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15–6
Table 15–9. Comparator Block I/O Formats
(1)
Chapter 15: Arithmetic Library
I/O
O
Simulink
O1 [1]
(2) , (3)
O1: out STD_LOGIC
VHDL
Type
Implicit
(4)
Notes to Table 15–9 :
(1) For signed integers and signed binary fractional numbers, the MSB is the sign bit.
(2) [L] is the number of bits on the left side of the binary point; [R] is the number of bits on the right side of the binary point. For signed or unsigned
integers R = 0, that is, [L].[0]. For single bits, R = 0, that is, [1] is a single bit.
(3) I1 [L].[R] is an input port. O1 [L].[R] is an output port.
(4) Explicit means that the port bit width information is a block parameter. Implicit means that the port bit width information is set by the datapath
bit width propagation mechanism. To specify the bus format of an implicit input port, use a Bus Conversion block to set the width.
Figure 15–3 shows an example with the Comparator block.
Figure 15–3. Comparator Block Example
Counter
The Counter block is an up/down counter. For each cycle, the counter increments or
decrements its output by the smallest amount that DSP Builder can represent with the
selected bus type.
Table 15–10 shows the Counter block inputs and outputs.
Table 15–10. Counter Block Inputs and Outputs
Signal
data
sload
sset
updown
clk_ena
ena
sclr
q
Direction
Input
Input
Input
Input
Input
Input
Input
Output
Description
Optional parallel data input.
Optional synchronous load signal.
Optional synchronous set port. (Loads the specified constant value into the counter.)
Optional direction (1 = up; 0 = down).
Optional clock enable. (Disables counting and sload , sset , sclr signals.)
Optional counter enable. (Disables counting but not sload , sset , and sclr signals.)
Optional synchronous clear. (Loads zero into the counter.)
Result.
Table 15–11 shows the Counter block parameters.
Table 15–11. Counter Block Parameters
Name
Bus Type
[number of bits].[]
DSP Builder Handbook
Value
Signed Integer, Unsigned
Integer, Signed Fractional
>= 0 (Parameterizable)
Description
The bus number format that you want to use for the counter.
Specify the number of bits to the left of the binary point.
November 2013 Altera Corporation
Volume 2: DSP Builder Standard Blockset
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