[From QnA]W7200

Question

Hi I’d like to use W7200 in my new project i have two questions …! with this chip (w5200 + stm32f103cb) how much i can get throughput ?? in datasheet wrote that 80mbps is max … stm32f103 spi1 has 36MHz max clock speed … i’d like to use tcp/ip socket continuous connection… now with this microcontroller + w5200 in best condition, how much speed i can get ??? not very precise , please tell me approximate. MAC address of this chip is unique ?? (Factory written MAC) i know that it’s programmable… but i want sure that chip in network not conflict ! best regards

hjjeon0608 · Answer

Dear customer, Thanks for your interest w7200. A1) Stm32f103c8 max spi clock has 36MHz but W5200 max spi clock is 25MHz. Actually, the operation spi speed is 18MHz. When spi speed is 18MHz, transmission speed measure value is 1.2MHz.(loopback test) A2) The MAC of W7200 is alterable. But this area(in the flash area) have to modify. You have to modify the firmware(for modified MAC) thanks, Wiznet

hjjeon0608 · Answer

“When spi speed is 18MHz, transmission speed measure value is 1.2MHz.(loopback test)” 1.2MHz mean 1.2 Mbps ???!! if yes this is very slow ! in W5100E01-AVR with 8MHz Osc & SPI clk + W5100 → 6Mbps ! now, with Stm32 (Cortex ARM) + 18MHz spi clk + W5200 → 1.2Mbps !!! Is that 1.2 Mbps or 1.2 MB/s ? In fact, i need about 10Mbps speed . Is it possible ?? best regards

hjjeon0608 · Answer

Dear customer, Thanks for your interest in w7200. You’re right, 1.2MHz mean 1.2Mbps. I have tested about performance test both W5100E01-AVR and W5200E01-M3. In case of two-way communication,This is shown in the picture below. If you use 10Mbps speed, you have to use MCU or DSP more than spi speed 50MHz with W5200. Therefore, W7200 can’t use in 10Mbps speed. By the way, where did you confirm speed of W5100?(6Mbps??) Thanks, WIZnet