The Arasan MIPI CSI-2 Transmitter IP Core functions as a MIPI Camera Serial Interface between a peripheral device (display module) and a host processor (baseband, application engine). The Arasan MIPI CSI-2 Transmitter IP provides a standard, scalable, low-power, high-speed interface that supports a wide range of higher image resolutions.
Pixel Data received from over the Camera Sensor Bus is packed into bytes by the Transmitter IP. The packing of the pixel into bytes follows the CSI-2 specification and based on the pixel format support. This IP calculates and appends an ECC/CRC value to a short packet (or) to the header of a long packet. Selection of ECC/CRC to the header is done based on the PHY connected. For the payload of a long packet carrying pixel data, this IP calculates its CRC value and appends it to the packet as a Packet Footer (PF). The packet is buffered in a FIFO and sent to one or more D-PHY/C-PHY depending on the lane distribution scheme set by the camera sensor/user.
Arasan MIPI CSI-2 Transmitter is compliant with MIPI CSI-2 specification v2.1 and supports DPHY v2.1 and the MIPI C-PHY v1.2.
Arasan offers the C-PHY in a combination configuration that supports both C-PHY interfaces and D-PHY interfaces. Our implementation makes efficient use of the high frequency signally pins for a minimal overhead to support both physical interfaces.
Diagram
Features
Use of either D-PHY/C-PHY by user configuration
Lane is configurable depending on the bandwidth requirements of the application, up to 8-lanes for DPHY and up to 3-lanes for C-PHY
Connectivity to DPHY/CPHY through MIPI PPI Interface
High Speed (HS) transmit rates of 182Mbps to 6840Mbps (3Gsps) per lane with C-PHY interface
High Speed (HS) receiver rates of 80Mbps to 1500Mbps per lane without calibration, 1500Mbps to 2500 Mbps with skew calibration and 2500Mbps to 4500Mbps with equalization in D-PHY interface
Supports for Ultra Low Power Mode (ULPS)
Supports for Alternate Low Power State (ALPS) in CPHY mode
Support for Continuous and Non-Continuous Clock Mode
Pixel formats supported
RAW data type
YUV data type
RGB data type
All user Defined data types / JPEG
Generic 8-bit long packet data types
Supports Data Type Interleaving
Supports Virtual Channel Interleaving
Pixel Level Input Interface for Image Sensor
Supports Header and Payload Checksum
Configurable for two mode of operation
Store and Forward Mode – Stores the full pixel packet before forwarding.
Cut through Mode – Initiates the HS transmission to D/CPHY as soon as the pixel information is received. Makes use of very shallow memory.
Supports Multi Pixel Mode – Multiple Pixels per clock to bring down the sensor clock frequency to support higher resolution applications
PPI Data Lane swapping as per user configuration
Optional support for Compressed data formats
Host interface for register configuration and monitoring,
Used for programming both CSI-2 and PHY related registers. Reserved address space [0x00 – 0x0F] for the PHY related registers.
Optional support for the AHB/APB Interface
Deliverables
Verilog HDL of the IP core
User guide
Synthesis scripts
Lint report
CDC report
Verilog test suite
Gate count estimation available upon request
Benefits
Fully compliant to MIPI standard
Small footprint
Code validated with Spyglass
Functionality ensured with comprehensive verification
Product quality proven with silicon
Premier direct support from Arasan IP core designers
VIDEO Demo - Arasan CPHY/DPHY Combo Compliance Tester
