V831
来自Jack's Lab
目录 |
1 Overview
全志 V831
- Cortex-A7 单核，800MHz
- SIP 64MB DDR2
- 0.2T NPU
- TWI x4
- SPI x2
- SMHC x2
- GPADC x1
- Serial RGB, i8080
- 100M Ethernet with RGMII
- QFN88
2 Pinmap
- 36: PH14/JTAG_DI/MDIO/SPI1_CS0/TWI3_SDA
- 37: PH13/JTAG_DO/MDC/SPI1_MISO/TWI3_SCK
- 38: PH12/JTAG_CK/RMII_TXEN/SPI1_MOSI/TWI2_SDA
- 39: PH11/JTAG_MS/RMII_TXCK/SPI1_CLK/TWI2_SCK
- 40: PH10/RMII_TXD0/TWI3_SDA/UART0_RX
- 41: PH9/PWM_9/RMII_TXD1/TWI3_SCK/UART0_TX
- 42: PH8/PWM_8/RMII_RXER/UART0_RX/UART2_CTS
- 43: PH7/PWM_7/RMII_CRS_DV/UART0_TX/UART2_RTS
- 44: PH6/PWM_6/RMII_RXD0/TWI2_SDA/UART2_RX
- 45: VDD_SYS3
- 46: VCC18_IO
- 47: PH5/PWM_5/RMII_RXD1/TWI2_SCK/UART2_TX
- 48: PH4/PWM_4/I2S0_DIN/SPI1_CS1/ONEWIRE
- 49: PH3/PWM_3/I2S0_DOUT/SPI1_CS0/UART3_RTS
- 50: PH2/PWM_2/I2S0_LRCK/SPI1_MISO/UART3_CTS
- 51: PH1/PWM_1/I2S0_BCLK/SPI1_MOSI/UART3_RX
- 52: PH0/PWM_0/I2S0_MCLK/SPI1_CLK/UART3_TX
- 53: VCC_IO
- 54: GPADC0
- 55: AVCC
- 56: LINEOUTP
- 57: VRA1
- 58: AGND
- 59: VRA2
- 60: MICIN1N
- 61: MICIN1P
- 62: VDD_SYS4
- 63: PC0/SPI0_CLK
- 64: PC1/SPI0_CS0
- 65: PC2/SPI0_MOSI
- 66: PC3/SPI0_MISO
- 67: PC4/SPI0_WP
- 68: PC5/SPI0_HOLD
- 69: MCSIA_D0N
- 70: MCSIA_D0P
- 71: MCSIA_D1P
- 72: MCSIA_D1N
- 73: MCSIA_CKN
- 74: MCSIA_CKP
- 75: VCC_MCSI
- 76: USB0_DP
- 77: USB0_DM
- 78: PI0/CSI_MASTERCLK0
- 79: PI1/CSI_SM_HS/TWI1_SCK
- 80: PI2/CSI_SM_VS/TWI1_SDA
- 81: PD1/LCD_D3/PWM_0/RMII_RXD1
- 82: PD2/LCD_D4/PWM_1/RMII_RXD0
- 83: PD3/LCD_D5/PWM_2/RMII_CRS_DV
- 84: PD4/LCD_D6/PWM_3/RMII_RXER
- 85: PD5/LCD_D7/PWM_4/RMII_TXD1
- 86: PD6/LCD_D10/PWM_5/RMII_TXD0
- 87: PD7/LCD_D11/PWM_6/RMII_TXCK
- 88: PD8/LCD_D12/PWM_7/RMII_TXEN
3 NPU
V831的NPU是基于NVIDIA（英伟达）深度学习加速器（NVDLA）开源架构的定制来实现的
- NPU 时钟默认为 400 MHz，但可以设置在 100 到 1200 MHz 之间
- NPU 采用 nv_small 配置（NV 小型模型）实现，所有数据操作都依赖于共享系统内存。
- 支持 int8 和 int16，首选 int8 以提高速度和有限的板载内存（64Mb）
- 64 个 Mac (Atomic-C*Atomic-K）
- 可从用户空间编程的内存映射寄存器
- 当引用权重和输入/输出数据位置时，需要物理的地址，这意味如果从用户空间访问内核内存，则需要分配内核内存并检索物理地址。
- NPU 权重和输入/输出数据遵循与深度学习加速器（NVDLA）专用格式类似的布局，因此必须要先转换为 nhwc 或 nchw 等格式，然后再将其传送到 NPU。
4 Quick Start
V831 对应 sun8iw19p1 的代号
- https://cn.maixpy.sipeed.com/maixpy3/zh/install/maixii_m2dock/flash.html
- https://www.cnblogs.com/juwan/p/14336100.html
- V831/V833 的 SDK 的 kernel & package 的开发方法
5 Reference
- https://wiki.sipeed.com/hardware/zh/maixII/index.html
- https://dl.sipeed.com/shareURL/MaixII
- http://www.sochip.com.cn/v831/index.php?title=What_is_V831_%3F
