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EP1C12F100I7 Datasheet(PDF) 25 Page - Altera Corporation |
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EP1C12F100I7 Datasheet(HTML) 25 Page - Altera Corporation |
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25 / 94 page  Altera Corporation 25 Preliminary Information Cyclone FPGA Family Data Sheet When configured as RAM or ROM, the designer can use an initialization file to pre-load the memory contents. Two single-port memory blocks can be implemented in a single M4K block as long as each of the two independent block sizes is equal to or less than half of the M4K block size. The Quartus II software automatically implements larger memory by combining multiple M4K memory blocks. For example, two 256 × 16-bit RAM blocks can be combined to form a 256 × 32-bit RAM block. Memory performance does not degrade for memory blocks using the maximum number of words allowed. Logical memory blocks using less than the maximum number of words use physical blocks in parallel, eliminating any external control logic that would increase delays. To create a larger high-speed memory block, the Quartus II software automatically combines memory blocks with LE control logic. Parity Bit Support The M4K blocks support a parity bit for each byte. The parity bit, along with internal LE logic, can implement parity checking for error detection to ensure data integrity. Designers can also use parity-size data words to store user-specified control bits. Byte enables are also available for data input masking during write operations. Shift Register Support The designer can configure M4K memory blocks to implement shift registers for DSP applications such as pseudo-random number generators, multi-channel filtering, auto-correlation, and cross-correlation functions. These and other DSP applications require local data storage, traditionally implemented with standard flip-flops, which can quickly consume many logic cells and routing resources for large shift registers. A more efficient alternative is to use embedded memory as a shift register block, which saves logic cell and routing resources and provides a more efficient implementation with the dedicated circuitry. The size of a w × m × n shift register is determined by the input data width (w), the length of the taps (m), and the number of taps (n). The size of a w × m × n shift register must be less than or equal to the maximum number of memory bits in the M4K block (4,608 bits). The total number of shift register outputs (number of taps n × width w) must be less than the maximum data width of the M4K RAM block ( ×36). To create larger shift registers, multiple memory blocks are cascaded together. |
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