Analog Devices ADSP-21369 EZ-KIT Lite, Руководство пользователя

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ADSP-21369 EZ-KIT Lite Evaluation System Manual 2-3
ADSP-21369 EZ-KIT Lite Hardware Reference
The
CLKIN
pin of the processor connects to a 24.576 MHz oscillator. The
core frequency of the processor is derived by multiplying the frequency at
the
CLKIN
pin by a value determined by the state of the processor pins
CLKCFG1
and
CLKCFG0
. The value at these pins is determined by the state of
switch
SW2
state (see “Boot Mode and Clock Ratio Select Switch (SW2)”
on page 2-10 ). By default, the EZ-KIT Lite provides a core frequency of
393.216 MHz. It is possible to change the speed of the processor by
changing the value of the
PMCTL
register.
The
SW2
switch also configures the boot mode of the processor. The
EZ-KIT Lite is capable of EPROM/flash boot and SPI boot. By default,
the EZ-KIT Lite boots from flash memory. For details, see
“Boot Mode
and Clock Ratio Select Switch (SW2)” on page 2-10 .
External Port
The external port of the ADSP-21369 processor consists of a 24-bit
address bus, 32-bit data memory bus, and control lines. The control lines
are used to select, read, and write to external memory devices.
The external port connects to an 8-bit parallel flash memory, an 8-bit
SRAM memory, and a 32-bit SDRAM memory. See
“External Memory”
on page 1-11 for more information about accessing flash memory and
SDRAM memory.
All of the external port signals are available externally via the expansion
interface connectors (
J1—3
). The pinout of the connectors can be found in
“ADSP-21369 EZ-KIT Lite Schematic” on page B-1 .