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EP1C4T400I6ES Datasheet(PDF) 10 Page - Altera Corporation |
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EP1C4T400I6ES Datasheet(HTML) 10 Page - Altera Corporation |
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10 / 106 page  2–4 Altera Corporation Preliminary May 2008 Cyclone Device Handbook, Volume 1 performance and flexibility. Each LE can drive 30 other LEs through fast local and direct link interconnects. Figure 2–3 shows the direct link connection. Figure 2–3. Direct Link Connection LAB Control Signals Each LAB contains dedicated logic for driving control signals to its LEs. The control signals include two clocks, two clock enables, two asynchronous clears, synchronous clear, asynchronous preset/load, synchronous load, and add/subtract control signals. This gives a maximum of 10 control signals at a time. Although synchronous load and clear signals are generally used when implementing counters, they can also be used with other functions. Each LAB can use two clocks and two clock enable signals. Each LAB's clock and clock enable signals are linked. For example, any LE in a particular LAB using the labclk1 signal will also use labclkena1. If the LAB uses both the rising and falling edges of a clock, it also uses both LAB-wide clock signals. Deasserting the clock enable signal will turn off the LAB-wide clock. Each LAB can use two asynchronous clear signals and an asynchronous load/preset signal. The asynchronous load acts as a preset when the asynchronous load data input is tied high. LAB Direct link interconnect to right Direct link interconnect from right LAB, M4K memory block, PLL, or IOE output Direct link interconnect from left LAB, M4K memory block, PLL, or IOE output Local Interconnect Direct link interconnect to left |
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