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AFS090-1QN256ES Datasheet(PDF) 9 Page - Actel Corporation |
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AFS090-1QN256ES Datasheet(HTML) 9 Page - Actel Corporation |
9 / 318 page Actel Fusion Mixed-Signal FPGAs Pr el iminar y v1 .7 1-5 With Fusion, Actel also introduces the Analog Quad I/O structure (Figure 1-1 on page 1-5). Each quad consists of three analog inputs and one gate driver. Each quad can be configured in various built-in circuit combinations, such as three prescaler circuits, three digital input circuits, a current monitor circuit, or a temperature monitor circuit. Each prescaler has multiple scaling factors programmed by FPGA signals to support a large range of analog inputs with positive or negative polarity. When the current monitor circuit is selected, two adjacent analog inputs measure the voltage drop across a small external sense resistor. Built-in operational amplifiers amplify small voltage signals (2 mV sensitivity) for accurate current measurement. One analog input in each quad can be connected to an external temperature monitor diode and achieves detection accuracy of ±3ºC. In addition to the external temperature monitor diode(s), a Fusion device can monitor an internal temperature diode using dedicated channel 31 of the ADCMUX. Figure 1-1 on page 1-5 illustrates a typical use of the Analog Quad I/O structure. The Analog Quad shown is configured to monitor and control an external power supply. The AV pad measures the source of the power supply. The AC pad measures the voltage drop across an external sense resistor to calculate current. The AG MOSFET gate driver pad turns the external MOSFET on and off. The AT pad measures the load-side voltage level. Embedded Memories Flash Memory Blocks The flash memory available in each Fusion device is composed of one to four flash blocks, each 2 Mbits in density. Each block operates independently with a dedicated flash controller and interface. Fusion flash memory blocks combine fast access times (60 ns random access and 10 ns access in Read-Ahead mode) with a configurable 8-, 16-, or 32-bit datapath, enabling high-speed Figure 1-1 • Analog Quad Analog Quad AV AC AT Voltage Monitor Block Current Monitor Block AG Power Line Side Load Side Pre- scaler Digital Input Power MOSFET Gate Driver Current Monitor/Instr Amplifier Temperature Monitor Digital Input Digital Input Pre- scaler Pre- scaler Pads To Analog MUX To Analog MUX To Analog MUX To FPGA (DAVOUTx) To FPGA (DACOUTx) To FPGA (DATOUTx) On-Chip Gate Driver Temperature Monitor Block Off-Chip Rpullup From FPGA (GDONx) |
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