SPRUJ28E November 2021 – September 2024 AM68 , AM68A , TDA4AL-Q1 , TDA4VE-Q1 , TDA4VL-Q1
The VFV calculator takes the unsigned extracted data through two FIR filters, each with a set of five coefficients (VCOEF1_x, where x = 0 to 4, in the VISS_RAWFE_H3A_VFV_CFG1 and VISS_RAWFE_H3A_VFV_CFG2 registers for FIR 1, and VCOEF2_x, where x = 0 to 4, in the VISS_RAWFE_H3A_VFV_CFG3 and VISS_RAWFE_H3A_VFV_CFG4 registers). Each coefficient is 8 bits wide with 4 bits of decimal (S8Q4). The filter outcome is downshifted by 4 bits and takes an absolute value to produce a 16-bit unsigned value. This is then sent to threshold VISS_RAWFE_H3A_VFV_CFG2[31:16] VTHR1 for FIR 1, and VISS_RAWFE_H3A_VFV_CFG4[31:16] VTHR2 for FIR 2, and square logic to produce VFV_n and VFV_sq_n.