Datasheet

North

Flip West

TMS570LS1224

www.ti.com

SPNS190B –OCTOBER 2012–REVISED FEBRUARY 2015

6.5 ARM Cortex-R4F CPU Information

6.5.1 Summary of ARM Cortex-R4F CPU Features

The features of the ARM Cortex-R4F CPU include:

• An integer unit with integral Embedded ICE-RT logic.

• High-speed Advanced Microprocessor Bus Architecture (AMBA) Advanced eXtensible Interfaces (AXI)

for Level two (L2) master and slave interfaces.

• Floating Point Coprocessor

• Dynamic branch prediction with a global history buffer, and a 4-entry return stack

• Low interrupt latency.

• Non-maskable interrupt.

• A Harvard Level one (L1) memory system with:

– Tightly-Coupled Memory (TCM) interfaces with support for error correction or parity checking

memories

– ARMv7-R architecture Memory Protection Unit (MPU) with 12 regions

• Dual core logic for fault detection in safety-critical applications.

• An L2 memory interface:

– Single 64-bit master AXI interface

– 64-bit slave AXI interface to TCM RAM blocks

• A debug interface to a CoreSight Debug Access Port (DAP).

• A Performance Monitoring Unit (PMU).

• A Vectored Interrupt Controller (VIC) port.

For more information on the ARM Cortex-R4F CPU, see www.arm.com.

6.5.2 ARM Cortex-R4F CPU Features Enabled by Software

The following CPU features are disabled on reset and must be enabled by the application if required.

• ECC On Tightly-Coupled Memory (TCM) Accesses

• Hardware Vectored Interrupt (VIC) Port

• Floating Point Coprocessor

• Memory Protection Unit (MPU)

6.5.3 Dual Core Implementation

The device has two Cortex-R4F cores, where the output signals of both CPUs are compared in the CCM-

R4 unit. To avoid common mode impacts the signals of the CPUs to be compared are delayed by 2 clock

cycles as shown in Figure 6-3.

The CPUs have a diverse CPU placement given by following requirements:

• different orientation; for example, CPU1 = "north" orientation, CPU2 = "flip west" orientation

• dedicated guard ring for each CPU

Figure 6-2. Dual - CPU Orientation

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