MPC5553/MPC5554 Microcontroller Reference Manual, Rev. 5
2-38 Freescale Semiconductor
2.3.3 External Data Signals
The MPC5553/MPC5554 can be configured for 16-bit or 32-bit data bus operation.
2.3.3.0.1 External Data / GPIO
DATA[0:15]_GPIO[28:43]
DATA[0:15]_GPIO[28:43] are the EBI data signals. For 16-bit data bus operation, the data signals can be
divided into 0 through 7 for data, and 28 through 35 GPIO. These pins can be used as GPIO signals.
2.3.3.0.2 External Data / Ethernet Transmit Clock / Calibration Data / GPIO
DATA[16]_FEC_TX_CLK_CAL_DATA[0]_GPIO[44]
DATA[16]_FEC_TX_CLK_CAL_DATA[0]_GPIO[44] has the external data bus as the primary signal
function. The FEC transmit clock signal is the first alternate function, and the calibration data function is
the second alternate function. The FEC and calibration signals are mapped to the same ball, therefore
either the FEC or calibration function can be used, but not both. The FEC and calibration functions are not
available on the MPC5554. This pin can be used as a GPIO signal.
2.3.3.0.3 External Data / Ethernet Carrier Sense / Calibration Data / GPIO
DATA[17]_FEC_CRS_CAL_DATA[1]_GPIO[45]
DATA[17]_FEC_CRS_CAL_DATA[1]_GPIO[45] has the external data bus as the primary signal
function. The FEC carrier sense signal is the first alternate function, and the calibration data function is the
second alternate function. This pin can also be used as a GPIO signal. The FEC and calibration signals are
mapped to the same ball, therefore either the FEC or calibration function can be used, but not both. The
FEC and calibration functions are not available on the MPC5554. This pin can be used as a GPIO signal.
2.3.3.0.4 External Data / Ethernet Transmit Error / Calibration Data / GPIO
DATA[18]_FEC_TX_ER_CAL_DATA[2]_GPIO[46]
DATA[18]_FEC_TX_ER_CAL_DATA[2]_GPIO[46] has the external data bus as the primary signal
function. The FEC transmit error signal is the first alternate function, and the calibration data function is
the second alternate function. This pin can also be used as a GPIO signal. The FEC and calibration signals
are mapped to the same ball, therefore either the FEC or calibration function can be used, but not both. The
FEC and calibration functions are not available on the MPC5554. This pin can be used as a GPIO signal.
2.3.3.0.5 External Data / Ethernet Receive Clock / Calibration Data / GPIO
DATA[19]_FEC_RX_CLK_CAL_DATA[3]_GPIO[47]
DATA[19]_FEC_RX_CLK_CAL_DATA[3]_GPIO[47] has the external data bus as the primary signal
function. The FEC receive clock signal is the first alternate function, and the calibration data function is
the second alternate function. This pin can also be used as a GPIO signal. The FEC and calibration signals
are mapped to the same ball, therefore either the FEC or calibration function can be used, but not both. The
FEC and calibration functions are not available on the MPC5554. This pin can be used as a GPIO signal.
2.3.3.0.6 External Data / Ethernet Transmit Data / Calibration Data / GPIO
DATA[20]_FEC_TXD[0]_CAL_DATA[4]_GPIO[48]
DATA[20]_FEC_TXD[0]_CAL_DATA[4]_GPIO[48] has the external data bus as the primary signal
function. The FEC transmit data signal is the first alternate function, and the calibration data function is
the second alternate function. This pin can also be used as a GPIO signal. The FEC and calibration signals
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