MPC8280 MODCK管脚硬件未处理会怎样？

[lhb_will]

如题

[ufedor]

Please pose question in English.

[lhb_will]

My question is "What happens if the MPC8280 MODCK pin hardware is not processed?" You can also use https://translate.google.cn/ to translate, and the previous questions are also in Chinese.

[ufedor]

> MODCK pin hardware is not processed

What does it mean?

[lhb_will]

Because MODCK and BNKSEL are pin-multiplexed, and my hardware design does not distinguish between these two signals, it causes MODCK to be directly connected to the SDRAM pin. What effect will this have?

[ufedor]

In the MPC8280 PowerQUICC II Family Reference Manual, Table 4-12. SIUMCR Register Field Descriptions it is written:

“Note that during power on reset the MODCK pins are used for PLL configuration.”

Concerning the MODCK[1:3] POR function refer to the MPC8280 PowerQUICC II Family Hardware Specifications, 7 Clock Configuration Modes.

Also, it is possible to use attached schematics as reference.

[lhb_will]

I see the relevant information, but if the SCMR is stable after each power-up is 0x11310003 value. Can you assume that my hardware design is temporarily no problem?

[ufedor]

Please send the schematics as searchable PDF for inspection and measure POR voltages of the MODCK[1:3].