Xilinx V2.1 - Manual (Page 30)

30 Xilinx Development System
Xilinx System Generator v2.1 Reference Guide
input and output ports respectively. To configure the black box, enter the parameters
in the black box block parameters dialog box as shown in the figure below.
Figure 3-4: Customizing Clocks in the Black Box block parameters dialog box
These settings indicate that the black box should have clocks named fast_clk and
slow_clk . The fast_clk should have the same frequency as the samples presented
to input port #1, and the slow_clk should have the same frequency as output port
#1.
Concat
The Xilinx Concat block performs a concatenation of two bit vectors
represented by unsigned integer numbers, i.e. two unsigned numbers
with binary points at position zero.
The Xilinx Reinterpret block provides capabilities that can extend the
functionality of the Concat block.
Block Interface
The block has two input ports and one output port. The two input ports are labeled
hi and low . The number input to the hi port will occupy the most significant bits of
the output and the number that is input to the low port will occupy the least
significant bits of the output.
Block Parameters Dialog Box
The block parameters dialog box can be invoked by double-clicking the icon in your
Simulink model.
Figure 3-5: Concat block parameters dialog box
Parameters used by this block are explained in the Common Parameters section of the
previous chapter.
The Concat block does not use a Xilinx LogiCORE.