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CC3135 Datasheet(PDF) 50 Page - Texas Instruments

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Part No. CC3135
Description  SimpleLink Wi-Fi, Dual-Band Network Processor, solution for MCU applications
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Maker  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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CC3135 Datasheet(HTML) 50 Page - Texas Instruments

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CC3135
SWAS037 – JANUARY 2019
www.ti.com
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Product Folder Links: CC3135
Detailed Description
Copyright © 2019, Texas Instruments Incorporated
6.6
Memory
6.6.1
External Memory Requirements
The CC3135 device maintains a proprietary file system on the sFLASH. The CC3135 file system stores
the service pack file, system files, configuration files, certificate files, web page files, and user files. By
using a format command through the API, users can provide the total size allocated for the file system.
The starting address of the file system cannot be set and is always at the beginning of the sFLASH. The
applications microcontroller must access the sFLASH memory area allocated to the file system directly
through the CC3135 file system. The applications microcontroller must not access the sFLASH memory
area directly.
The file system manages the allocation of sFLASH blocks for stored files according to download order,
which means that the location of a specific file is not fixed in all systems. Files are stored on sFLASH
using human-readable filenames rather than file IDs. The file system API works using plain text, and file
encryption and decryption is invisible to the user. Encrypted files can be accessed only through the file
system.
All file types can have a maximum of 100 supported files in the file system. All files are stored in 4-KB
blocks and thus use a minimum of 4KB of Flash space. Fail-safe files require twice the original size and
use a minimum of 8KB. Encrypted files are counted as fail-safe in terms of space. The maximum file size
is 1MB.
Table 6-2 lists the minimum required memory consumption under the following assumptions:
System files in use consume 64 blocks (256KB).
Vendor files are not taken into account.
Gang image:
Storage for the gang image is rounded up to 32 blocks (meaning 128-KB resolution).
Gang image size depends on the actual content size of all components. Additionally, the image
should be 128-KB aligned so unaligned memory is considered lost. Service pack, system files, and
the 128-KB aligned memory are assumed to occupy 256KB.
All calculations consider that the restore-to-default is enabled.
Table 6-2. Recommended Flash Size
ITEM
CC3135 [KB]
File system allocation table
20
System and configuration files
256
Service Pack
264
Gang image size
256
Total
796
Minimal Flash size
8MBit
Recommended Flash size
16MBit
NOTE
The maximum supported serial flash size is 32MB (256Mb) (see Using Serial Flash on
CC3135/CC3235 SimpleLink™ Wi-Fi® and Internet-of-Things Devices).


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