# TLAST signal not synthesized!

**URL:** <https://discuss.pynq.io/t/tlast-signal-not-synthesized/3420>\
**Category:** Support\
**Created:** [December 11, 2021, 12:19pm UTC](https://discuss.pynq.io/t/tlast-signal-not-synthesized/3420 "2021-12-11T12:19:49Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![Yousef\_Alnaser](https://sea1.discourse-cdn.com/flex019/user_avatar/discuss.pynq.io/yousef_alnaser/32/2620_2.png) [@Yousef\_Alnaser](https://discuss.pynq.io/u/Yousef_Alnaser)\
**Post date:** [December 12, 2021, 11:50am UTC](https://discuss.pynq.io/t/tlast-signal-not-synthesized/3420/3 "2021-12-12T11:50:01Z")

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Hello @marioruiz,

Well, I was looking through these links: [from stackoverflow](https://stackoverflow.com/questions/38264547/axi4-streaming-interface-how-to-manage-floating-point-array-in-hls-for-generati) and [from this website](https://discuss.pynq.io/t/implementing-convolution-beginner-questions/2701/6), and I have many more which all say it could happen.

Maybe I’m missing something or maybe it is changed? using ap\_axis, I have to convert to/from float each time i write/read, right?

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