Multiport memory and information processing system
In an information processing system, a plurality of information processing devices CHIP 0 and CHIP 1 are connected to multiport memory MPMEM 0 that has a plurality of ports, and memory areas in multiport memory MPMEM 0 can be altered to memory areas occupied by particular ports and memory areas shared by a plurality of ports. At such times, immediately after the occurrence of a request from a port, the status of this request may be supplied from other ports.
1. An information processing system that includes a multiport memory having a plurality of ports and a plurality of information processing devices each connected to an associated one of said plurality of ports of said multiport memory, wherein said multiport memory comprises:
a first control circuit that receives a request through a first port of said plurality of ports;
a memory circuit that performs an operation responsive to said request; and
a second control circuit that supplies, during performing said operation by said memory circuit, a content of said request to a second port of said plurality of ports.
2. The information processing system according to claim 1 , wherein said multiport memory includes a register in which said content of said request supplied from said second port is set.
3. The information processing system according to claim 2 , wherein said register is programmed by a first one of said information processing devices that is connected to said first port.
4. The information processing system according to claim 3 , wherein, in said multiport memory, the content of said register that is programmed from said first port is read by a second one of said information processing devices that is connected to said second port.
5. The information processing system according to claim 2 , wherein said register is further used to be programmed by one of said information processing devices that is connected to said second port.
6. The information processing system according to claim 1 , wherein the content of said request that is supplied from said second port is saved in one of the said information processing devices that is connected to said second port.
7. The information processing system according to claim 1 , wherein said multiport memory has a plurality of memory areas, and each of said plurality of memory areas is programmed with information indicative of whether or not said request from said first port is to be supplied from said second port.
8. The information processing system according to claim 1 , wherein said content of said request supplied from said second port includes time interval information of said request.
9. The information processing system according to claim 1 , wherein said content of said request supplied from said second port includes address information of said request.
10. A multiport memory having a plurality of ports, comprising:
a first control circuit that receives a request through a first port of said plurality of ports;
a memory circuit that performs an operation responsive to said request; and
a second control circuit that supplies, during performing said operation by said memory circuit, a content of said request to a second port of said plurality of ports.
11. The multiport memory according to claim 10 , further comprising a register in which is set said content of said request supplied from said second port.
12. The multiport memory according to claim 11 , wherein said register is programmed by a first information processing device that is connected to said first port.
13. The multiport memory according to claim 12 , wherein said content of said register that is programmed from said first port is read from said second port.
14. The multiport memory according to claim 10 , wherein said register is further used to be programmed by an information processing device that is connected to said second port.
15. The multiport memory according to claim 10 , wherein said content of said request that is supplied from said second port is saved by an information processing device that is connected to said second port.
16. The multiport memory according to claim 10 , wherein said multiport memory has a plurality of memory areas, and each of said plurality of memory areas is programmed with information indicative of whether or not said request from said first port is to be supplied from said second port.
17. The multiport memory according to claim 10 , wherein said content of said request from said second port includes time interval information of said request.
18. The multiport memory according to claim 10 , wherein the content of said request that is supplied from said second port includes address information of said request.