| 摘要 |
A modem interface unit is provided for coupling a communications modem to a host processor. The modem interface unit includes a host interface for coupling to a host processor, an anlog interface for coupling to a communications modem and a digital signal processor for performing signal processing operations on modem signals as they are transferred from the host interface to the analog interface and vice versa. A memory is provided for use in moving the modem signals through the interface unit. A sleep mode mechanism is provided for discontinuing the supplying of operating current to the digital signal processor when no modem signals have been transmitted or received for a predetermined period of time.
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