RM46L852
www.ti.com
SPNS185 –SEPTEMBER 2012
4.5 ARM
©
Cortex-R4F™ CPU Information
4.5.1 Summary of ARM Cortex-R4F™ CPU Features
The features of the ARM Cortex-R4F™ CPU include:
• An integer unit with integral EmbeddedICE-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 please see www.arm.com.
4.5.2 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)
4.5.3 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 4-3.
The CPUs have a diverse CPU placement given by following requirements:
• different orientation; e.g. CPU1 = "north" orientation, CPU2 = "flip west" orientation
• dedicated guard ring for each CPU
Figure 4-2. Dual - CPU Orientation
Copyright © 2012, Texas Instruments Incorporated System Information and Electrical Specifications 59
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