Daughter Card Interface - Spectrum Digital TMS320VC5509A EVM PLUS Technical Reference

Spectrum Digital, Inc

2.10 Daughter Card Interface

The 5509A EVM PLUS provides three expansion connectors that can be used to
accept plug-in daughter cards. The daughter card allows users to build on their 5509A
EVM PLUS platform to extend its capabilities and provide customer and application
specific I/O. The expansion connectors are for memory and peripherals.
The memory connector provides access to the DSP's asynchronous EMIF signals to
interface with memories and memory mapped devices. It supports byte addressing.
The peripheral connector brings out the DSP's peripheral signals like McBSPs, timers,
and clocks. Both connectors provide power and ground to the daughter card
Most of the expansion connector signals are buffered so that the daughter card cannot
directly influence the operation of the 5509A EVM PLUS board. The use of TI low
voltage, 5V tolerant buffers, and CBT interface devices allows the use of either +5V or
+3.3V devices to be used on the daughter card.
Other than the buffering, most daughter card signals are not modified on the board.
However, a few daughter card specific control signals like DC_RESET and
DC_DET exist and are accessible through the CPLD DC_REG register. The 5509A
EVM PLUS also multiplexes the McBSP2 for on-board or external use.
This function is controlled through the CPLD MISC register.
The timer signals on the peripheral expansion connector have connections for both
inputs and outputs. since the VC5509A does not have separate timer inputs and
outputs, the CPLD is used to select whether the input or output pin should be
connected to the timer. This selection is also controlled through the CPLD MISC
register.
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