TMS570LS3137
SPNS162.–SEPTEMBER 2011
www.ti.com
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 trace interface to a CoreSight ETM-R4.
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
Harware 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
Flip West
North
Figure 4-2. Dual - CPU Orientation
56
System Information and Electrical Specifications
Submit Documentation Feedback
focus.ti.com: TMS570LS3137
Copyright © 2011, Texas Instruments Incorporated
TI [ TEXAS INSTRUMENTS ]
