Channel interface circuit providing virtual channel number trans

Details Channel interface circuit providing virtual channel number trans Channel interface circuit providing virtual channel number trans

1981-06-22

1983-12-06

Nusbaum, Mark E.

Boots, shoes, and leggings

G06F 300

Patent

active

044197284

ABSTRACT:
The subject channel interface circuit functions to provide a high speed interface between a processor and a data link, which link carries data messages having virtual addresses. The message handler is programmable and serves to translate the header portion of the data message from a virtual address into a hardware memory address, which is used to activate a specific location in the processor memory. The data portion of the data message is then directly inputted to this memory location (i.e., DMA) and the appropriate file pointers are reset. When a complete file is received and stored in memory, the message handler generates a processor interrupt.
Thus, the subject message handler performs all the data receiving tasks, including file storage and linking, without requiring the involvement of the associated processor. All known prior art message handler circuits require extensive processor involvement in the data storage operation and thereby significantly reduce the effective data transfer capabilities of the link.

REFERENCES:
patent: 3588831 (1971-06-01), Figueroa et al.
patent: 4092715 (1978-05-01), Scriver
patent: 4093981 (1978-06-01), McAllister et al.
patent: 4133030 (1979-01-01), Huettner et al.
patent: 4155119 (1979-05-01), De Ward et al.
patent: 4156907 (1979-05-01), Rawlings et al.
patent: 4189769 (1980-02-01), Cook et al.
patent: 4225919 (1980-09-01), Kyu et al.
patent: 4228496 (1980-10-01), Katzman et al.
Electronic Design 12, Jun. 7, 1979, "Data Communications Part Three," pp. 98-104, Alan J. Weissberger.

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