What Does A Red Pokemon Card Mean

5 .- Layer Interconnect Routing and

In ASIC's modern use two, three or more levels of metal interconnect layers, this allows the cables crossing different layers in the same way we use copper in different layers of a printed circuit board. In a CMOS two-level connections to a standard cell inputs and outputs can be made using the second level of interconnect metal. As technology levels the connections can be for the same cell logic. In this way you can make a much more sophisticated routing taking the extra layer of metal layer in Figure 9 shows an example of the distribution of layers of an ASIC in this category.

Figure 9: View the profile of an ASIC

A connection that requires passing through a column of standard cells used a piece of metal that is used to pass a signal through a cell or an empty space in a cell, this is called "feedthrough" location can be seen in Figure 10.

Figure 10: Routing a CBIC Through a cell.

VDD and GND buses within the standard cell normally use the lowest level of interconnection. The width of each column of standard cells can be adjusted to align them using spacers. The power buses are interconnected vertical rails additional energy found in the second layer. Usually the designer can control the number and width of vertical power rails connected to the standard cells for the physical design of the device. A schematic diagram of the energy distribution of a CBIC can be seen in Figure 11.

Figure 11: Distribution clues to a cell.

All masks CBIC can be a configured, they can hold megaceldas such as SRAM, SCSI, MPEG decoders, and be located in the same IC with standard cells. The megaceldas libraries can be supplied by the company that makes the ASIC with full models that are much more advanced and are being tested. The ASIC libraries also provide flexible compilers to generate DRAM SRAM or ROM blocks.

For logic that operates on multiple signals through a data bus using standard cells may not be the style most efficient ASIC design. Some libraries provide ASIC data path compilers that automatically generate data path logic. A library of data path typically contains cells such as adders, subtracter, multiplier and ALU's.

Libraries of standard cells or gate array may contain hundreds of different logic cells, including combinational functions with multiple inputs, and latches and flip-flops with different combinations of reset, preset and clock options. Libraries ASIC companies, provide designers with a date book in electronic format with all functional descriptions along with the timing diagrams for each element contained in their libraries.