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A42MX09 Datasheet(PDF) 11 Page - Microsemi Corporation |
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A42MX09 Datasheet(HTML) 11 Page - Microsemi Corporation |
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11 / 143 page  40MX and 42MX FPGA Families 1-7 Revision 12 MultiPlex I/O Modules 42MX devices feature Multiplex I/Os and support 5.0V, 3.3V, and mixed 3.3V/5.0V operations. The MultiPlex I/O modules provide the interface between the device pins and the logic array. Figure 1-9 is a block diagram of the 42MX I/O module. A variety of user functions, determined by a library macro selection, can be implemented in the module. (Refer to the Antifuse Macro Library Guide for more information.) All 42MX I/O modules contain tristate buffers, with input and output latches that can be configured for input, output, or bidirectional operation. All 42MX devices contain flexible I/O structures, where each output pin has a dedicated output-enable control (Figure 1-9). The I/O module can be used to latch input or output data, or both, providing fast set-up time. In addition, the Designer software tools can build a D-type flip-flop using a C-module combined with an I/O module to register input and output signals. Refer to the Antifuse Macro Library Guide for more details. A42MX24 and A42MX36 devices also offer selectable PCI output drives, enabling 100% compliance with version 2.1 of the PCI specification. For low-power systems, all inputs and outputs are turned off to reduce current consumption to below 500 A. To achieve 5.0V or 3.3V PCI-compliant output drives on A42MX24 and A42MX36 devices, a chip-wide PCI fuse is programmed via the Device Selection Wizard in the Designer software (Figure 1-10). When the PCI fuse is not programmed, the output drive is standard. Designer software development tools provide a design library of I/O macro functions that can implement all I/O configurations supported by the MX FPGAs. Note: *Can be configured as a Latch or D Flip-Flop (Using C-Module) Figure 1-9 • 42MX I/O Module Figure 1-10 • PCI Output Structure of A42MX24 and A42MX36 Devices Q D From Array To Array G/CLK* G/CLK* Q D PAD EN Signal PCI Enable PCI Fuse Drive STD Output |
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