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DSP56F803EVM Hardware User’s Manual
2.4 Clock Source
The DSP56F803EVM uses an 8.00MHz crystal, Y1, connected to its External Crystal
Inputs, EXTAL and XTAL. The DSP56F803 uses its internal PLL to multiply the input
frequency by 10 to achieve its 80MHz maximum operating frequency. An external
oscillator source can be connected to the DSP by using the oscillator bypass connectors,
JG3 and JG9; see
Figure 2-3. Schematic Diagram of the Clock Interface
2.5 Operating Mode
The DSP56F803EVM provides a boot-up MODE selection jumper, JG4. This jumper is
used to select the operating mode of the DSP as it exits RESET. Refer to the DSP56F803
User’s Manual for a complete description of the chip’s operating modes.
shows
the two operation modes available on the DSP56F803.
Table 2-2. Operating Mode Selection
Operating Mode
JG4
Comment
0
1–2
Bootstrap from internal memory (GND)
3
No Jumper
Bootstrap from external memory (+3.3V)
DSP56F803
EXTERNAL
OSCILLATOR
HEADERS
JG3
3
2
1
1
2
EXTAL
XTAL
JG9
8.00MHz
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