Motorola DSP56824ADM, User Manual, Page: 32 / 58

2-16 DSP56824ADM User’s Manual MOTOROLA
DSP56824ADM Technical Summary
Jumper Configuration
Note: The DSP56824ADM is factory configured with PB14 operating as an output to
drive LED2.
2.6.9 Power Input Selection
Jumper group JG14 is used to select the input voltage source to the DSP56824ADM
board. See Table 2-12 for JG14 configuration information.
2.6.10 Reset Control Selection
Jumper group JG15 is used to select the source of the DSP56824’s RESET signal. See
Table 2-13
for JG15 configuration information.
2.6.11 PB15 Pull Up/Pull Down Selection
Jumper group JG10 is used to pull up or down the dual-function signal pin PB15 for DSP
reading at reset. This is required to compensate for nonlinear frequency response in the
clock circuit. For clock frequencies in the range of 32 KHz–2 MHz, JG10 1–2 should be
jumpered to pull down PB15. For clock frequencies in the range of 2 MHz maximum
DSP frequency, remove the jumper to pull up PB15. See Table 2-14 for PB15
configuration information.
Table 2-12 Power Input Selection
Configuration JG14 Comment
0 (default) 3–4, 5–6, 7–8 9–12 VDC from power jack J7 to on-board voltage regulators
1 1–3, 6–8 User voltage from power jack J7 directly to V
CC
and V
DD
power planes (on-board voltage regulators are bypassed)
Table 2-13 RESET Selection
Configuration JG15 Comment
0 (default) 1–2 On-board 3.3 V reset logic
1 NC Reset from external source:
• Expansion connector J2
• JTAG/OnCE connector J3