,

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

Best Regards,
FTDI Community

Rajesh@sys:
Thank you  :)

Navigation

[0] Message Index