Abstract: Using pin planning for core sources includes identifying, using a processor, a first pin configuration and a second pin configuration for a core source of a behavioral description of a circuit design. The second pin configuration is generated by a pin planning operation. The first pin configuration of the core source can be compared with the second pin configuration of the core source using a processor. Responsive to detecting a difference between the first pin configuration and the second pin configuration, the core source can be automatically update, using the processor, based upon the second pin configuration.

Abstract: A modem is disclosed having a data transmission protocol involving lower-speed, full-duplex operation during the connect sequence with a remote modem and an automatic switch to higher-speed, half-duplex operation for data transfer. Further, the modem data transmission involves transparently changing between lower-speed, interactive operation and higher-speed operation based upon transmission demands. The operation is controlled by a processor monitoring the contents of a transmit data buffer and providing a mode control command to the modem transmitter. The modem also adapts its speed to the quality of the telephone line by fallback or fallforward to a different speed based upon predetermined data frame retransmission criteria.