# Overview of peripheral interfaces
Source: [https://docs.qualcomm.com/doc/80-70017-8/topic/overview-of-wired-interfaces.html](https://docs.qualcomm.com/doc/80-70017-8/topic/overview-of-wired-interfaces.html)
The Qualcomm® Linux® interfaces guide describes both the low-speed and high-speed
input/output (I/O) peripheral interface subsystems used in the System-on-Chip
(SoC).
- The low-speed I/O interfaces operate at a lower frequency than the high-speed
interfaces in the SoC. The Qualcomm universal peripheral (QUP) v3 serial engine is a
hardware core that supports the following low-speed peripheral interfaces:
- Universal asynchronous receiver/transmitter (UART)
- Serial peripheral interface (SPI)
- Interintegrated circuit (I2C)
- Improved interintegrated circuit (I3C)
interfaces
These low-speed interfaces are used to communicate with low-speed
peripherals, such as sensor interface devices, Bluetooth® wireless technology
devices, display or touch interface devices, and other low-speed
devices.
- The high-speed I/O interfaces include the following peripheral interfaces:
- Peripheral component interconnect express (PCIe)
- Universal serial bus (USB)
The high-speed I/O interfaces are used to connect to high-speed devices,
such as solid-state drives, network cards, external graphics cards.
The following figure shows the software stack for peripheral interfaces.
Figure : Peripheral interfaces software stack
### QUP v3
Qualcomm uses QUP v3, a highly flexible and programmable hardware to support a wide
range of serial interfaces. For more information on QUP v3, see the following
resources:
- QUP v3 overview
- Supported transfer modes in QUP v3
- QUP v3 access control customization
- QUP v3 firmware status verification
### QCS6490 and QCS5430 interface overview
The following table lists the device interface features for QCS6490 and QCS5430. For
information on GPIO mapping, see QUP v3 mapping to protocols and GPIOs in QCS6490 and QCS5430.
Table : QCS6490 and QCS5430 device interfaces
| **2xQUP v3 serial engine** |
| :---: |
| Serial engine instances | QUPV3\_0 | QUPV3\_1 |
| Application processor QUP v3 serial engine | 8 | 8 |
| LPI QUP v3 serial engine | 5 | – |
| **2xUSB controller** |
| Controller address | 0xa600000 | 0x8c00000 |
| Max Speed | USB 3.x SuperSpeed | USB 2.0 high speed |
| HS/SS PHY power rails |