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UM0842 датащи(PDF) 32 Page - STMicroelectronics |
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UM0842 датащи(HTML) 32 Page - STMicroelectronics |
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32 / 50 page ![]() CPU board hardware description UM0842 32/50 Doc ID 16542 Rev 4 A.3.2 Switch 2 settings Note: 1 If SW2-1 and SW2-2 are both "OFF", B0 (pin PL_GPIO51) is in "HiZ state" and can be controlled from the application board. 2 If SW2-3 and SW2-4 are both "OFF", B1 (pin PL_GPIO52) is in "HiZ state" and can be controlled from the application board. 3 If SW2-5 and SW2-6 are both "OFF", B2 (pin PL_GPIO53) is in "HiZ state" and can be controlled from the application board. 4 If SW2-7 and SW2-8 are both "OFF", B3 (pin PL_GPIO54) is in "HiZ state" and can be controlled from the application board. 5 SW2-1 and SW2-2 "ON": INVALID Condition SW2-3 and SW2-4 "ON": INVALID Condition SW2-5 and SW2-6 "ON": INVALID Condition SW2-7 and SW2-8 "ON": INVALID Condition Table 33. Switch 2 settings Boot from SW2-1 SW2-2 SW2-3 SW2-4 SW2-5 SW2-6 SW2-7 SW2-8 USB_BOOT Off On Off On Off On Off On ETH (parameter from I2C ROM) On Off Off On Off On Off On ETH (parameter from SPI ROM) Off On On Off Off On Off On Serial NOR (default setting) On Off On Off Off On Off On Parallel NOR 8 (EMI with ACK) Off On Off On On Off Off On Parallel NOR 16 (EMI with ACK) On Off Off On On Off Off On Parallel NAND 8 Off On On Off On Off Off On Parallel NAND 16 On Off On Off On Off Off On Reserved for SPI Off On Off On Off On On Off Reserved for I²C On Off Off On Off On On Off UART_BOOT Off On On Off Off On On Off BootROM bypass On Off On Off Off On On Off Parallel NOR 8 (EMI without ACK) Off On Off On On Off On Off Parallel NOR 16 (EMI without ACK) On Off Off On On Off On Off Reserved Off On On Off On Off On Off Reserved On Off On Off On Off On Off |
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