The components placed on it will be automatically placed on all signal layers, so we can use to place the pad or through-via Quickly place on all signal layers. This layer represents all signal layers. Note: If you want to auto-layout or auto-route some or all circuits, then you need to define at least one prohibited wiring area on the prohibited wiring layer. Usually, we place line segments (Track) or arcs (Arc) on the prohibited wiring layer to form a closed area, and it is only in this closed area that automatic component placement and automatic routing are allowed. (wiring prohibited layer) The prohibited wiring layer is used to define the area where components are placed. Others (other working level) In Protel 99 SE, in addition to the above working level, there are the following working levels: When placing PCB library components on a printed circuit board, the component number and outline will be automatically placed on the silkscreen layer.Ħ. The silk screen layer is mainly used to draw the outline of the component, the number of the placed component or other text information.
Silkscreen (silk screen layer) Protel 99 SE provides 2 silk screen layers, (top silk screen layer) and (bottom silk screen layer). For different requirements of different pads, you can also set multiple rules in the solder paste protective layer.ĥ. Similar to the solder mask, we also You can enlarge or shrink the solder paste protective layer by specifying an extension rule.
#Protel 99se board outline install
The role of solder paste protection layer and solder mask is similar, But when using "hot re-follow" (thermal convection) technology to install SMD components, the solder paste protective layer is mainly used to establish the silk screen of the solder mask. Protel 99 SE also provides two solder paste protection layers, namely (top paste protection layer) and (Bottom Paste) (bottom paste protection layer). For different requirements of different pads, in the solder mask Multiple rules can be set. Usually in order to meet the requirements of manufacturing tolerances, manufacturers often require a solder mask extension rule to enlarge the solder mask. The solder mask is negative, the solder placed on this layer Disks or other objects are copper-free areas. In Protel 99 SE, there are 2 solder masks: (Top Solder) and (Bottom Solder) (Bottom Solder). Masks (solder mask, solder paste protective layer) There can be 16 mechanical layers in Protel 99 SE: -, the mechanical layer is generally used to place indicative information about the system board and assembly methods, such as circuit board physical dimension lines, dimension marks, data materials, Hole information, assembly instructions and other information.Ĥ. It also allows the internal power / ground layer to be divided into multiple sub-layers, that is, each internal power / ground layer can have two or more power supplies, such as + 5V and + 15V, etc. Each internal power / ground layer can be given an electrical network name, and the printed circuit board editor will automatically connect this layer and other pads with the same network name (ie electrical connection relationship) in the form of pre-drawn wires. The traces or other objects placed on these levels are copper-free areas, that is, these working layers are negative (negative). Protel 99 SE provides 16 internal power / ground layers (referred to as internal electrical layers): -, these working levels are dedicated to the layout of power lines and ground lines.
Internal Planes (internal power / ground plane) The signal layer is positive (positive), that is, the traces or other objects placed on these working layers are copper-clad areas.Ģ. The signal layer is mainly used to place components (top and bottom) and traces. Signal Layers (Signal Layers) Protel 99 SE provides 32 signal layers, including (top layer), (bottom layer), (middle layer 1), (middle layer 2). The working layers provided by Protel 99 SE can be roughly divided into 7 categories: Signal Layers, Internal Planes, Mechanical Layers, Masks, and Silk screen Layer), Others (other working level) and System (system working layer), execute the menu command design / option during PCB design to set the visibility of each working layer.ġ. Only after understanding the functions of these working layers can the design of printed circuit boards be carried out accurately and reliably. Protel 99 SE provides multiple types of working layers.
Before we design the printed circuit board, the first step is to select the applicable working layer.
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