Sundance FC100 - Manual (Page 9)

4.3.5 Parameters and ports definition
The core signal I/O have not been fixed to specific device pins to provide flexibility for
interfacing with user logic. Descriptions of all I/O signals are provided hereunder:
Signal
Signal
Direction
Description
CLK Input Clock Input.
Single source used for all I/O and internal clocking.
RST_N Input Active-low asynchronous reset.
Resets all control logic.
DIR Input Transform mode select.
0 = Forward FFT, 1 = Inverse FFT.
SEL[3:0] Input Transform length select.
Valid range is from 4'd5 (indicating transform length of 32)
up to the maximum length supported by the build (e.g. 4'd10 for
a transform length of 1024). Number of SEL bits is dependent
on the maximum length.
SYNC_IN Input Input sync strobe.
Indicates to the core to begin processing i_data on the
following clock cycle.
A[63:0] Input Input data
Complex data of the form R + iQ, where R is contained in
bits 63:32 and Q is contained in bits 31:0, each a single-precision
floating point number.
SYNC_OUT Output Output sync strobe.
Indicates the core is sending processed o_data beginning on
the following clock cycle.
X[63:0] Output Output data.
Complex data of the form R + iQ, where R is contained in
bits 63:32 and Q is contained in bits 31:0, each a single-precision
floating point number.
User Manual FC100 Page 9 of 12 Last Edited: 25/11/2008 15:00:00