The device provides several system clock outputs. Summary of these output clocks are as follows:
- WKUP_SYSCLKOUT0
- WKUP_PLL0_HSDIV0_CLKOUT
(PER_SYSCLK0) divided by 4 and sent out of the device as
WKUP_SYSCLKOUT0. This clock output is provided for test and debug
purposes only.
- WKUP_OBSCLK0
- This output can only be used as a functional clock source when
WKUP_OBSCLK_OUTMUX is used to select the direct output from
WKUP_HFOSC0.
- This output can only be
used for test and debug purposes when selecting any other clock
source.
- WKUP_CLKOUT0
- This output can only be
used as a functional clock source when WKUP_CLKOUTMUX is used to select
LFOSC0_CLKOUT, DEVICE_CLKOUT_32K, or the direct output from
WKUP_HFOSC0.
- This output can only be used for test and debug purposes when selecting
any other clock source.
- CLKOUT0
- CLKOUT0 is the Ethernet subsystem clock
(MAIN_PLL0_HSDIV6_CLKOUT) divided-by-5 or divided-by-10. This clock
output was provided as an optional source to the external PHY. When
configured to operate as the RMII Clock source (50MHz) the signal must
also be routed back to the respective RMII[x]_REF_CLK pin for proper
device operation.
- OBSCLK[1:0]
- These outputs can only be used as a functional clock sources when
OBSCLK0_CTRL is used to select the direct output from WKUP_HFOSC0.
- These outputs can only be
used for test and debug purposes when selecting any other clock
source.
- AUDIO_EXT_REFCLK[1:0]
- Option of sourcing one of
six McASP high-frequency audio reference clocks,
MAIN_PLL0_HSDIV8_CLKOUT, or WKUP_PLL0_HSDIV1_CLKOUT when configured to
operate as an output.