| ??? 09/03/06 16:40 Read: times |
#123603 - Not real magic Responding to: ???'s previous message |
Jez Smith said:
Very simply:-
Flash drives are designed to behave in the same way as an external hard disk drive and internally the controller addresses the flash as if it was a standard hard disk.The usb interface is simply a high speed serial interface so the pc sends a command to read or write a file from the flash over the usb interface, the internal controller converts the request into read/write commmands for the flash which fetches/stores the data which is sent over the usb interface and Bob's your uncle. There is a lot more magic involved obviously but the thing which allows it to work efficiently is the design of the physical signalling which goes on over the interface and allows data to b sent at a fairly high bit rate without too much hassle, which is acheived by a differencial voltage driver over two wires which act as two halves of a signal thereby eliminating a lot of problems with cross talk and noise. Thanks for your answer Jez. The above information I already found on the internet. I was wondering what chips were inside the flash usb drive to perform the above magic. Their must be some information for one of the usb companies that make these usb flash drives. By the way you stated much better then most examples of usb flash drive operation on the internet. Is it possible you could give exmaple if you did it with avaiable hardware chips of some type. Before these chips become magic some programmer or engineer makes some type of block diagram to show what the magic will do when complete. That's the part I am interested in as an example. Say company xyz told their head engineer create black box that you plug into usb port that would store information from the computer to black box and take information from the black box. Could you give example of this. Best reguards, Ralph Sack |
| Topic | Author | Date |
| USB Flash Drive How does it work | 01/01/70 00:00 | |
| Magic again | 01/01/70 00:00 | |
| Not real magic | 01/01/70 00:00 | |
| have a look at this: | 01/01/70 00:00 | |
| you even get a kit to play with | 01/01/70 00:00 | |
| At the top of this page | 01/01/70 00:00 | |
| Very impressive | 01/01/70 00:00 | |
| Here's an application note example | 01/01/70 00:00 | |
| Very complex | 01/01/70 00:00 | |
| Mass storage | 01/01/70 00:00 | |
| You are right Andy | 01/01/70 00:00 | |
Its only the funny ones we make fun of... | 01/01/70 00:00 |