SPRUJ28E November 2021 – September 2024 AM68 , AM68A , TDA4AL-Q1 , TDA4VE-Q1 , TDA4VL-Q1
The time stamp value is a 64-bit value that increments on each RCLK rising edge when CPTS_EN is set to 1. When CPTS_EN is cleared to 0, the time stamp value is reset to 0.
64-bit mode is selected via CPTS_CONTROL_REG[5] MODE_64BIT bit set to 1.
For test purposes, the time stamp can be written via the time stamp load function (CPTS_TS_LOAD_VAL_REG, CPTS_TS_LOAD_HIGH_VAL_REG, and CPTS_TS_LOAD_EN_REG).
The TS_ADD_VAL feature is included to allow 1-ns timestamp operations with an RCLK rate less than 1 GHz. Table 11-1 shows the RCLK and TS_ADD_VAL values for 1-ns operations. The highest RCLK frequency possible should be used as allowed by the silicon technology.
RCLK (MHz) | TS_ADD_VAL |
---|---|
1000 | 0 |
500 | 1 |
333.33 | 2 |
250 | 3 |
200 | 4 |
166.66 | 5 |
142.85714 | 6 |
125 | 7 |