System for transferring data between main computer multiport mem

Details System for transferring data between main computer multiport mem System for transferring data between main computer multiport mem

1997-09-24

1999-05-04

Lee, Thomas C.

Electrical computers and digital processing systems: memory

Storage accessing and control

Hierarchical memories

395827, 395848, 711100, 711147, 711149, 711152, G06F 1216, G06F 1214

Patent

active

059013281

ABSTRACT:
A memory protection setting unit sets a protection area in a multiport memory provided with two ports, that is, port A and port B. The CPU accesses the multiport memory through port A. At this time, an area other than the protection area can be accessed. The CPU transmits data to an external device through a transfer control device. The transfer control device accesses the multiport memory through port B. Only the protection area can be accessed at this time. Upon receipt of a request from the CPU, the transfer control device writes data received from the external device to the protection area and reads data to be sent to the external device from the protection area. Protection is removed by the memory protection setting unit from the protection area where data is read or written by the transfer control device.

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