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The image sensor used is a CMOSIS CMV2000. The data is read out using low voltage differential singling (LVDS) and controlled using SPI. For maximum quantum efficiency (QA), the variation of the sensor processed on 12um epitaxial (E12) SI wafer is used. The thicker epic-layer increases the sensitivity to light above 600nm significantly. Due to the sensitivity due to high speed data transfer, the data lines are carefully impedance matched following the TIA/EIA 644 standard for LVDS signals.
Clock Generation
Control Pins
The following pins are connected to the Program System (PS) part of the FGPA and are used to control the sensor functionality.
| PicoZed Pin | Net Name | Functionality | Comment | ||||
|---|---|---|---|---|---|---|---|
| JX2-8 | PS_MIO_9 | OE | |||||
| JX2-1 | PS_MIO_10 | T_EXP1 | |||||
| JX2-6 | PS_MIO_11 | T_EXP2 | |||||
| JX2-5 | PS_MIO_12 | Frame Request | |||||
| JX2-2 | PS_MIO_13 | SYS_RES_N | |||||
| JX3-41 | PS_MIO_46 | SPI Mosi | |||||
| JX3-40 | PS_MIO_47 | SPI Miso | |||||
| JX3-42 | PS_MIO_48 | SPI Clock | |||||
| JX3-44 | PS_MIO_49 | SPI Enable | PS_MIO_51 | UART Selector |
Data Pins
The following pins are connected to the Program Logic (PL) part of the FGPA and are used to read out data from the sensor.
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SD Card Interface
| PicoZed Pin | Net Name | Functionality | Comment |
|---|---|---|---|
| JX3-43 | PS_MIO_40 | Clock | |
| JX3-34 | PS_MIO_41 | Commands | |
| JX3-37 | PS_MIO_42 | Data0 | |
| JX3-36 | PS_MIO_43 | Data1 | |
| JX3-39 | PS_MIO_44 | Data2 | |
| JX3-48 | PS_MIO_45 | Data3 | |
| JX3-66 | PS_MIO_50 | CD |
USB-UART Connection
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Because of limited MIO pins available the USB-UART is shared with the bus connector UART. A 2-channel single-pole double throw (SPDT) bidirectional switch is used to switch between the two connectors. By default it's routed to the USB-UART but by setting pin PS_MIO_51 high the data is routed to pin 3 and 4 on the bus connector.
| PicoZed Pin | Net Name | Functionality | Comment |
|---|---|---|---|
| JX2-3 | PS_MIO_14 | TX | |
| JX2-4 | PS_MIO_15 | RX | |
| JX3-64 | PS_MIO_51 | SPDT Switch | Set to '0' for USB and '1' for bus connector |
USB 2.0 Connection
| PicoZed Pin | Net Name | Functionality | Comment |
|---|---|---|---|
| JX3-67 | USB_OTG_P | Data+ | |
| JX3-69 | USB_OTG_N | Data- |
External Connector (Bus Connector)
| Connector Number | PicoZed Pin | Functionality | Comment | |
|---|---|---|---|---|
| 1 | - | 3.3V Supply | Can power small peripherals or be used as reference voltage | |
| 2 | PG_CARRIER | |||
| 3 | UART RX | |||
| 4 | UART TX | |||
| 5 | JX1-6 | CARRIER_RST | ||
| 6 | PWR_ENABLE | |||
| 7 | JX2-10 | VCCIO_EN | ||
| 8 | - | Ground pin |
JTAG Connector
| PicoZed Pin | Net Name | Functionality | Comment | ||
|---|---|---|---|---|---|
| JX1-1 | JTAG_TCK | ||||
| JX1-2 | JTAG_TMS | ||||
| JX1-3 | JTAG_TDO | ||||
| JX1-4 | JTAG_TDI | ||||
| JX1-6 | CARRIER_RST | INIT |
LED Indicators
Board Outline and Material
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