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Atlas 200 Hardware Development Guide 02

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Power Supply Design

Power Supply Design

Voltage and current

The Atlas 200 has only one power input whose singal name is VSYS. The input voltage is 3.5 V to 4.5 V, and the typical value is 3.8 V. When the maximum power consumption is reached, the transient current of the Atlas 200 reaches 8 A. The power supply capability must be greater than 8 A.

power consumption

The typical power consumption of the Atlas 200 is 11.0 W (16 TOPS). Table 3-1 and Table 3-2 lists the power consumption data of the Atlas 200 in different computing capability scenarios. When using the Atlas 200, provide sufficient current based on the computing capability.

Table 3-1 Power consumption specifications of the Atlas 200 8GB

Typical Power Consumption

100% of computing performance

Typical Power Consumption

72% of computing performance

Typical Power Consumption

36% of computing performance

Typical Power Consumption

18% of computing performance

11.0W

9.5W

9.0W

7.0W

Table 3-2 Power consumption specifications of the Atlas 200 4GB

Typical Power Consumption

100% of computing performance

Typical Power Consumption

72% of computing performance

Typical Power Consumption

36% of computing performance

Typical Power Consumption

18% of computing performance

7.5W

6.5W

6.0W

5.0W

Power-on time sequence

The Atlas 200 integrates power management. After the VSYS is powered on, the Power Management Unit (PMU) completes the power-on timing inside the Atlas 200.

  • The RESET in Figure 3-1 is the internal reset signal of the Ascend 310. After the reset, the system boots from the ON-CHIP-ROM of the Ascend 310, and then runs the xloader from the SPI FLASH. The PCIe device is initialized in the xloader phase. Before initializing the PCIe, ensure that the input of the PCIe reference clock is stable and that the /PCIE_HI1910_PERST_N signal is pulled up.
  • The Atlas 200 provides the power enable signal HOST_POWER_EN. You can control power-on and power-off based on application scenarios, as shown in Figure 3-2.

    When using the HOST_POWER_EN signal, ensure that the power-on timing of the PCIe device is met. The system is powered on 5 ms after the HOST_POWER_EN signal is pulled up. The HOST_POWER_EN signal is pulled up inside the Atlas 200. To power on the system, float the signal.

Figure 3-1 Power-on timing of the Atlas 200
Figure 3-2 Wired control power-on timing of the Atlas 200

The Atlas 200 has two reset signals: PCIE_PERST_N and HOST_RST_N.

  • PCIE_PERST_N is a standard Atlas 200 device reset signal, indicating the PCIe PHY initialization status. It can also be configured as an Ascend 310 hot reset signal by software.

    By default, this signal is the PCIe PHY reset indicator during power-on. After power-on, the signal can be configured as the chip hot reset. It is recommended that the OD interface be used to avoid impacting the reset of PCIe PHY during power-on.

  • HOST_RST_N is the reset signal of the Ascend 310 chip. This signal is connected to the RESET signal inside the Atlas 200. It is recommended that this signal not be controlled during the power-on phase of the Atlas 200.

    It is recommended that the OD interface be used for control. When the Atlas 200 is abnormal, this signal can be used to initiate the hot reset of the Atlas 200. The minimum pull down time of the hot reset is 150 us.

NOTE:

After the Atlas 200 is powered on, it is not allowed to remove and insert it. The Atlas 200 can be removed and inserted only when the PCB is powered off.

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Updated: 2019-07-29

Document ID: EDOC1100079542

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