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Could you clarify what do you mean by UDB capability?
If you are referring to the datasheet -> ordering information, it mentions the number of UDB blocks available in that device. eg: CY8C4247AZI-M485 -> has 4 UDB blocks present
Explore the architecture technical reference manual of the device being used by you. Head to the Universal Digital Blocks (UDBs) chapter. This chapter provides a detailed explanation about UDBs, their structure and their working. eg: 4200M architecture technical reference manual - chapter 16.