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5 / 49 page  4XLFN/RJLF &RUSRUDWLRQ ZZZTXLFNORJLFFRP (FOLSVH,,)DPLO\ 'DWD 6KHHW 5HY % Preliminary )LJXUH &DVFDGHG 5$0 0RGXOHV The RAM modules are dual-port, with completely independent READ and WRITE ports and separate READ and WRITE clocks. The READ ports support asynchronous and synchronous operation, while the WRITE ports support synchronous operation. Each port has 18 data lines and 10 address lines, allowing word lengths of up to 18 bits and address spaces of up to 1,024 words. Depending on the mode selected, however, some higher order data or address lines may not be used. The Write Enable (WE) line acts as a clock enable for synchronous write operation. The Read Enable (RE) acts as a clock enable for synchronous READ operation (ASYNCRD input low), or as a flow-through enable for asynchronous READ operation (ASYNCRD input high). Designers can cascade multiple RAM modules to increase the depth or width allowed in single modules by connecting corresponding address lines together and dividing the words between modules. A similar technique can be used to create depths greater than 512 words. In this case address signals higher than the ninth bit are encoded onto the write enable (WE) input for WRITE operations. The READ data outputs are multiplexed together using encoded higher READ address bits for the multiplexer SELECT signals. The RAM blocks can be loaded with data generated internally (typically for RAM or FIFO functions) or with data from an external PROM (typically for ROM functions). (PEHGGHG&RPSXWDWLRQDO8QLW (&8 Traditional Programmable Logic architectures do not implement arithmetic functions efficiently or effectively—these functions require high logic cell usage while garnering only moderate performance results. The Eclipse-II architecture allows for functionality above and beyond that achievable using programmable logic devices. By embedding a dynamically reconfigurable computational unit, the Eclipse-II device can address various arithmetic functions efficiently. This approach offers greater performance than traditional programmable logic implementations. The embedded block is implemented at the transistor level as shown in )LJXUH . WDATA RDATA RDATA WADDR WDATA RADDR RAM Module (2,304 bits) RAM Module (2,304 bits) |
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