topic Re: mpc8360 risc timer clocking in PowerQUICC Processors

mpc8360 risc timer clocking

eric2013 — Tue, 26 Nov 2013 19:49:50 GMT

In QEIWRM - 5.10.5 Timer Functional Description:

The clock input to the timer prescaler can be selected from the following sources:

• The system clock (ipg_clock)

• The system ‘slow go’ clock (ipg_clock internally divided by 16)

What does the "system clock" mean? Is it csb_clk, or ce_clk, or core_clk, or the PCI_CLK ( CLKIN not used)?

Thanks.

Re: mpc8360 risc timer clocking

LPP — Wed, 27 Nov 2013 08:16:21 GMT

ipg_clock is global IP clock. In case of MPC8360, ipg_clock = csb_clk

Re: mpc8360 risc timer clocking

eric2013 — Thu, 28 Nov 2013 17:17:16 GMT

Thanks. But I got one different answer from Technical Support that the "ipg_clock = one half of the QUICC Engine frequency" and the "QUICC Engine frequency" is the ce_clk.

Re: mpc8360 risc timer clocking

LPP — Tue, 03 Dec 2013 11:14:50 GMT

You are right. The link is QEIWRM Rev. 4.4, section 5.10.2.2 GTM Clock Source Modes.

Please accept my apology for this inconsistence.

Re: mpc8360 risc timer clocking

eric2013 — Tue, 03 Dec 2013 15:53:47 GMT

Thanks,LPP.