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OR3C80 Datasheet(PDF) 27 Page - Agere Systems |
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OR3C80 Datasheet(HTML) 27 Page - Agere Systems |
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27 / 210 page  Lucent Technologies Inc. 27 Data Sheet June 1999 ORCA Series 3C and 3T FPGAs Programmable Logic Cells (continued) PLC Routing Resources Generally, the ORCA Foundry Development System is used to automatically route interconnections. Interac- tive routing with the ORCA Foundry design editor (EPIC) is also available for design optimization. To use EPIC for interactive layout, an understanding of the routing resources is needed and is provided in this sec- tion. The routing resources consist of switching circuitry and metal interconnect segments. Generally, the metal lines which carry the signals are designated as routing seg- ments. The switching circuitry connects the routing segments, providing one or more of three basic func- tions: signal switching, amplification, and isolation. A net running from a PFU or PIC output (source) to a PLC or PIC input (destination) consists of one or more routing segments, connected by switching circuitry called configurable interconnect points (CIPs). The following sections discuss PLC, PIC, and interquad routing resources. This section discusses the PLC switching circuitry, intra-PLC routing, inter-PLC routing, and clock distribution. Configurable Interconnect Points The process of connecting routing segments uses three basic types of switching circuits: two types of con- figurable interconnect points (CIPs) and bidirectional buffers (BIDIs). The basic element in CIPs is one or more pass transistors, each controlled by a configura- tion RAM bit. The two types of CIPs are the mutually exclusive (or multiplexed) CIP and the independent CIP. A mutually exclusive set of CIPs contains two or more CIPs, only one of which can be on at a time. An inde- pendent CIP has no such restrictions and can be on independent of the state of other CIPs. Figure 18 shows an example of both types of CIPs. Key: C = configuration data. 5-5973(C) Figure 18. Configurable Interconnect Point 3-Statable Bidirectional Buffers Bidirectional buffers, previously described in the SLIC section of the programmable logic cell discussion, pro- vide isolation as well as amplification for signals routed a long distance. Bidirectional buffers are also used to route signals diagonally in the PLC (described later in the subsection entitled Intra-PLC Routing), and BIDIs can be used to indirectly route signals through the switching routing (xSW) segments. Any number from zero to ten BIDIs can be used in a given PLC. MULTIPLEXED CIP A B C O A B C O CD INDEPENDENT CIP A B CD B A = 2 |
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