C6416 EMIFA AECLKOUT Speed

Paul Secrest

I am running the C6416 DSP with a 50MHz CLKIN and using the x20 PLL to give 1GHz core clock. For EMIFA, I have the option to use internal CLKOUT4 or CLKOUT6. The ECLKIN spec has a minimum cycle time of 6 nS which is 166.7 MHz so CLKOUT6 is the only usable internal clock available. Looking at the ECLKOUT1 specification, the high and low pulse duration is 2.3 nS minimum (EH-0.7) and 3.7 nS maximum (EH+0.7).

This seems to say ECLKOUT1 will run from 135 MHz up to 217 MHz when CLKOUT6 is used.

I then get ECLKOUT2 will run from 74.6 MHz up to 94.3 MHz again using CLKOUT6.

Does this calculation seem correct?

over 10 years ago

0 Senthilkumar Srinivasan over 10 years ago

TI__Mastermind 43660 points

Paul,

The AECLKIN is an external clock which can be either AECLKIN or CPU/4 clock or CPU/6 clock. The AECLKOUT1 outputs the same input clock (AECLKIN or CPU/4 clock or CPU/6 clock). The AECLKOUT2 is a programmable clock which can be Programmable to be EMIFA input clock (AECLKIN, CPU/4 clock, or CPU/6 clock) frequency divided-by-1, -2, or -4.

Regards,
Senthil

0 Paul Secrest over 10 years ago in reply to Senthilkumar Srinivasan

Prodigy 60 points

My question was about the detailed timing given in the SPRS226M datasheet. Do you understand the timing specification given in the datasheet?

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C6416 EMIFA AECLKOUT Speed