What are the differences between dual-port and 2-port SRAMs?

[bharundi]

I recently heard a usage of dual-port and 2-port SRAM terms, but I wasn't quite sure about the differences. My impression had been that both are same, and the terms are used interchangeably. But, now I am thinking it's not true. I would appreciate any clarification anyone can provide on this. Further, please also provide any documentation (i.e. slides, datasheets, etc.) you may have to further clarify the topic. Thanks!

 

[HTA]

I think it is in principle the same but used as different expressions on the chip-level design (Two Port SRAM) and the component level design (Dual Port SRAM). Here a paper talking about two ports for video application: https://www28.cs.kobe-u.ac.jp/~kawapy/publications/ISVLSI07NPSRAM.pdf . The basic function is always to access a memory from both sides. Since it is only one memory cell you have to solve the conflict of simultaneous read/write case through arbitration logic.

 

[rca]

Some memories have two ports but one only for reading and the second only for writings.
Some memories have two ports which could used for reading and writing.