FTDI FT51A, Application Note

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Application Note
AN_289 FT51A Programming Guide
Version 1.0
Document Reference No.: FT_000962 Clearance No.: FTDI# 483
69
Product Page
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IOMUX Input Signals Value IOMUX Input Signals Value
FIFO_245_DATA_WRITE_6 34 GPIO_PORT0I_3 3
FIFO_245_DATA_WRITE_5 33 GPIO_PORT0I_2 2
FIFO_245_DATA_WRITE_4 32 GPIO_PORT0I_1 1
FIFO_245_DATA_WRITE_3 31 GPIO_PORT0I_0 0
FIFO_245_DATA_WRITE_2 30
Table 2.82 IOMUX Input Signal Mapping Values
2.9.9 Use Cases
The following use cases represent methods for mapping input and output signals to different pads.
It should be noted that the IOMUX mapping MUST be performed during configuration of the device
and not while the signals being mapped are active.
2.9.9.1 Setup an Input Signal
To program the IOMUX to route DIO_6 to the input signal UART_RXD.
 Select the signal:
o
Find UART_RXD in Table 2.82. Value is 17
decimal
.
o
Write 17
decimal
to
IOMUX_INPUT_SIG_SEL
.
 Select the pad:
o
Find the pad DIO_6 in Table 2.80. Value is 22
decimal
.
o
Write 22
decimal
to
IOMUX_INPUT_PAD_SEL
.
2.9.9.2 Setup an Output Signal
To program the IOMUX to route UART_TXD signal to the output pad DIO_8.
 Select the pad:
o
Find the pad DIO_8 in Table 2.80. Value is 24
decimal
.
o
Write 24
decimal
to
IOMUX_OUTPUT_PAD_SEL
 Select the signal:
o
Find UART_RXD in Table 2.81. Value is 18
decimal
.
o
Write 18
decimal
to
IOMUX_OUTPUT_SIG_SEL
.