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10–2
Chapter 10: Adding a Board Library
Creating a New Board Description
Fixed-Size Bus Type
These components have a fixed-sized group of same type (either input or output) pins
with one FPGA pin assigned to each bit of the bus. DSP Builder offers the following
fixed-size bus type predefined components:
■
■
■
■
■
■
12-bit analog-to-digital converter ( A2D1Bit12 and A2D2Bit12 )
14-bit analog-to-digital converter ( A2D1Bit14 and A2D2Bit14 )
14-bit digital-to-analog converter ( D2A1 and D2A2 )
8-bit dual in-line package switch ( DipSwitch )
7-Segment display with a decimal point ( SevenSegmentDisplay0 to
SevenSegmentDisplay1 )
Simple 7-Segment display without a decimal point ( Simple7SegmentDisplay0 to
Simple7SegmentDisplay7 )
Selectable Single Bit Type
These components have a single bit, you can select the pin from a group of predefined
FPGA pins. Furthermore, the pin can be set as either input or output. DSP Builder
offers the following selectable single-bit predefined components:
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Debug pins ( DebugA and DebugB )
Prototyping pins ( PROTO , PROTO1 to PROTO3 )
Evaluation input pin ( EvalIoIn )
Evaluation output pin ( EvalIoOut )
Component Description File
To define a new component create a corresponding component file,
< component_name >.component, in the same folder as the predefined components.
The component description file contains a root element component that contains
several attributes and subelements that define the component. The component has the
following attributes:
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■
■
displayname= Specifies the name of the component, which the board description
file references.
direction= Specifies the direction of the signal. It can have the value of Input or
Output . You can omit this attribute for the Selectable Single Bit Type, because it is
set later.
type= Specifies the data type of the signal. The type can be BIT , INT , or UINT .
followed by the size in square brackets. For example, " BIT[1,0] " defines a single
bit while " UINT[12,0] " is a 12-bit unsigned integer.
The component subelements have the following definitions:
DSP Builder Handbook
Volume 2: DSP Builder Standard Blockset
November 2013 Altera Corporation
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