NuMicro® NUC029LEE/NUC029SEE32-bit Arm® Cortex® -M0 MicrocontrollerAug, 2018 Page 165 of 497 Rev 1.00NUMICRO® NUC029LEE/NUC029SEE TECHNICAL REFERENCE MANUAL6.5.3 Block DiagramAHB BusEBIRegisterControllerExtBW16EBI StateMachineOutputControllerAD[15:0]Idle CycleTimingControllerEBI SignalTimingControllerExttALEExttACCExttAHDExttIR2RExttIW2XMCLKDividerMCLKDIVH_CLKMCLKEBI requestEBIAddress HitandRequestControllerExtENnCSnRDnWRALEFigure 6.5-1 EBI Block Diagram6.5.4 Functional Description6.5.4.1 EBI Area and Address HitThe EBI mapping address is located at 0x6000_0000 ~ 0x6001_FFFF and the maximumavailable memory space is 128 Kbytes. When the system request address hits EBI’s memoryspace, the corresponding EBI chip select signal (nCS) is assert and EBI state machine operates.For an 8-bit device (64 Kbytes), EBI mapped this 64 Kbytes device to 0x6000_0000 ~0x6000_FFFF and 0x6001_0000 ~ 0x6001_FFFF simultaneously.For a 16-bit device (128 Kbytes), EBI mapped this 128 Kbytes device to 0x6000_0000 ~0x6001_FFFF.6.5.4.2 EBI Data Width ConnectionThe EBI controller supports to connect the external device whose address bus and data bus aremultiplexed. For the external device with separated address and data bus, the connection todevice needs additional logic (latch device) to latch the address. In this case, pin ALE isconnected to the latch device to latch the address value. Pins AD0~AD15 for 16-bit data width /Pins AD0~AD7 for 8-bit data width are the input pins of the latch device, and the output pins ofthe latch device are connected to the Addr[15:0] of external device.
