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P1AFS1500-PQ484I Datasheet(PDF) 81 Page - Microsemi Corporation |
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P1AFS1500-PQ484I Datasheet(HTML) 81 Page - Microsemi Corporation |
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81 / 334 page  Fusion Family of Mixed Signal FPGAs Revision 4 2-65 Modes of Operation There are two read modes and one write mode: • Read Nonpipelined (synchronous—1 clock edge): In the standard read mode, new data is driven onto the RD bus in the same clock cycle following RA and REN valid. The read address is registered on the read port clock active edge, and data appears at RD after the RAM access time. Setting PIPE to OFF enables this mode. • Read Pipelined (synchronous—2 clock edges): The pipelined mode incurs an additional clock delay from the address to the data but enables operation at a much higher frequency. The read address is registered on the read port active clock edge, and the read data is registered and appears at RD after the second read clock edge. Setting PIPE to ON enables this mode. • Write (synchronous—1 clock edge): On the write clock active edge, the write data is written into the SRAM at the write address when WEN is High. The setup times of the write address, write enables, and write data are minimal with respect to the write clock. Write and read transfers are described with timing requirements in the "SRAM Characteristics" section on page 2-66 and the "FIFO Characteristics" section on page 2-75. RAM Initialization Each SRAM block can be individually initialized on power-up by means of the JTAG port using the UJTAG mechanism (refer to the "JTAG IEEE 1532" section on page 2-232 and the Fusion SRAM/FIFO Blocks application note). The shift register for a target block can be selected and loaded with the proper bit configuration to enable serial loading. The 4,608 bits of data can be loaded in a single operation. |
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