We are basing a design on the C667x EVM kit, and recently read the kit errata, which says:
"Alpha and Beta1 EVMs operate the CVDD at a fixed voltage and do not use Smart Reflex. A new UCD9222 configuration is needed to enable this. Beta2 EVMs support Smart Reflex. Version 4 of the UCD9222 configuration dated 31MAR must be loaded along with the UCD9222-48_6.3.9.12680 of later firmware. Version 4 of the UCD9222 configuration must not be loaded until after Version 10 (0xA) of the FPGA is loaded. Note that Beta1 EVMs can continue being used with a fixed voltage without loss of functionality."
We would really like to run CVDD on a fixed voltage and not on the SmartReflex supply - this woudl save us money, board space, and complexity.
However, the Keystone Hardware Design Guide says this:
"Unlike previous DSPs, the KeyStone devices require high performance power solutions. Remote sensing power supplies can be used – however Texas Instruments has developed a solution specifically designed for the variable core rail for this DSP family (KeyStone). The recommended solution (Section 5.7) is the only solution to be evaluated and guaranteed functional at this time. As others are evaluated they will be added to the acceptable list of approved supplies for the DSP variable core rail."
Can we get a firm answer on whether we can run CVDD at a fixed +1.0V voltage, and if there is a published list of approved supplies? Are there any particular specs that we would need to follow for a fixed supply?
