Chip-AD/DA Data Channel Using Invalid Bits for PCB Wiring Reduction
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Solution Overview
Problem
The increasing number of devices and channels on a PCB board necessitates more single-ended or differential pins for IO pin signals, leading to denser wiring and higher costs due to the need for additional interconnection lines and signal layers.
Innovation Solution
Utilize invalid bits in a second transmission channel to transmit customized data through a first transmission channel, eliminating the need for additional interconnection lines by incorporating control signals within the data stream, thereby simplifying the wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If additional IO pins are used to transmit control signals between chip and AD/DA converter, then control signal transmission capability is improved, but the number of interconnection lines and wiring complexity increases
Solution Approach 1:
The patent merges control signal transmission with data transmission by embedding control signals within the data transmission channel. Specifically, it utilizes idle or invalid bits in the JESD204B protocol data stream to carry control information, thereby combining two previously separate functions (data transmission and control signal transmission) into a single integrated channel, eliminating the need for additional dedicated IO pins and interconnection lines
Solution Approach 2:
The patent makes the data transmission channel universal by enabling it to perform multiple functions: transmitting both data payloads and control signals simultaneously. The control signals are encoded within the existing data transmission framework, allowing the same physical channel to serve dual purposes, thus improving versatility without increasing hardware complexity
2Quantity of substance
If more signal layers are added to PCB to support increased wiring, then signal transmission capacity is improved, but manufacturing cost and board complexity increase
Solution Approach 1:
The patent combines multiple signal transmission functions into existing PCB traces by utilizing protocol-level multiplexing. Control signals are superimposed on the data transmission channel through bit-level encoding, allowing existing PCB signal layers to carry both data and control information simultaneously, thereby maintaining signal transmission capacity without adding new PCB layers or increasing manufacturing complexity
3Reliability
If dedicated interconnection lines are created for control signals, then control signal reliability is improved, but the number of interconnection lines and board space increase
Solution Approach 1:
The patent merges control signal transmission into the existing data transmission interconnection lines by using idle bits in the data stream. This eliminates the need for separate dedicated interconnection lines for control signals, reducing the total number of traces required on the PCB while maintaining reliable control signal delivery through the shared channel
Solution Approach 2:
The patent introduces protocol-level encoding as an intermediary mechanism that allows control signals to be embedded within data transmission. The JESD204B protocol's idle and invalid bits serve as the intermediary carrier, enabling control information to be transmitted through the existing data channel without requiring separate physical interconnection lines
Data Source
AI summary
Provided are a data transmission method, a circuit board, a data transmission apparatus, a storage medium and an electronic apparatus. The data transmission method is applied between a chip and an analog-to-digital/digital-to-analog (AD/DA) converter and includes transmitting first data through a first transmission channel. The first transmission channel includes invalid bits in a second transmission channel, the second transmission channel is configured to transmit second data, the first data includes customized data, and the second data includes traffic data.