EPROM and EEPROM Programmers

On 30 Apr 2012 at 14:06, Richard wrote: Okay (although this could have been resolved with a simple lookup on USB protocol). The third term should be obvious. Data can flow in only one direction at any given time over the interface. USB 3.0 uses a pair of connectors to get around this, but I'm not aware of any USB 3.0 full-duplex EPROM programmers. "Asymmetric" refers to adherence to a master-slave topology; a member on the bus is either a controller or a slave. What ties this with "polled nature" is that there is no way for a slave to initiate a transfer--all conversations are initiated by the controller. In other words, conversation between slave and controller is "speak only when spoken to". Thus, to determine the status of an operation, the host must periodically poll the slave asking "Is it soup yet?". I hope this clears things up. --Chuck