基于Mcrosemi M2S090T FPGA 的 imx991 SWIR的SLVS解码（一）

目录

一、平台介绍

二、器件的简介

1、imx991?SWIR?Image Sensor

2、M2S090T

三、工程

1、imx991寄存器配置

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一、平台介绍

工程开发平台：Libero Version:20231.0.6 Release:v2023.1

文本编辑器：Sublime text3?

二、器件的简介

1、imx991?SWIR?Image Sensor

• Description :

The IMX991-AABA-C is a diagonal 4.1 mm (Type 1 / 4) CMOS active pixel type solid-state image sensor with a?square pixel array and 0.33 M effective pixels. This chip features a global shutter with variable charge-integration?time. This chip has a wide waveband (0.4 μm to 1.7 μm) with high sensitivity, high resolution, low dark current and?low power consumption. ??

• Features?

◆ CMOS active pixel type dots?
◆ Visible + SWIR wideband sensor (0.4 μm to 1.7 μm)?
◆ Built-in timing adjustment circuit, H/V driver and serial communication circuit?
◆ Global shutter function?
◆ Input frequency?
37.125 MHz / 74.25 MHz / 54 MHz?
◆ Number of recommended recording?pixels: 640 (H) × 512 (V) approx. 0.33 M pixels?
Readout mode?
All - pixel scan mode ??
Vertical / Horizontal 1 / 2 Subsampling mode?
ROI mode?
Vertical / Horizontal‐Normal / Inverted readout mode?
◆ 8-bit / 10-bit / 12-bit A/D converter?
◆ Readout rate?
Maximum frame rate in?
All - pixel scan mode: 8bit : 258.80 frame/s, 10 bit: 240.61 frame/s, 12bit: 137.39 frame/s?
◆ Variable-speed shutter function (resolution 1 H units)?
◆ PGA function?
? ? ? ? 0 dB to 18 dB: Analog Gain (0.1 dB step)?
? ? ? ? 18.1 dB to 42 dB: Analog Gain: 18 dB + Digital Gain: 0.1 dB to 24 dB (0.1 dB step)?
◆ I/O interface?
SLVS (2 ch / 4 ch switching) output?
◆ Recommended exit pupil distance: –100 mm to –∞?
◆ Built-in digital thermometer?
◆ Built-in thermoelectoric cooler?
?

2、M2S090T

M2S090T是Microsemi公司Smartfusion系统的带SOC的FPGA，其架构如下图所示。

????????M2S090 内部包括主要分两部分，MSS和fabric，其中MSS即为一个cortext M3 ARM核和一些外围接口，fabric部分即为FPGA的逻辑部分。两部分之间可以通过AHB、APB进行通信，另外还有相互的中断信号可用。

????????下面就是Cache Controller Interfaces to Cortex-M3 Processor, AHB Bus Matrix, and MDDR Bridge

三、工程

本工程配置imx991 sensor 为主模式，SLVS 4channel，8bit数据，all scan，656*545分辨率

1、imx991寄存器配置

This sensor has a total of 5376 bytes of registers, composed of registers with address 00h to FFh that correspond to?Chip ID = 02h to 0Ch, 10h to 19h. Use the initial values for empty address. Some registers must be change from the?initial values, so the sensor control side should be capable of setting 5376 bytes.

配置寄存有两种总线：IIC和SPI，任选其一，本工程使用IIC总线，上图为寄存器说明的一部分，IIC总线和SPI总线操作地址有所不同。SPI总线时需要先chip ID然后再address；IIC总线就直接address。

工程里定义寄存器值取一部分，如下图所示

顶层接口的定义如下图所示

以下是IIC接口的例化

//====================================================================================
//
//-----接口总线
//
// IIC or SPI;  
//
//通过宏定义文件define.v内的宏变量来控制，当前使用IIC
//

	wire [1:0] isStart;
	wire [15:0] iic_rAddr;
	wire [7:0]  iic_WrData;
	assign isStart    = (sen_reg_sta==4'h0 || sen_reg_sta==4'h2 )? ( (Start_Sig == 1)? ((r_rw==1)?2'b10 : 2'b01) : 2'b00 ) : ((Start_Sig2 == 1)? ((r_rw2==1)?2'b10 : 2'b01) : 2'b00 );
	assign iic_rAddr  = (sen_reg_sta==4'h0 || sen_reg_sta==4'h2 )? rAddr   : conf_addr ;
	assign iic_WrData = (sen_reg_sta==4'h0 || sen_reg_sta==4'h2 )? WrData  : conf_data ;

	iic_bus U_iic
	 (
	      .CLK      ( i_clk      ),
		  .RSTn     ( i_rst_n    ),
		  .Start_Sig( isStart    ),
		  .Addr_Sig ( iic_rAddr  ),
		  .WrData   ( iic_WrData ),
		  .RdData   ( RdData     ),
		  .Done_Sig ( Done_Sig   ),
	      .SCL      ( o_i2c_scl  ),
		  .SDA      ( io_i2c_sdi )
	 );


	assign o_spi_cs   = 1;

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