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DS26519DK
2.
CLOCK JUMPERS
Jumpers JMP68 and JMP70 (middle left of board) select the main clock source for ports 1–8 and ports 9–16,
respectively. The source can be external via JMP67 (ports 1–8) or JMP69 (ports 9–16) or on-board oscillators Y2
(ports 1–8) and Y3 (ports 9–16). Oscillators Y4 and Y5 are auxiliary oscillators for ports 1–8 and ports 9–16,
respectively. The clock sources are muxed to the DS26519DK oscillators via FPGAs (see the ADDRESS MAP
section for details).
3.
LINE-SIDE CONNECTIONS
The DS26519DK provides four octal transformers, two stacked RJ48 connectors, and test points to support all 16
ports. The test points are clearly labeled on both sides of the transformers with port numbers.
4.
SYSTEM CONNECTORS
System-side signals can be accessed from 16 headers. The headers are clearly labeled with port and signal
information.
5.
MICROCONTROLLER
The microcontroller has factory-installed firmware in on-chip nonvolatile memory. This firmware translates memory
access requests from the RS-232 serial port into register accesses on the DS26519 and the FPGAs.
6.
POWER-SUPPLY CONNECTORS
Connect a 3.3V power supply across the red J2 and black J4 (GND) banana jacks for normal operation. Banana
jack J3 is used by the factory for application of programming voltage for the microcontroller. Diodes D1 and D2
provide protection against power connection reversal. The LED DS1 provides indications that a 3.3V supply is
connected properly. The 3.3V supply is regulated to supply proper voltages to various circuits on the board.
7.
CONNECTING TO A COMPUTER
Connect a standard DB-9 serial cable between the serial port on the DS26519DK and an available serial port on
the host computer. The host computer must be a Windows-based PC. Be sure the cable is a standard straight-
through cable rather than a null-modem cable. Null-modem cables prevent proper operation.
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