Visible to Intel only — GUID: sfo1410068753264
Ixiasoft
Visible to Intel only — GUID: sfo1410068753264
Ixiasoft
16.4.12. Clocks
There are two clock inputs to the quad SPI controller: l4_mp_clk and l4_main_clk; and one clock output: qspi_clk. The quad SPI flash controller uses the l4_mp_clk clock to clock the data slave transfers and register slave accesses. The l4_main_clk clock is the reference clock for the quad SPI controller and is used to serialize the data and drive the external SPI interface. The qspi_clk clock is the generated clock source for the connected flash devices.
- l4_main_clk should be greater than l4_mp_clk
- l4_main_clk must be greater than two times qspi_clk
The qspi_clk clock is derived by dividing down the reference clock, l4_main_clk clock by the baud rate divisor field (bauddiv) of the cfg register.