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OR3T20-5S240 Datasheet(PDF) 30 Page - Agere Systems |
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OR3T20-5S240 Datasheet(HTML) 30 Page - Agere Systems |
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30 / 210 page  30 30 Lucent Technologies Inc. Data Sheet June 1999 ORCA Series 3C and 3T FPGAs Programmable Logic Cells (continued) BIDI Routing and SLIC Connectivity The SLIC is connected to the rest of the PLC by the bidirectional (BIDI) routing segments and the PFU out- put switching segments coming from the PFU output multiplexer. The BIDI routing segments (xBID) are labeled as BL for BIDI-left and BR for BIDI-right. Each set of BR and BL xBID segments is composed of ten bidirectional lines (note that these lines are diagramed as ten input lines to the SLIC and ten output lines from the SLIC that can be used in a mutually exclusive fash- ion). Because the SLIC is connected directly to the out- puts of the PFU, it provides great flexibility in routing via the xBID segments. The PFU routing segments, O[9:0], only connect to their respective line in the SLL, SUL, SUR, and SLR switching segment groups. That is, O9 only connects to SLL9, SUL9, SUR9, and SLR9. The BIDI lines provide the capability to connect to the other member of the routing set. That means, for example, that O9 can be routed to BR8 or BL8. This connectivity can be used as a means to distribute or gather signals on intra-PLC routing without disturbing inter-PLC resources. As described in the Switching Routing Seg- ments subsection, the BIDI routing segments are also used for routes to a diagonally adjacent PFU. In addition to the intra-PLC connections, the xBID and output switching segments also have connectivity to the x1, x5, and xL inter-PLC routing resources, provid- ing an alternate routing path rather than using PLC xSW segments. These connections also provide a path to the 3-state buffers in the SLIC without encumbering the xSW segments. In this manner, buffering or 3-state control can be added to inter-PLC routing without dis- turbing local functionality within a PFU. Control Signal and Fast-Carry Routing PFU control signal and the fast-carry routing are per- formed using the FINS structure and several dedicated routing paths. The fast-carry (FC) routing resources consist of a dedicated bidirectional segment between each orthogonal pair of PLCs. This means that a fast- carry can go to or come from each PLC to the right or left, above or below the subject PLC. The FINS struc- ture is used to control the switching of these fast-carry paths between the fast-carry input (FCIN) and fast- carry output (FCOUT) ports of the PFU. The PFU control inputs (CE, SEL, LSR, ASWE) and CIN can be reached via the FINS by two special routing segments, E1 and E2. The E1 routing segment pro- vides connectivity between all of the xBID routing seg- ments and the FINS. It is unidirectional from the BIDI routing to the FINS. E1 also provides connectivity to the PFU clock input via FINS for a local clock signal. The E2 segment connects the SLIC DEC output to the FINS and to a group of CIPS that provide bidirectional con- nectivity with all of the BIDI routing segments. This allows the DEC signal to be used in the PFU and/or routed on the BIDI segments. It also allows signals to be routed to the PFU on the xBID segments if the SLIC DEC output is not used. There is also a dedicated routing segment from the FINS to the SLIC TRI input used for BIDI buffer 3-state control. |
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