#1 Oct. 31, 2012 08:36:06

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Bit-Rate CC3000-SL

Hi, I 'm new with CC3000, just few days ago I bought the CC3000 wifi module with LM4F232 board (by Texas Instruments). Now the module is functioning very well and transmits data (to a router) at about 1 Mbit/sec but I would to increase at 54 Mbit/sec, as declared in the datasheet. How it it possible to do it? Which settings should I modify? Thank you for the kind reply, Alessandro Magnani

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#2 Oct. 31, 2012 08:36:06

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Bit-Rate CC3000-SL

Hello Alessandro, With WiFi it is almost impossible to achieve the total RF phy rate of 54Mbps due to packet spacing and protocol overhead. The TiWi-SL is only capable of around 5 Mbps. Details on the throughput for the TiWi-SL can be found in the datasheet. See this [url=http://www.wifihowto.net/wifi-speeds-vs-real-world-throughput]article[/url]. It has a good explination of WiFi speeds. Regards, Ryan

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#3 Oct. 31, 2012 08:36:06

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Bit-Rate CC3000-SL

Thank you for your attenction. So I have two different questions: 1) We driven the RF module with an SPI clock of 15 MHz (16 Mhz is the maximum clock). Which is the real bit-rate in that conditions? 15 Mbit/s? 5 Mbit/s? In other words, what happens if the RF module is driven with an SPI clock greater than the maximum bit-rate? Some data is discarted? Or appended? 2) If my RF module supports 'b '/ 'g ' standards (see datasheet), why you told of about 5Mbit/s when the article indicates about 25-30 Mbit/s (in case 'g ')? Regards, Alessandro Magnani

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#4 Oct. 31, 2012 08:36:06

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Bit-Rate CC3000-SL

Hello Alessandro, 1) The SPI interface will not work if you drive it faster than 16MHz. 2) Because the TiWI-SL has an SPI interface it is not able to achieve 25-30 Mbps of throughput. The TiWi-SL is only able to achieve around 5 Mbps because of limitations internal to the CC3000. Regards, Ryan

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#5 Oct. 31, 2012 08:36:06

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Bit-Rate CC3000-SL

Ok, but what happen to the data if the SPI clock is greater than 5 MHz? If I pass continuous data to the RF module at a rate of 15 MHz (for example), does the module discart some one? It can 't append them because the module has finite memory... We tried to drive the RF module at 15 MHz and the data are correctly trasmitted. But I don 't belive that all the packets are been sent because the wifi bit-rate is lower than the input throughput. Is it correct this opinion? Thank you, Alessandro Magnani

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#6 Oct. 31, 2012 08:36:06

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Bit-Rate CC3000-SL

If you send data to the module at faster than 5Mhz it will receive and send out all data. No packets will be dropped.

Edited (Oct. 31, 2012 08:36:06)

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