1.3.2.4 EEPROM (see page 615)
The TM4C1294NCPDT microcontroller includes an EEPROM with the following features:
■ 6Kbytes of memory accessible as 1536 32-bit words
■ 96 blocks of 16 words (64 bytes) each
■ Built-in wear leveling
■ Access protection per block
■ Lock protection option for the whole peripheral as well as per block using 32-bit to 96-bit unlock
codes (application selectable)
■ Interrupt support for write completion to avoid polling
■ Endurance of 500K writes (when writing at fixed offset in every alternate page in circular fashion)
to 15M operations (when cycling through two pages ) per each 2-page block.
1.3.3 External Peripheral Interface (see page 815)
The External Peripheral Interface (EPI) provides access to external devices using a parallel path.
Unlike communications peripherals such as SSI, UART, and I
2
C, the EPI is designed to act like a
bus to external peripherals and memory.
The EPI has the following features:
■ 8/16/32-bit dedicated parallel bus for external peripherals and memory
■ Memory interface supports contiguous memory access independent of data bus width, thus
enabling code execution directly from SDRAM, SRAM and Flash memory
■ Blocking and non-blocking reads
■ Separates processor from timing details through use of an internal write FIFO
■ Efficient transfers using Micro Direct Memory Access Controller (µDMA)
– Separate channels for read and write
– Read channel request asserted by programmable levels on the internal Non-Blocking Read
FIFO (NBRFIFO)
– Write channel request asserted by empty on the internal Write FIFO (WFIFO)
The EPI supports three primary functional modes: Synchronous Dynamic Random Access Memory
(SDRAM) mode, Traditional Host-Bus mode, and General-Purpose mode. The EPI module also
provides custom GPIOs; however, unlike regular GPIOs, the EPI module uses a FIFO in the same
way as a communication mechanism and is speed-controlled using clocking.
■ Synchronous Dynamic Random Access Memory (SDRAM) mode
– Supports x16 (single data rate) SDRAM at up to 60 MHz
– Supports low-cost SDRAMs up to 64 MB (512 megabits)
59June 18, 2014
Texas Instruments-Production Data
Tiva
™
TM4C1294NCPDT Microcontroller
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