Comparison between CS brand SD NAND and SPI NAND

We have written an article before to explain CS brand SD NAND And eMMC,TF card ,Raw nand And other products . I'd like to talk to you today CS brand SD NAND And SPI NAND Comparison of .

                                                                       These two products look like twins ：

All are 6*8mm size ,SD NAND yes LGA-8 encapsulation ,SPI NAND yes WSON-8 encapsulation . What are their similarities and differences ？

One ,  The same thing ：

1.1  Internal material

The mainstream basically uses SLC NAND Flash wafer , Erasure life 5~10W Time

1.2  Package size

Mainstream sizes are 6*8mm,8pin foot

Two ,  Difference ：

2.1 The interface is different

SD NAND Normal connection CPU Of SDIO Use , Some platforms also support SD NAND Pick up SPI Interface （ But the reading and writing speed may slow down ）; SPI NAND Pick up SPI Interface , Pick up SDIO Can not be used normally .

2.2 The driver

Basically mainstream CPU The platform comes with it SDIO The driver , therefore SD NAND There is no need for users to write additional drivers ; in addition SD NAND Built in for NAND Flash Of EDC/ECC, Bad block management , Average reading and writing , Garbage collection and other algorithms . in the light of NAND Flash The management of is completely done ; and SPI NAND Mainly for protocol conversion , From parallel port to SPI Interface , Some manufacturers have built-in EDC/ECC Algorithm , But other management mechanisms are not included . As a result, users are using SPI NAND I still need to write the driver .

2.3 Read/write speed

Due to the differences between interfaces and protocols , The speed difference between the two is relatively large .SD NAND Is take the 4-bit Transmission bandwidth , Compared with reading and writing speed SPI NAND Much faster , The maximum write speed can reach Class 10 Level ; and SPI NAND Mainstream or 1-bit transmission mode , Reading and writing speed is much slower .

2.4 stability

SD NAND Due to the built-in Management Algorithm , It will be much better in stability . Especially for power failure protection . for example CS Brand SD NAND The second generation passed the customer 10K Times of random power failure test . and SPI NAND Follow Raw NAND  all “ Inherit ” 了 NAND Flash The disadvantages of the erase before write mechanism , It is easy to lose data when suddenly losing power when writing data .

On the whole SD NAND Is an integrated NAND Flash Algorithm Total Solution, and SPI NAND Mainly to complete the conversion of the agreement , The built-in algorithm is not complete .

About CS brand SD NAND Detailed introduction , You can refer to the following links ：http://www.longsto.com/product/31.html Welcome interested friends to consult .

As a professional storage solution provider , The products provided are ：SD NAND,Raw NAND,SPI NAND,eMMC,TF card ,SSD etc. . Any questions about storage are welcome to consult us . Service call :13691982107 Wechat same number .