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EP2C8T144C8N Datasheet(PDF) 29 Page - Altera Corporation |
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EP2C8T144C8N Datasheet(HTML) 29 Page - Altera Corporation |
29 / 470 page Altera Corporation 2–3 February 2007 Cyclone II Device Handbook, Volume 1 Cyclone II Architecture Figure 2–2 shows a Cyclone II LE. Figure 2–2. Cyclone II LE Each LE’s programmable register can be configured for D, T, JK, or SR operation. Each register has data, clock, clock enable, and clear inputs. Signals that use the global clock network, general-purpose I/O pins, or any internal logic can drive the register’s clock and clear control signals. Either general-purpose I/O pins or internal logic can drive the clock enable. For combinational functions, the LUT output bypasses the register and drives directly to the LE outputs. Each LE has three outputs that drive the local, row, and column routing resources. The LUT or register output can drive these three outputs independently. Two LE outputs drive column or row and direct link routing connections and one drives local interconnect resources, allowing the LUT to drive one output while the register drives another output. This feature, register packing, improves device utilization because the device can use the register and the LUT for unrelated functions. When using register packing, the LAB-wide synchronous load control signal is not available. See “LAB Control Signals” on page 2–8 for more information. labclk1 labclk2 labclr2 LAB Carry-In Clock & Clock Enable Select LAB Carry-Out Look-Up Table (LUT) Carry Chain Row, Column, And Direct Link Routing Row, Column, And Direct Link Routing Programmable Register CLRN D Q ENA Register Bypass Packed Register Select Chip-Wide Reset (DEV_CLRn) labclkena1 labclkena2 Synchronous Load and Clear Logic LAB-Wide Synchronous Load LAB-Wide Synchronous Clear Asynchronous Clear Logic data1 data2 data3 data4 labclr1 Local Routing Register Chain Output Register Feedback Register Chain Routing From Previous LE |
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