ZHCSNJ7A April 2021 – February 2023 TDES954
PRODUCTION DATA
When operating in CSI-2 V3Link input mode (with TSER953), the TDES954 receives CSI-2 formatted data on one or two V3Link input ports and forwards the data to the CSI-2 transmit port. The deserializer can operate in CSI-2 mode with synchronous back channel reference or non-synchronous mode. The forward channel line rate is independent of the CSI-2 rate in synchronous or non-synchronous with external clock mode. Each CSI-2 mode supports remapping of Virtual Channel IDs at the input of each receive port. This allows handling of conflicting VC-IDs for input streams from dual sensors and sending those streams to the same CSI-2 transmit port.
In CSI-2 mode each deserializer Rx Port can support a V3Link line rate up to 4.16 Gbps, where the forward channel and back channel rates are based on the reference frequency used for the serializer:
In Non-synchronous clocking mode, when the TSER953 uses internal clock mode, the serializer uses the internal Always-on Clock (AON) as the reference clock for the forward channel. The OSCCLK_SEL select bit in the TSER953 must be asserted (0x05[3]=1) to enable maximum data rate when using internal clock mode, and the CLK_OUT function must be disabled. A separate reference is provided to the image sensor or ISP. The CSI-2 rate must be lower than the line rate. For example, with the internal clock of 24.2 MHz, the V3Link forward channel rate is 3.872 Gbps and the CSI-2 throughput must be ≤ 3.1 Gbps (See TSER953 datasheet for more information).