The TMS570LS31x4/21x4 device is a high-performance automotive-grade
microcontroller family for safety systems. The safety architecture includes dual
CPUs in lockstep, CPU and memory BIST logic, ECC on both the flash and the data
SRAM, parity on peripheral memories, and loopback capability on peripheral
The TMS570LS31x4/21x4 device integrates the ARM Cortex-R4F Floating-Point
CPU. The CPU offers an efficient 1.66 DMIPS/MHz, and has configurations that can
run up to 180 MHz, providing up to 298 DMIPS. The device supports the
word-invariant big-endian [BE32] format.
The TMS570LS3134 device has 3MB of integrated flash and 256KB of data RAM.
The TMS570LS2134 device has 2MB of integrated flash and 256KB of data RAM. The
TMS570LS2124 device has 2MB of integrated flash and 192KB of data RAM. Both the
flash and RAM have single-bit error correction and double-bit error detection.
The flash memory on this device is a nonvolatile, electrically erasable, and
programmable memory implemented with a 64-bit-wide data bus interface. The flash
operates on a 3.3-V supply input (same level as I/O supply) for all read,
program, and erase operations. When in pipeline mode, the flash operates with a
system clock frequency of up to 180 MHz. The SRAM supports single-cycle read and
write accesses in byte, halfword, word, and double-word modes.
The TMS570LS31x4/21x4 device features peripherals for real-time control-based
applications, including two Next Generation High-End Timer (N2HET) timing
coprocessors and two 12-bit Analog-to-Digital Converters (ADCs) supporting up to
The N2HET is an advanced intelligent timer that provides sophisticated timing
functions for real-time applications. The timer is software-controlled, using a
reduced instruction set, with a specialized timer micromachine and an attached
I/O port. The N2HET can be used for pulse-width-modulated outputs, capture or
compare inputs, or GPIO. The N2HET is especially well suited for applications
requiring multiple sensor information and drive actuators with complex and
accurate time pulses. A High-End Timer Transfer Unit (HTU) can perform DMA-type
transactions to transfer N2HET data to or from main memory. A Memory Protection
Unit (MPU) is built into the HTU.
The device has two 12-bit-resolution MibADCs with 24 channels and 64 words of
parity-protected buffer RAM each. The MibADC channels can be converted
individually or can be grouped by software for sequential conversion sequences.
Sixteen channels are shared between the two MibADCs. There are three separate
groupings. Each sequence can be converted once when triggered or configured for
continuous conversion mode. The MibADC has a 10-bit mode for use when
compatibility with older devices or faster conversion time is desired.
The device has multiple communication interfaces: three MibSPIs, two SPIs,
one LIN, one SCI, three DCANs, and one I2C module. The SPIs provide a convenient
method of serial high-speed communication between similar shift-register type
devices. The LIN supports the Local Interconnect standard 2.0 and can be used as
a UART in full-duplex mode using the standard Non-Return-to-Zero (NRZ)
The DCAN supports the CAN 2.0 (A and B) protocol standard and uses a serial,
multimaster communication protocol that efficiently supports distributed
real-time control with robust communication rates of up to 1 Mbps. The DCAN is
ideal for systems operating in noisy and harsh environments (for example,
automotive vehicle networking and industrial fieldbus) that require reliable
serial communication or multiplexed wiring.
The I2C module is a multimaster communication module providing an interface
between the microcontroller and an I2C-compatible device through the
I2C serial bus. The I2C supports speeds of 100 and 400
The Frequency-Modulated Phase-Locked Loop (FMPLL) clock module is used to
multiply the external frequency reference to a higher frequency for internal
use. There are two FMPLL modules on this device. These modules, when enabled,
provide two of the seven possible clock source inputs to the Global Clock Module
(GCM). The GCM manages the mapping between the available clock sources and the
device clock domains.
The device also has an External Clock Prescaler (ECP) module that when
enabled, outputs a continuous external clock on the ECLK pin (or ball). The ECLK
frequency is a user-programmable ratio of the peripheral interface clock (VCLK)
frequency. This low-frequency output can be monitored externally as an indicator
of the device operating frequency.
The DMA controller has 16 channels, 32 peripheral requests, and parity
protection on its memory. An MPU is built into the DMA to limit the DMA to
prescribed areas of memory and to protect the rest of the memory system from any
malfunction of the DMA.
The Error Signaling Module (ESM) monitors all device errors and determines
whether an interrupt is generated or the external ERROR pin is toggled when a fault is
detected. The ERROR pin can be
monitored externally as an indicator of a fault condition in the
The External Memory Interface (EMIF) provides off-chip expansion capability
with the ability to interface to synchronous DRAM (SDRAM) devices, asynchronous
memories, peripherals, or FPGA devices.
Several interfaces are implemented to enhance the debugging capabilities of
application code. In addition to the built-in ARM Cortex-R4F CoreSight debug
features, an External Trace Macrocell (ETM) provides instruction and data trace
of program execution. For instrumentation purposes, a RAM Trace Port (RTP)
module is implemented to support high-speed tracing of RAM and peripheral
accesses by the CPU or any other master. A Data Modification Module (DMM) gives
the ability to write external data into the device memory. Both the RTP and DMM
have no or only minimum impact on the program execution time of the application
code. A Parameter Overlay Module (POM) can reroute flash accesses to internal
memory or to the EMIF. This rerouting allows the dynamic calibration against
production code of parameters and tables without rebuilding the code to
explicitly access RAM or halting the processor to reprogram the data flash.
With integrated safety features and a wide choice of communication and
control peripherals, the TMS570LS31x4/21x4 device is an ideal solution for
high-performance real-time control applications with safety-critical