| 摘要 |
A modem interface communicates data between a computer and a modem that is coupled to an external communication network. The modem interface includes a host interface for coupling to a host processor of the computer, an analog interface for coupling to the modem, and a digital signal processor for processing the data communicated with the modem and the host processor. A memory is coupled to the host interface, the digital signal processor and the analog interface. The analog interface provides clock signals and converts data between analog and digital for communicating between the memory and the modem. The analog interface provides an interrupt to the digital signal processor to control the transfer of data from the digital signal processor and the memory. The modem interface processes data at sampling rates while the host processor processes data at rates less than the sampling rate of the analog interface. communication between the modem interface and the host processor is driven by an interrupt provided from the host interface to the host processor which services the interrupt. The host processor clears the interrupt by writing to a register in the memory of the modem interface. |
