| ??? 03/14/10 01:47 Read: times |
#174122 - where is your head wedged? Responding to: ???'s previous message |
Per Westermark said:
Richard Erlacher said:
USB is of little use because it can't support a fixed-rate data transfer ... even a slow one, without HUGE (2-4 GB) buffer memory on the peripheral side. Not really true. And for simplicity - just fill the FIFO of a UART and keep it running. Or switch to FW for higher bandwidth. A UART won't help with synchronous data. Now ... how would that 12 Mbit burst help with 128 MBytes of data in a single synchronous burst at ~45 Mbps? Where would you get the FIFO? Are you assuming a PC is doing the work? The trick is to figure out the best way to take advantage of the existing tools, instead of blaming them for not being identital to the tools you had access to 20 years ago. What I blame them for is the tremendous waste of time and effort because these purportedly idiot-proof devices seldom work as claimed. Just look at the proportion of USB-to-serial and USB-to-parallel interfaces that fall flat when expected to work as the devices they replaced did. Yes ... I know ... "modern" printers use USB. However, if you have to print a large document, you'll wear out three of them in just that one document, not to mention running out of ink a dozen times per day. They're actually a prime example. The newer ink-spitters cost about $85 dollars, but use $1k of ink per year. Back when things were sane, they cost $1k, but used $50 worth of ink/toner per year. I've had not even one of the "modern" printers survive its first year. That's why they only give you a 90-day warranty. RE |
