SPRUIE9D May 2017 – May 2024 DRA74P , DRA75P , DRA76P , DRA77P
The PRM receives SYSBOOT[15:0] information from external pins sys_boot[15:0]. They are used to select interfaces or devices for the booting list. For more information, see Chapter 34, Initialization, Section 34.2.4, Sysboot Configuration .
Table 3-24 lists the external boot pins, signal names, their direction, the associated modules, description, and reset values of the signals. If the signal is input to the device, the module is the destination module for the signal; if the signal is an output from the device, the module is the source module of the signal.
| Pin | Signal | I/O (1) | PMWF Module | Description | Module Reset Value |
|---|---|---|---|---|---|
| sys_boot0 | SYSBOOT0 | I | PRM | System boot configuration pin 0: Latched at power-on reset (POR) | Z |
| sys_boot1 | SYSBOOT1 | I | PRM | System boot configuration pin 1: Latched at POR | Z |
| sys_boot2 | SYSBOOT2 | I | PRM | System boot configuration pin 2: Latched at POR | Z |
| sys_boot3 | SYSBOOT3 | I | PRM | System boot configuration pin 3: Latched at POR | Z |
| sys_boot4 | SYSBOOT4 | I | PRM | System boot configuration pin 4: Latched at POR | Z |
| sys_boot5 | SYSBOOT5 | I | PRM | System boot configuration pin 5: Latched at POR | Z |
| sys_boot6 | SYSBOOT6 | I | PRM | System boot configuration pin6: Latched at POR | Z |
| sys_boot7 | SYSBOOT7 | I | PRM | System boot configuration pin 7: Latched at POR | Z |
| sys_boot8 | SYSBOOT8 | I | PRM | System boot configuration pin 8: Latched at POR | Z |
| sys_boot9 | SYSBOOT9 | I | PRM | System boot configuration pin 9: Latched at POR | Z |
| sys_boot10 | SYSBOOT10 | I | PRM | System boot configuration pin 10: Latched at POR | Z |
| sys_boot11 | SYSBOOT11 | I | PRM | System boot configuration pin 11: Latched at POR | Z |
| sys_boot12 | SYSBOOT12 | I | PRM | System boot configuration pin12: Latched at POR | Z |
| sys_boot13 | SYSBOOT13 | I | PRM | System boot configuration pin 13: Latched at POR | Z |
| sys_boot14 | SYSBOOT14 | I | PRM | System boot configuration pin 14: Latched at POR | Z |
| sys_boot15 | SYSBOOT15 | I | PRM | System boot configuration pin15: Latched at POR | Z |
For proper device operation, sysboot14 must be tied to vss while sysboot15 is configurable. For more information, see Section 20.4.6.1.1.1, Permanent PU/PD disabling in Chapter 20, Control Module.