1.Introduction of parallel SRAM chip
In industrial control,image processing,communication base station and other fields that require strict real-time,the reading and writing speed of memory often directly determines the response upper limit of the whole system.Unlike DRAM,SRAM is a"static"memory,which can keep data for a long time as long as power is supplied,without periodic refresh operation.With its unique interface architecture and nanosecond access capability,parallel SRAM has become a common choice for high-performance embedded schemes.
2.Characteristics of parallel SRAM memory
The most prominent feature of parallel SRAM is"fast".Its read-write delay can usually be as low as 10ns or even shorter,which means that after the processor sends out the read instruction,it can get the data almost without waiting.This speed is enough to directly connect with the clock cycle of the mainstream CPU core,without inserting the waiting cycle.In contrast,ordinary serial Flash or EEPROM often needs microsecond response time,and the difference is two orders of magnitude.
3.Performance of parallel SRAM memory
The interface of parallel SRAM chip adopts multi-bit data lines to transmit at the same time(common×8,×16 or×32 bits),and the data exchange of multiple bits can be completed in one reading and writing operation.However,even if the frequency of serial interface is higher,it is still bit-by-bit transport in essence.In the actual burst transmission scenario,the throughput of parallel SRAM can be 5-8 times higher than that of serial scheme.Taking real-time image processing as an example,each frame of pixel data needs to be cached and transported in a very short time-the high bandwidth of parallel SRAM just meets this kind of scene,which saves the extra delay and power consumption caused by serial-parallel conversion circuit.
Of course,parallel SRAM also has its own shortcomings:the unit capacity cost is higher than that of DRAM,and the single chip integration is low,generally in the order of several megabits to tens of megabits.Therefore,it is more suitable for small and medium-sized scenes,such as cache,data buffer and lookup table,which pursue extreme speed.If your product needs to deal with high-speed data flow or real-time control,parallel SRAM is still a storage solution worthy of priority.
Keywords:SRAM
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