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Hardware Submodules
When jumpers J32 and J26 are installed, the MIC2026 can output a maximum of 500 mA 5V power to the
VBUS, working in the USB-host mode. When working in the device and otg mode, the J32 and J26 should
be disconnected.
3.8
FEC
The M5253 demo provides a 10/100M ethernet interface by an ethernet controller DM9000 on the CS1 of
the FlexBus. The board also provides the RJ45 connectors with integrated magnetics and LEDs. As there
is no EEPROM for the DM9000 on this board, there is no default MAC address configured for the M5253
demo board. The software takes the response to configure the MAC address of the DM9000 after powerup,
but Freescale has assigned an unique ethernet MAC address for each board and pasted it on the back of the
board. DM9000’s system address is at 0xE000_0300. The address index port is 0xE000_0300 and the data
port is 0xE000_0304. The DM9000’s interrupt pin (active high default) uses the system external interrupt
GPI5. The GPI5 L-H event is the second interrupt at controller number 37.
3.9
ATA
The M5253 demo board provides an ATA connector that interfaces with the MCF5253 processor’s ATA
interface. This board only supports one ATA device on the cable. To support a multi-ATA harddisk, the
CSEL signal on the board must be connected to the GND according to the ATA/ATAPI-6 specification,
because the board does not support it.
A device connected to the ATA interface must be powered by a separate supply (such as a peripheral power
connector provided by the ATX power supply).
3.10
Interrupts
The MCF5253 has a total number of seven external-interrupt input pins GPI0~6. Four of them are
connected to the push-button on the M5253 demo board and they are the GPI1~4’s. The GPI5 is reserved
for the ethernet controller DM9000. The GPI6 is reserved for customer usage. The external interrupt pins
are all multiplexed with other modules.
3.11
Timers
The MCF5253 contains a software watchdog timer and two 16-bit general-purpose timers (GPT).
The software watchdog timer provides a means of preventing the system from lockup due to uncontrolled
software loops via a special software-service sequence.
The two general-purpose timer modules (timer 0 and timer 1) in the MCF5253 can provide two
independent system interrupts, but only timer 1 can provide an output signal as TOUT1. It is multiplexed
with the SDATAO1.
M5253 Demo Board User Manual, Rev. 0
Freescale Semiconductor
7
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