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A B O U T T H E M O D U L E
1
Interfaces
General purpose
The module provides two 8-bit ports (PORTA and PORTC) for digital I/O. These 16
I/O (GPIO)
pins are multiplexed with other functions such as serial communication, external
DMA, or other, special functions. You can configure all pins individually as inputs or
outputs, with these exceptions:
Note:
Serial
The module implements two independent serial channels that operate in these
communication
modes:
The pins for the two serial channels are multiplexed with the 16 GPIO (general
purpose I/O) pins.
The serial channel voltage level is 3.3V. For RS232 or RS485 communication, you
must use external drivers.
Serial EEPROM /
The module has a 8KB EEPROM with an I
2
I
C
configuration data, such as the MAC address for the Ethernet controller.
Two GPIO pins — PORTC2 and PORTC6 — act as the I
2
I
C device to these pins as long as the pins do not use address 0xA0 or 0xA1. These
addresses are used by the 8KB EEPROM on the module.
JTAG interface
The JTAG interface is used primarily for debug purposes. The five JTAG pins — TCK,
TMS, TDI, TDO, and TRST# — are multiplexed with five address lines (ADDR5 through
ADDR9) and are available on pins 2 through 6 on the module's DIL-48.
ConnectCore 7U Hardware Reference, Rev A 01/2007
4
PORTC2 is hardwired for use as I2C_SDA.
PORTC6 is hardwired for use as I2C_SCL.
PORTC4 provides a reset output until the startup code initializes the port pin.
PORTC4 outputs a reset pulse that remains in output mode as active high until
the code sets it otherwise
You can use pins C0, C1, and C3 to generate a level-sensitive interrupt to the
ARM core's IRQ signal.
UART (universal asynchronous/synchronous receive/transmitter) mode. This
mode operates at speeds up to 230 kbps, with 5 to 8 data bits; odd, even, or no
parity; and 1 or 2 stop bits.
SPI (serial peripheral interface) mode. Use this full-duplex, synchronous 4-
wire interface to connect different peripherals to the module.
Note:
The NS7520 supports SPI master mode only.
Serial port A is on PORTA, with all eight signals available: RxD, TxD#, RTS#,
CTS#, DCD#, RI#, DSR#, and DTR#.
Serial port B is on PORTC, with six signals available: RxD, TxD#, RTS#, CTS#,
DCD#, and RI#. The remaining two pins are reserved for I
2
C use.
2
C interface to provide storage for
2
C bus. You can connect any 3.3V
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