Analog Devices ADSP-2189M EZ-KIT Lite, Manual, Page: 57 / 81

ADSP-2189M EZ-KIT Lite Evaluation System Manual 3-15
EZ-KIT Lite Hardware Reference
The EZ-KIT Lite board is an example of a minimum implementation of
an ADSP-2189M processor. The Flash EPROM is connected to the pro-
cessor via the Byte DMA Port. This interface uses only eight of the
24 data lines to carry data (
D8
through
D15
). Eight of the spare data lines
(
D16
through
D23
) are used to provide additional address bits. This allows
the ADSP-2189M to address up to 32 Mbits (4 Mbytes) of memory. The
DSP is configured to boot from the Flash EPROM when
RESET
is
de-asserted or if power is applied to the board.
The AD73322 codec is connected to the DSP via
SPORT0
. This high speed
synchronous serial port carries all of the data, control, and status informa-
tion between the DSP and the codec. It is possible to disable the codec if
the serial port is to be used for another purpose. When the jumper (
JP1
) is
shorted, the codec is disabled and its signals are put in a high impedance
state.
The
SPORT1
pins are used to communicate with the host PC via the
RS-232 interface (
P8
). The
Flag In
and
Flag Out
pins carry the receive
and transmit data. Software running on the DSP emulates a UART to
provide the proper protocol for asynchronous serial communications up to
a data rate of 115K bits per second.
Hardware Debugging
If the green LED fails to light, check your power connections. Verify that
your power supply has the proper size connector and that the polarity is
correct. The power supply voltage measured at the connector to the board
should be 8V to 10V DC. Also, make sure that there are no objects
beneath or on top of the board that may be causing a short circuit. Hit the
reset button (
SW1
) if the board appears to be operating improperly.