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AX1000-CG896PP Datasheet(PDF) 10 Page - Actel Corporation |
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AX1000-CG896PP Datasheet(HTML) 10 Page - Actel Corporation |
10 / 226 page Axcelerator Family FPGAs 1- 4 v2.7 Embedded Memory As mentioned earlier, each core tile has either three (in a smaller tile) or four (in the regular tile) embedded SRAM blocks along the west side, and each variable-aspect- ratio SRAM block is 4,608 bits in size. Available memory configurations are: 128x36, 256x18, 512x9, 1kx4, 2kx2 or 4kx1 bits. The individual blocks have separate read and write ports that can be configured with different bit widths on each port. For example, data can be written in by eight and read out by one. In addition, every SRAM block has an embedded FIFO control unit. The control unit allows the SRAM block to be configured as a synchronous FIFO without using core logic modules. The FIFO width and depth are programmable. The FIFO also features programmable ALMOST-EMPTY (AEMPTY) and ALMOST-FULL (AFULL) flags in addition to the normal EMPTY and FULL flags. In addition to the flag logic, the embedded FIFO control unit also contains the counters necessary for the generation of the read and write address pointers as well as control circuitry to prevent metastability and erroneous operation. The embedded SRAM/FIFO blocks can be cascaded to create larger configurations. I/O Logic The Axcelerator family of FPGAs features a flexible I/O structure, supporting a range of mixed voltages with its bank-selectable I/Os: 1.5V, 1.8V, 2.5V, and 3.3V. In all, Axcelerator FPGAs support at least 14 different I/O standards (single-ended, differential, voltage-referenced). The I/Os are organized into banks, with eight banks per device (two per side). The configuration of these banks determines the I/O standards supported (see "User I/Os" on page 2-10 for more information). All I/O standards are available in each bank. Each I/O module has an input register (InReg), an output register (OutReg), and an enable register (EnReg) (Figure 1-7 on page 1-5). An I/O Cluster includes two I/O modules, four RX modules, two TX modules, and a buffer (B) module. Figure 1-6 • AX Device Architecture (AX1000 shown) Chip Layout SuperCluster I/O Structure See Figure 7 RAMC RAMC RAMC RAMC RAMC RAMC RAMC RAMC RAMC RAMC RAMC RAMC RAMC RAMC RAMC RAMC RAMC RAMC RAMC RAMC RAMC RAMC RAMC RAMC RAMC RAMC RAMC RAMC HD SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC HD SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC HD SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC HD SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC HD SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC HD SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC HD SC SC SC SC RD RD RD RD RD RD RD RD RD RD RD RD RD RD RD RD RD RD RD RD RD RD RD RD RD RD RD RD SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC HD SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC HD SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC HD SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC HD SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC HD SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC SC HD SC SC SC SC Core Tile 4k RAM/ FIFO 4k RAM/ FIFO 4k RAM/ FIFO 4k RAM/ FIFO RX TX B C R C C C R RX RX RX TX TX TX |
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