31.2.1 External Bus Interface

The External Bus Interface (EBI) is an interface that features:

• Three external memory controllers:
  • a 16-bit Static Memory Controller (SMC)
  • a NAND Flash Controller (NFC)
  • a Multi-Port DDR-SDRAM Controller (MPDDRC) supporting 16-bit DDR3(L)/DDR2
• 8- or 16-bit data bus
• Up to 23-bit address bus
• Up to three chip selects with configurable assignment:
  • Static Memory Controller on NCS0, NCS1, NCS2
  • MPDDRC or Static Memory Controller on NCS1
  • Optional NAND Flash support on NCS2

The drive levels are configured in the EBI I/O Drive Configuration register (SFR_CCFG_EBICSA.EBI_DRIVE) in Special Function Registers (SFR). At reset, the selected drive is low. The user must make sure to program the correct drive. Refer to 67 Electrical Characteristics.