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Hardware Paging -

The DSM module features memory address paging. The firmware controls two address lines to determine which one of four possible 17-bit address pages to use. With paging, you can have multiple waveforms that can be chirped with a switching time of less than 10 microseconds. With 1-page paging, you can only have one waveform but you will have the maximum of about 512k of memory addresses available to you. With 2-page paging, you can have two waveforms but you will only have about 256k of memory addresses available to you for each waveform. With 4-page paging, you can have the maximum of four waveforms but you will only have about 128k of memory addresses availabe to you for each waveform.

Please modify the board below to choose which paging you would like to have enabled. The locations of these resistors are near the middle of the board, just below the lower right corner of the HSRAM1 memory when viewed from the top.

To ensure proper operation of the DSM301A, one resistor on each of the two memory address lines allocated for paging [(either R34 or R36) and (either R35 or R37)] must be open while the other resistor of each pair must be shorted.

The following table is a summary of the different paging configurations:

Paging	R34	R35	R36	R37	Bits	Mem Addresses / Page	Waveforms
1-Page	Short	Short	Open	Open	19	524,288	1
2-Page	Short	Open	Open	Short	18	262,144	2
4-Page	Open	Open	Short	Short	17	131,072	4

Please complete both steps of the board modification when making changes to the paging option.

For 1-Page Paging

1. Remove surface mount resistors R36 and R37 from the bottom of the board.
2. Mount 0 ohm resistors (or short wires) at R34 and R35 on the top of the board.

For 2-Page Paging

1. Remove surface mount resistors R35 from the top of the board and R36 from the bottom of the board.
2. Mount 0 ohm resistors (or short wires) at R34 on the top of the board and R37 on the bottom of the board.

For 4-Page Paging

1. Remove surface mount resistors R34 and R35 from the top of the board.
2. Mount 0 ohm resistors (or short wires) at R36 and R37 on the bottom of the board.