Overview

The Arm CoreLink System Controllers

Arm CoreLink System Controllers orchestrate critical AMBA system tasks such as hardware virtualization support, interrupt management, L3 cache operation, DMA, TrustZone security and peripheral operation. Designed for optimal compatibility with Arm processors and Multimedia IP, they are the natural complements to the System IP Interconnect and Memory Controller product lines. 

Generic Interrupt Controller (GIC)

 

  • Supports interrupt detection, prioritization, re-distribution and virtualization
  • Handles Private Peripheral Interrupts (PPI), Shared Peripheral Interrupts (SPI), Software Generated Interrupts (SGI) and Locality Peripheral Interrupts (LPI)
  • GIC-500 also supports message-based interrupts such as PCI Express MSI/MSI-X interrupts, and Interrupt Translation Services for ID translation and core migration

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System Memory Management Unit

 

  • Provides same view of memory to IO peripheral devices as CPU using stage1 and/or stage2 virtual to physical address translation
  • Enforces memory protection and access schematic while extending memory virtualization services that match those provided by the main application processor to ensure consistent security across the SoC
  • The CoreLink MMU-600 has a stage 2 protection mechanism which enables TrustZone Media Protection v2 (TZMP2) with master side filtering

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Other System Controllers

 

  •  Controllers perform critical system tasks such as TrustZone Security, DMA, Level 2 Cache and IO Peripherals' operation

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Use Cases

System Controllers are used for many functions within an SoC, including:

Virtualization

Virtualization is the ability of a system to support multiple virtual machines each running its own guest operating system with its own private access to memory and IO peripherals without any interference whatsoever from the others. Arm's SMMU enables hardware virtualization by performing stage1 and/or stage2 address translation for IO devices, thereby providing them with the same view of memory as the CPU/GPU. 


Memory Mapping

Another interesting use case of SMMU is to perform memory mapping to enable a programmable view of memory for IO peripherals. As an example, SMMU supports scatter-gather operations whereby an IO peripheral can access disjoint locations of physical memory as a single contiguous block of virtual memory due to the SMMU translation. This results in improved utilization of memory while ensuring that the IO peripheral performance is not affected. 


Cache Control

CPU to off-chip memory communication has become the performance bottleneck in many SoCs. Level 2 Cache Controllers improve CPU performance by keeping memory access on-chip with a typical latency 10-25% of accessing the data off-chip. At the same time, the reduced CPU demands on the off-chip memory bandwidth free up that resource for other masters. Level 2 Cache Controllers also contribute significantly to power efficiency as on-chip accesses are typically an order of magnitude lower in power versus going off-chip. Typically these are embedded inside the CPU or delivered as standalone components optimized to match the processor requirements and integrate easily into the AMBA interconnect.


Interrupt Management & Translation

Arm GICs perform the key function of interrupt management and translation. Management functions include detection, masking, prioritization and routing of interrupts to the appropriate cores. Interrupt Translation Service (ITS) modules in the GIC perform the task of device isolation and ID translation for incoming message-based interrupts, thereby enabling virtual machines to program peripherals directly.


Security

Arm's TrustZone security platform enables hardware-based secure access to regions of both off-chip memory and on-chip SRAM. The memory space is divided into a configurable number of regions each with its own access permissions. This setup ensures that malicious software cannot compromise system operation by latching onto data or code it shouldn't have access to. 


Direct Access to Memory

Arm's CoreLink DMA controllers perform critical functions of moving streams of data between a peripheral and memory without overloading the CPU. Software programs typically write the data transfer instructions to memory and trigger the DMA engine which then takes over and performs the data move without incurring any additional overhead on the CPU.

 

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0 votes 207 views 0 replies Started 2 days ago by Mr'Triangle Answer this
Suggested answer Dongle over the network.
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Answered Question about AXI4 WLAST 0 votes 1024 views 1 replies Latest 7 days ago by Colin Campbell Answer this
Answered FIXED WRITE transfer of AWLEN=8'd4 in AXI4 Latest yesterday by Colin Campbell 1 replies 252 views
Answered Handling invalid AXI address requests Latest yesterday by Colin Campbell 1 replies 571 views
Answered AXI INC type transfer Latest 2 days ago by Ravi V. 2 replies 585 views
Not answered Use for DSI5168 of Arm M3 Started 2 days ago by Mr'Triangle 0 replies 207 views
Suggested answer Dongle over the network. Latest 5 days ago by NickMan9 4 replies 546 views
Answered Question about AXI4 WLAST Latest 7 days ago by Colin Campbell 1 replies 1024 views