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LC5768MB-4F208C Datasheet(PDF) 10 Page - Lattice Semiconductor |
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LC5768MB-4F208C Datasheet(HTML) 10 Page - Lattice Semiconductor |
10 / 92 page Lattice Semiconductor ispXPLD 5000MX Family Data Sheet 10 True Dual-Port SRAM Mode In Dual-Port SRAM Mode the multi-function array is configured as a dual port SRAM. In this mode two independent read/write ports access the same 8,192-bits of memory. Data widths of 1, 2, 4, 8, and 16 are supported by the MFB. Figure 9 shows the block diagram of the dual port SRAM. Write data, address, chip select and read/write signals are always synchronous (registered.) The output data sig- nals can be synchronous or asynchronous. Resets are asynchronous. All inputs on the same port share the same clock, clock enable, and reset selections. All outputs on the same port share the same clock, clock enable, and reset selections. Selections may be made independently between both inputs and outputs and ports. Table 5 shows the possible sources for the clock, clock enable and initialization signals for the various registers. Figure 9. Dual-Port SRAM Block Diagram Table 5. Register Clock, Clock Enable, and Reset in Dual-Port SRAM Mode Register Input Source Address, Write Data, Read Data, Read/ Write, and Chip Select Clock CLKA (CLKB) or one of the global clocks (CLK0 - CLK3). The selected sig- nal can be inverted if desired. Clock Enable CENA (CENB) or one of the global clocks (CLK1 - CLK 2). The selected sig- nal can be inverted if required. Reset Created by the logical OR of the global reset signal and RSTA (RSTB). RSTA (RSTB) can be inverted is desired. ‘ ‘ Read/Write Address (ADA[0:8-12]) Clock A (CLKA) Write/Read A (WRA) Reset A (RSTA) 68 Inputs From Routing Dual Port SRAM Array PORT A PORT B Similar signals as PORT A: ADB[0:8-12], RSTB, CLKB, CENB, WRB, CSB[0,1], DIB[0:0,1,3,7,15] Write Data (DIA[0:0,1,3,7,15]) Chip Sel A (CSA [0:1]) Clk En A (CENA) RESET CLK0 CLK3 CLK1 CLK2 RD Data A (DOA[0:0-15]) RD Data B (DOB[0:0-15]) |
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