The TMS570LS31x5/21x5 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 I/Os.
The TMS570LS31x5/21x5 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 TMS570LS3135 device has 3MB of
integrated flash and 256KB of data RAM. The TMS570LS2135 device has 2MB of integrated flash and
256KB of data RAM. The TMS570LS2125 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 TMS570LS31x5/21x5 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 24 inputs.
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,
one I2C module, and one
FlexRay controller. 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) format.
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 FlexRay controller uses a
dual-channel serial, fixed time base multimaster communication protocol with communication rates of
10 Mbps per channel. A FlexRay Transfer Unit (FTU) enables autonomous transfers of FlexRay data to
and from the CPU main memory. Transfers are protected by a dedicated, built-in MPU.
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 Kbps.
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 control packets, 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 microcontroller.
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 TMS570LS31x5/21x5 device is an
ideal solution for high-performance real-time control applications with safety-critical
requirements.
