SPD_DDR3_LRDIMM_TCDS
{ .sp_off = SPD_DDR3_LRDIMM_TCDS,
ASSERT3U(off, >, SPD_DDR3_LRDIMM_TCDS);
const uint8_t yen = si->si_data[SPD_DDR3_LRDIMM_TCDS];