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boards:ecb:usb-fifo:start [2017/03/24 11:35]
will [Notes on Construction]
boards:ecb:usb-fifo:start [2017/03/26 16:59] (current)
will [Example Code]
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 |U5|74LS38|TI SN74LS38N (Farnell order code 1470758)| |U5|74LS38|TI SN74LS38N (Farnell order code 1470758)|
 |U6|74AHCT139 (preferred) or 74LS139A|TI SN74AHCT139N (Farnell order code 1741539)| |U6|74AHCT139 (preferred) or 74LS139A|TI SN74AHCT139N (Farnell order code 1741539)|
-|U7, U11|74ACT32 (preferred) or 74LS32|TI SN74ACT32N (Farnell order code 1739969) or TI SN74LS32N (Farnell order code 1740030)|+|U7, U11|74ACT32 (preferred), 74AHCT32 (untested but should work) or 74LS32|TI SN74ACT32N (Farnell order code 1739969), TI SN74AHCT32N (Farnell order code 1749941) or TI SN74LS32N (Farnell order code 1740030)|
 |U8|74LS175|TI SN74LS175N (Farnell order code 1607731)| |U8|74LS175|TI SN74LS175N (Farnell order code 1607731)|
 |U10|Adafruit FT232H Breakout (product 2264)|Mouser order code 485-2264, Digikey order code 1528-1449-ND| |U10|Adafruit FT232H Breakout (product 2264)|Mouser order code 485-2264, Digikey order code 1528-1449-ND|
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 |(qty 2)|16 pin DIP IC socket|TE Connectivity 1-2199298-4 (Farnell order code 2445622)| |(qty 2)|16 pin DIP IC socket|TE Connectivity 1-2199298-4 (Farnell order code 2445622)|
 |(qty 3)|14 pin DIP IC socket|TE Connectivity 1-2199298-3 (Farnell order code 2445621)| |(qty 3)|14 pin DIP IC socket|TE Connectivity 1-2199298-3 (Farnell order code 2445621)|
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 +\\
 +
  
 ===== Notes on Construction ===== ===== Notes on Construction =====
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 </​code>​ </​code>​
  
-Untested idea: For writes up to 512 bytes in length, ​believe you could signal ​Send Immediate, then poll for the RX_EMPTY bitand then proceed to load up to 512 bytes into the transmit FIFO without checking the RX_EMPTY bit again (using the OTIR instruction,​ or an unrolled loop of OUTIs). I believe the 1KB FIFO in the FT232H is divided into two 512-byte buffers and one is loaded with data while the other is transferred over USB, so once any space in the buffer becomes available ​you can be confident there is at least 512 bytes of space available. Again, this is untested, but could allow for very fast transmission. +also have file transfer application ​for CP/MFIFOPIPE. Drop me an email (will /at/ sowerbutts.comif you'd like to try it out.
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boards/ecb/usb-fifo/start.1490369756.txt.gz · Last modified: 2017/03/24 11:35 by will
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