Using an output to clock a clock block?

[kster59]

Is there any problems using an output pin to clock a clock block?

For example:

Code: Select all

out buffered port:1 p_dout = XS1_PORT_1E;
clock b_input = XS1_CLKBLK_4;
configure_clock_src(b_input,p_dclk);
configure_in_port(p_dout,b_input);
start_clock(b_input);

I looked at the SDRAM code and this seems to be what it is doing on ports P1I and P1J.

Is it also possible to use 1 bit of a 4 bit port as the clock source? So if p_dout=XS1_PORT_4E, can I use pin 0 of P4E to act as my clock source?

I would appreciate any insight into this. Thanks in advance.

[paul]

Is there any problems using an output pin to clock a clock block?

This is fine and can be very useful!

Is it also possible to use 1 bit of a 4 bit port as the clock source? So if p_dout=XS1_PORT_4E, can I use pin 0 of P4E to act as my clock source?

No, clock blocks can only be tied to 1 bit ports.