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Gauthier Provost 2020-04-15 15:02:04 +08:00
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docs/helios64/m2.md
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M.2, formerly known as the Next Generation Form Factor (NGFF), is a specification for internally mounted computer expansion cards and associated connectors. M.2 formerly known as the Next Generation Form Factor (NGFF) is a specification for internally mounted computer expansion cards and associated connectors. The M.2 replaces the mSATA standard.
M.2 replaces the mSATA standard, which uses the PCI Express Mini Card physical card layout and connectors.
Supported bus in the Helios64 M.2 interface is SATA and USB 2.0. Helios64 provides an M.2 interface (J2) to connect the following expansion cards:
!!! Warning * M.2 SATA SSD
PCIe SSD is not supported. * M.2 USB2.0 modules (e.g NPU extension).
---TBU--- ![M.2 Location](/helios64/img/m2/m2.jpg)
## Location !!! Important
PCIe SSD is not supported.
Helios64 support M.2 device on header P2 which is located next to SATA 1 connector. ## Form Factor and Keying
You can refer to the connector/interface list at [hardware overview](/helios64/hardware#connector-interface-list) page.
The location of the M.2 socket is shown in below figure:
![M2 Pinout](/helios64/img/m2/m2-zoom-w-symbol.jpg) The M.2 connector (J2) is Key-B which is compatible with most of M.2 SATA SSD of Key-B or Key-M+B Key form factors.
## Size ![M.2 Keying](/helios64/img/m2/m2_keying.jpg)
The maximum size of supported M.2 device is the 2280 size. The board provides mounting holes for 2260 and 2280 cards.
## Notes related to M.2 Card ![M.2 Form Factor](/helios64/img/m2/m2_form_factor.jpg)
The M.2 devices installed in Helios64 is configured as sharing devices with SATA Port 1.
Therefore if you install M.2 SATA module, you will not be able to access the SATA Port 1.
In another case, if you use the M.2 USB module, the SATA Port 1 still accessible from the system.
The USB bus is connected to the [OHCI/EHCI Host 0](/helios64/usb/#usb-on-helios64). ## Usage
The M.2 socket in the Helios64 board may NOT support USB modem (WWAN), because the USB modem requires the SIM Card connection and another signal. The M.2 interface on Helios64 only supports SATA 3.0 and USB 2.0 buses.
The M.2 SATA bus is shared with SATA Port 1. Therefore if you install an M.2 SATA SSD card, SATA Port 1 (J3) will automatically get disabled. But if you use the M.2 interface for USB modules, the SATA Port 1 (J3) is still enabled and accessible by the system.
For more details refer to [SATA page](/helios64/sata/).
!!! Note
The M.2 interface on Helios64 may NOT support USB modem (WWAN) because USB modem often requires external SIM Card connection and other signals.