Cypress Semiconductor CY8C21534 Especificaciones descargar pdf (Pagina 13)

The next critical section of the memory is the root directory. This contains different

entries, each 32 bytes long, for each file stored in memory. Figure 4 shows a root

directory with one file.

Figure 4: Screenshot of Root Directory Table Using HxD Hex Editor. Screenshot [1].

Shown in the file are examples of information given in the directory section. A total list

of given information includes file name, file type, creation time, last accessed time,

modified time, file cluster, and file size in bytes. This data allows the user to find all the

information about the file and allows the host device to find the raw data in the

memory. The first cluster gives the starting position of the file, and the file size allows

the end of the file to be found.

The last section of the FAT 16 format is the volume boot record. This section is used to

store the raw data of the file. The read and write function will work with a continuous

stream of data in or out but must be moved in chunks of 512 bytes as the SD card

uses responses to ensure data was transferred correctly.

When these entries are properly written to the SD card memory, the file can then be

read by a computer’s operating system or similar devices such as the electronic picture

frame used as the display for this project. [2.]

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Cypress Semiconductor CY8C21534 Especificaciones Pagina 13