NXP Semiconductors PXN2020 - 3.4.10.6 PK5 - GPIO (PK[5]); FlexRay Channel A Transmit Enable (FR_A_TX_EN); External Analog Mux Address Output (MA[2]); DSPI_C Peripheral Chip Select (PCS_C[3]); 3.4.10.7 PK6 - GPIO (PK[6]); FlexRay Channel B Receive (FR_B_RX); DSPI_B Peripheral Chip Select (PCS_B[1]); DSPI_C Peripheral Chip Select (PCS_C[4]); 3.4.10.8 PK7 - GPIO (PK[7]); FlexRay Channel B Transmit (FR_B_TX); DSPI_B Peripheral Chip Select (PCS_B[2]); DSPI_C Peripheral Chip Select (PCS_C[5]); 3.4.10.9 PK8 - GPIO (PK[8]); FlexRay Channel B Transmit Enable (FR_B_TX_EN); DSPI_B Peripheral Chip Select (PCS_B[3]); DSPI_A Peripheral Chip Select (PCS_A[1])

Signal Description
PXN20 Microcontroller Reference Manual, Rev. 1
3-38 Freescale Semiconductor
3.4.10.6 PK5 — GPIO (PK[5]) / FlexRay Channel A Transmit Enable
(FR_A_TX_EN) / External Analog Mux Address Output (MA[2]) / DSPI_C
Peripheral Chip Select (PCS_C[3])
PK[5] is a GPIO pin. FR_A_TX_EN in the FlexRay Channel A transmit enable pin. MA[2] is an address
output for an external analog multiplexer used to select the multiplexer input channel to connect to the
ADC. PCS_C[3] is a peripheral chip select output pin for the DSPI C module.
3.4.10.7 PK6 — GPIO (PK[6]) / FlexRay Channel B Receive (FR_B_RX) / DSPI_B
Peripheral Chip Select (PCS_B[1]) / DSPI_C Peripheral Chip Select
(PCS_C[4])
PK[6] is a GPIO pin. FR_B_RX in the FlexRay Channel B receive pin. PCS_B[1] is a peripheral chip
select output pin for the DSPI B module. PCS_C[4] is a peripheral chip select output pin for the DSPI C
module. PK[6] can be configured as a wakeup pin in the CRP_PWKENH register.
3.4.10.8 PK7 — GPIO (PK[7]) / FlexRay Channel B Transmit (FR_B_TX) / DSPI_B
Peripheral Chip Select (PCS_B[2]) / DSPI_C Peripheral Chip Select
(PCS_C[5])
PK[7] is a GPIO pin. FR_B_TX is the FlexRay Channel B transmit pin. PCS_B[2] is a peripheral chip
select output pin for the DSPI B module. PCS_C[5] is a peripheral chip select output pin for the DSPI C
module.
3.4.10.9 PK8 — GPIO (PK[8]) / FlexRay Channel B Transmit Enable
(FR_B_TX_EN) / DSPI_B Peripheral Chip Select (PCS_B[3]) / DSPI_A
Peripheral Chip Select (PCS_A[1])
PK[8] is a GPIO pin. FR_B_TX_EN in the FlexRay Channel B transmit enable pin. PCS_B[3] is a
peripheral chip select output pin for the DSPI B module. PCS_A[1] is a peripheral chip select output pin
for the DSPI A module.
3.4.10.10 PK9 — GPIO (PK[9]) / Clock Output (CLKOUT) / DSPI_D Peripheral Chip
Select (PCS_D[1]) / DSPI_A Peripheral Chip Select (PCS_A[2]) / Boot
Configuration (BOOTCFG)
PK[9] is a GPIO pin. CLKOUT is the external bus interface clock output (user mode only). PCS_D[1] is
a peripheral chip select output pin for the DSPI D module. PCS_A[2] is a peripheral chip select output pin
for the DSPI A module. During reset, BOOTCFG is an input to control certain boot options.