CC3220MOD_017 Datasheet, PDF (64/100 Pages) Texas Instruments – SimpleLink Wi-Fi CERTIFIED Wireless MCU Modules

CC3220MOD, CC3220MODA
SWRS206B – MARCH 2017 – REVISED AUGUST 2017
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6.7 Memory
6.7.1 Internal Memory
The CC3220x device within the CC3220MODx and CC3220MODAx modules includes on-chip SRAM to
which application programs are downloaded and executed. The application developer must share the
SRAM for code and data. The micro direct memory access (μDMA) controller can transfer data to and
from SRAM and various peripherals. The CC3220x device ROM holds the rich set of peripheral drivers,
which saves SRAM space. For more information on drivers, see the CC3220x API list.
6.7.1.1 SRAM
The CC3220MODx and CC3220MODAx family provides 256KB of on-chip SRAM. Internal RAM is
capable of selective retention during LPDS mode. This internal SRAM is at offset 0x2000 0000 of the
device memory map.
Use the μDMA controller to transfer data to and from the SRAM.
When the device enters low-power mode, the application developer can choose to retain a section of
memory based on need. Retaining the memory during low-power mode provides a faster wakeup. The
application developer can choose the amount of memory to retain in multiples of 64KB. For more
information, see the API guide.
6.7.1.2 ROM
The internal zero-wait-state ROM of the CC3220MODx and CC3220MODAx module is at address
0x0000 0000 of the device memory and is programmed with the following components:
• Bootloader
• Peripheral driver library (DriverLib) release for product-specific peripherals and interfaces
The bootloader is used as an initial program loader (when the serial Flash memory is empty). The
DriverLib software library of the CC3220MODx and CC3220MODAx controls on-chip peripherals with a
bootloader capability. The library performs peripheral initialization and control functions, with a choice of
polled or interrupt-driven peripheral support. The DriverLib APIs in ROM can be called by applications to
reduce Flash memory requirements and free the Flash memory to be used for other purposes.
6.7.1.3 Flash Memory
The CC3220SF device within the CC3220MODSF and CC3220MODASF modules comes with an on-chip
Flash memory of 1MB that allows application code to execute in place while freeing SRAM exclusively for
read-write data. The Flash memory is used for code and constant data sections and is directly attached to
the ICODE/DCODE bus of the Cortex-M4 core. A 128-bit-wide instruction prefetch buffer allows
maintenance of maximum performance for linear code or loops that fit inside the buffer.
The Flash memory is organized as 2-KB sectors that can be independently erased. Reads and writes can
be performed at word (32-bit) level.
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Detailed Description
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