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A3P250-FGG144T Datasheet(PDF) 10 Page - Actel Corporation |
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A3P250-FGG144T Datasheet(HTML) 10 Page - Actel Corporation |
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10 / 136 page  Automotive ProASIC3 Device Family Overview 1- 6 v1.0 SRAM Automotive ProASIC3 devices have embedded SRAM blocks along their north and south sides. Each variable-aspect-ratio SRAM block is 4,608 bits in size. Available memory configurations are 256×18, 512×9, 1k×4, 2k×2, and 4k×1 bits. The individual blocks have independent read and write ports that can be configured with different bit widths on each port. For example, data can be sent through a 4-bit port and read as a single bitstream. The embedded SRAM blocks can be initialized via the device JTAG port (ROM emulation mode) using the UJTAG macro. PLL and CCC Automotive ProASIC3 devices provide designers with very flexible clock conditioning circuit (CCC) capabilities. Each member of the Automotive ProASIC3 family contains six CCCs. One CCC (center west side) has a PLL. The six CCC blocks are located at the four corners and the centers of the east and west sides. One CCC (center west side) has a PLL. All six CCC blocks are usable; the four corner CCCs and the east CCC allow simple clock delay operations as well as clock spine access. The inputs of the six CCC blocks are accessible from the FPGA core or from one of several inputs located near the CCC that have dedicated connections to the CCC block. The CCC block has these key features: • Wide input frequency range (fIN_CCC) = 1.5 MHz to 350 MHz • Output frequency range (fOUT_CCC) = 0.75 MHz to 350 MHz • Clock delay adjustment via programmable and fixed delays from –7.56 ns to +11.12 ns • 2 programmable delay types for clock skew minimization • Clock frequency synthesis (for PLL only) Additional CCC specifications: • Internal phase shift = 0°, 90°, 180°, and 270°. Output phase shift depends on the output divider configuration (for PLL only). • Output duty cycle = 50% ± 1.5% or better (for PLL only) • Low output jitter: worst case < 2.5% × clock period peak-to-peak period jitter when single global network used (for PLL only) • Maximum acquisition time is 300 µs (for PLL only) • Low power consumption of 5 mW • Exceptional tolerance to input period jitter— allowable input jitter is up to 1.5 ns (for PLL only) • Four precise phases; maximum misalignment between adjacent phases of 40 ps × 350 MHz / fOUT_CCC (for PLL only) Global Clocking Automotive ProASIC3 devices have extensive support for multiple clocking domains. In addition to the CCC and PLL support described above, there is a comprehensive global clock distribution network. Each VersaTile input and output port has access to nine VersaNets: six chip (main) and three quadrant global networks. The VersaNets can be driven by the CCC or directly accessed from the core via multiplexers (MUXes). The VersaNets can be used to distribute low-skew clock signals or for rapid distribution of high-fanout nets. I/Os with Advanced I/O Standards The Automotive ProASIC3 family of FPGAs features a flexible I/O structure, supporting a range of voltages (1.5 V, 1.8 V, 2.5 V, and 3.3 V). Automotive ProASIC3 FPGAs support many different I/O standards—single-ended and differential. The I/Os are organized into banks, with two or four banks per device. The configuration of these banks determines the I/O standards supported. |
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