Yes, when performing dynamic reconfiguration of the CMU PLL to data rates above 4Gbps in Arria® V GX ES devices you need to execute additional transactions to complete the reconfiguration sequence.
The following pseudo-code provides an example of the additional transaction sequence required on the reconfiguration controller management interface.
- write_reg(0x030, 5); // Select the logical address of the CMU PLL ie 5
- write_reg(0x033, 0); // Write 0 to address register
- write_reg(0x034, 0); // Write 0 to data register
- write_reg(0x032, 1); // Trigger write operation
Refer to the Arria V ES Errata for other requirements when operating the CMU PLL above 4Gbps data rates.
This additional sequence is not required for Arria V GX production devices