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EPM9560 Datasheet(PDF) 9 Page - Altera Corporation |
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EPM9560 Datasheet(HTML) 9 Page - Altera Corporation |
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9 / 46 page  Altera Corporation 9 MAX 9000 Programmable Logic Device Family Data Sheet For registered functions, each macrocell register can be individually programmed for D, T, JK, or SR operation with programmable clock control. The flipflop can also be bypassed for combinatorial operation. During design entry, the user specifies the desired register type; the MAX+PLUS II software then selects the most efficient register operation for each registered function to optimize resource utilization. Each programmable register can be clocked in three different modes: ■ By either global clock signal. This mode achieves the fastest clock-to- output performance. ■ By a global clock signal and enabled by an active-high clock enable. This mode provides an enable on each flipflop while still achieving the fast clock-to-output performance of the global clock. ■ By an array clock implemented with a product term. In this mode, the flipflop can be clocked by signals from buried macrocells or I/O pins. Two global clock signals are available. As shown in Figure 2, these global clock signals can be the true or the complement of either of the global clock pins (DIN1 and DIN2). Each register also supports asynchronous preset and clear functions. As shown in Figure 3, the product-term select matrix allocates product terms to control these operations. Although the product-term-driven preset and clear inputs to registers are active high, active-low control can be obtained by inverting the signal within the logic array. In addition, each register clear function can be individually driven by the dedicated global clear pin (DIN3). The global clear can be programmed for active-high or active-low operation. All MAX 9000 macrocells offer a dual-output structure that provides independent register and combinatorial logic output within the same macrocell. This function is implemented by a process called register packing. When register packing is used, the product-term select matrix allocates one product term to the D input of the register, while the remaining product terms can be used to implement unrelated combinatorial logic. Both the registered and the combinatorial output of the macrocell can feed either the FastTrack Interconnect or the LAB local array. |
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Similar Description - EPM9560 |
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