37.5.2.2 Scan Descriptors
The enhanced CVD module includes four scan descriptors to off-load the intervention requirements and timing dependencies of the CPU. Each scan descriptor includes the RX and TX indexes to be scanned and the strides for each, as well as the time for each measurement phase, the amount of oversampling and a threshold at which to act on the data.
Each descriptor indicates:
- RX indexes to be scanned
- TX indexes to be driven
- Number of RX indexes to scan at one time
- Number of TX indexes to scan at one time
- Independent enable for Self (RX-drive) and combination of Self and Mutual modes
- Channel timing control
- Oversampling or threshold support
- Provision to enable an interrupt when complete or when threshold exceeds
- The Enable mode settings to enable the single, continuous or continuous until threshold scanning