Primitive Assembly Unit

Product Specifications

Technical details and manufacturing context for Primitive Assembly Unit

Definition

The Primitive Assembly Unit is a critical sub-component of a Geometry Processor in computer graphics systems. It receives processed vertex data and assembles them into geometric primitives (such as points, lines, triangles) according to specified topology. This unit prepares the assembled primitives for subsequent stages like rasterization, ensuring proper geometric structure and connectivity for rendering operations. The unit operates by receiving vertex data streams from the vertex processing stage, grouping vertices according to primitive topology specifications (e.g., triangle strips, fans, lists), performing primitive assembly by connecting vertices, and outputting complete geometric primitives. It handles primitive restart indices, maintains vertex order, and may perform basic culling operations before passing assembled primitives downstream. The unit is typically fabricated on silicon with copper interconnects, and its electrical and mechanical parameters are specified for industrial environments. Key parameters include supply voltage (3.3–5 V DC), power consumption (0.5–2 W), clock frequency (100–500 MHz), primitive assembly rate (100–1000 M primitives/s), assembly precision (±0.01 mm), operating temperature (-40–85 °C), storage temperature (-55–125 °C), relative humidity (5–95% non-condensing), ingress protection (IP40–IP65), material (FR4, CEM-1), weight (5–20 g), and footprint (10×10–20×20 mm). These values are reference ranges and must be confirmed for the specific model and application. Standards such as IEC 60068-2-1, IEC 60068-2-2, IEC 60068-2-78, IEC 60529, and IPC-4101 are listed as procurement references, not as certifications. For accurate specifications, consult the legal manufacturer or supplier.

Working Principle

The unit receives vertex data streams from the vertex processing stage, groups vertices according to primitive topology specifications (e.g., triangle strips, fans, lists), performs primitive assembly by connecting vertices, and outputs complete geometric primitives. It handles primitive restart indices, maintains vertex order, and may perform basic culling operations before passing assembled primitives downstream.

Common Materials

Silicon, Copper

Technical Parameters

Parameter	Typical range	Notes & selection driver
Supply Voltage	3.3–5 V DC	Logic level for I/O interfaces
Power Consumption	0.5–2 W	Depends on clock frequency and load
Clock Frequency	100–500 MHz	Higher frequency increases throughput
Primitive Assembly Rate	100–1000 M primitives/s	Peak assembly throughput
Assembly Precision	±0.01 mm	Positioning tolerance for primitives
Operating Temperature	-40–85 °C	Extended temperature range for industrial useIEC 60068-2-1, IEC 60068-2-2
Storage Temperature	-55–125 °C	Non-operating survival rangeIEC 60068-2-1, IEC 60068-2-2
Relative Humidity	5–95 %	Non-condensingIEC 60068-2-78
Ingress Protection	IP40–IP65	Higher IP for harsh environmentsIEC 60529
Material	FR4, CEM-1	PCB substrate; lead-free solderableIPC-4101
Weight	5–20 g	Depends on package and heatsink
Footprint	10×10–20×20 mm	Package size (L×W)

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Vertex Buffer Interface Part
Receives and buffers incoming vertex data from previous processing stages

Material: Silicon
Topology Decoder
Interprets primitive topology information to determine vertex grouping rules

Material: Silicon
Assembly Logic Unit
Performs the actual primitive assembly by connecting vertices according to topology

Material: Silicon
Output Buffer
Stores assembled primitives before transmission to next processing stage

Material: Silicon

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Geometry Processor

View system integration details

Manufacturers of Primitive Assembly Unit

Manufacturer profiles associated with Primitive Assembly Unit.

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Frequently Asked Questions

What is the function of the Primitive Assembly Unit?

It assembles processed vertex data into geometric primitives like points, lines, and triangles according to specified topology, preparing them for rasterization.

What are the typical electrical parameters?

Supply voltage is 3.3–5 V DC, power consumption 0.5–2 W, clock frequency 100–500 MHz, and primitive assembly rate 100–1000 M primitives/s. These are reference ranges; confirm with the manufacturer.

What environmental conditions can it withstand?

Operating temperature is -40 to 85 °C, storage -55 to 125 °C, relative humidity 5–95% non-condensing, and ingress protection IP40–IP65. Verify for your application.

What standards are referenced for this component?

IEC 60068-2-1, IEC 60068-2-2, IEC 60068-2-78, IEC 60529, and IPC-4101 are listed as procurement references. They are not certifications; check compliance with the supplier.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	0 to 10 bar
other spec:	Max primitive assembly rate: 1 million primitives/second
temperature:	-20°C to +85°C

Product Specifications

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