Arria® V Device Handbook: Volume 1: Device Interfaces and Integration

ID 683213
Date 10/18/2023
Public
Document Table of Contents

11.2. Programmable Power Technology

Arria® V  GZ devices offer the ability to configure portions of the core, called tiles, for high-speed or low-power mode of operation performed by the Quartus® Prime software without user intervention. Setting a tile to high-speed or low-power mode is accomplished with on-chip circuitry and does not require extra power supplies brought into the Arria® V  GZ device. In a design compilation, the Quartus® Prime software determines whether a tile should be in high-speed or low-power mode based on the timing constraints of the design.

Arria® V GZ tiles consist of the following:

  • Memory logic array block (MLAB)/ logic array block (LAB) pairs with routing to the pair
  • MLAB/LAB pairs with routing to the pair and to adjacent digital signal processing (DSP)/ memory block routing
  • TriMatrix memory blocks
  • DSP blocks
  • PCI Express® (PCIe®) hard IP
  • Physical coding sublayer (PCS)

All blocks and routing associated with the tile share the same setting of either high-speed or low-power mode. By default, tiles that include DSP blocks or memory blocks are set to high-speed mode for optimum performance. Unused DSP blocks and memory blocks are set to low-power mode to minimize static power. Clock networks do not support programmable power technology.

With programmable power technology, faster speed grade FPGAs may require less power because there are fewer high-speed MLAB and LAB pairs, when compared with slower speed grade FPGAs. The slower speed grade device may have to use more high-speed MLAB and LAB pairs to meet performance requirements.

The Quartus® Prime software sets unused device resources in the design to low-power mode to reduce the static power. It also sets the following resources to low-power mode when they are not used in the design:

  • LABs and MLABs
  • TriMatrix memory blocks
  • DSP blocks

If a phase-locked loop (PLL) is instantiated in the design, you may assert the areset pin high to keep the PLL in low-power mode.

Altera recommends that you power down unused PCIe* HIPs, per side, by connecting the PCIe* HIP power to GND on the PCB for additional power savings. All of the HIPs on a side of the device must be unused to be powered down. For additional information refer to the pin connection guidelines.

Table 120.  Programmable Power Capabilities for Arria® V  GZ DevicesThis table lists the available Arria® V  GZ programmable power capabilities. Speed grade considerations can add to the permutations to give you flexibility in designing your system.
Feature Programmable Power Technology
LAB Yes
Routing Yes
Memory Blocks Fixed setting 45
DSP Blocks Fixed setting45
Clock Networks No
45 Tiles with DSP blocks and memory blocks that are used in the design are always set to high-speed mode. By default, unused DSP blocks and memory blocks are set to low-power mode.