The ZCZ_F packages offers an internally connected on-die OSPI flash module (ISSI IS25LX064-LWLA3 OSPI Flash device). Due to the internal connections, the ZCZ_F package comes with additional pin connection requirements. Please reference Pin Connectivity Requirements for pin connectivity requirements and ball names.
- The OSPI_D2 signal (pin L1) doubles as the active low Write Protect input for the internally connected flash device. Therefore, pin L1 must be connected to the relevant source (VDDS33) through a separate 4.7kΩ external pull resistor. This resistor must be placed as close to the device as possible.
- The OSPI_RESET_OUT0 signal (pin J3) must be connected to an open-drain equivalent of PORz in order to reset the on-die OSPI flash module. The open-drain requirement is to prevent a bus contention between the external PORz connection via pin J3 and the package internal connection between the AM263P and the OSPI flash device.
- The remaining pins internally connected for the on-die OSPI flash module should be left unconnected with no PCB traces:
- H1
- J1
- J4
- K2
- K3
- K4
- L2
- M1
- M4
- P1
- P3
Pleased see ZCZ_F Package OSPI Connection Requirements for a visualization of the necessary connections.