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A40MX02-PQ208A Datasheet(PDF) 10 Page - Actel Corporation |
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A40MX02-PQ208A Datasheet(HTML) 10 Page - Actel Corporation |
10 / 78 page 40MX and 42MX Automotive FPGA Families 1- 6 v3.1 Power Supply Automotive MX devices are designed to operate in 5.0V environments. Table 1-1 describes the voltage settings of automotive MX devices. Power-Up/Down When powering up MX devices, VCCA must be greater than or equal to VCCI throughout the power-up sequence. If VCCI exceeds VCCA during power-up, either the input protection junction on the I/Os will be forward- biased or the I/Os will be at logical High, and ICC rises to high levels. During power-down, VCCA must be smaller than or equal to VCCI. Test Circuitry and Silicon Explorer II Probe MX devices contain probing circuitry that provides built- in access to every node in a design, via the use of Silicon Explorer II. Silicon Explorer II is an integrated hardware and software solution that, in conjunction with the Designer software, allow users to examine any of the internal nodes of the device while it is operating in a prototyping or a production system. The user can probe an MX device without changing the placement and routing of the design and without using any additional resources. Silicon Explorer II's noninvasive method does not alter timing or loading effects, thus shortening the debug cycle and providing a true representation of the device under actual functional situations. Silicon Explorer II samples data at 100 MHz (asynchronous) or 66 MHz (synchronous). Silicon Explorer II attaches to a PC's standard serial port, turning the PC into a fully functional 18-channel logic analyzer. Silicon Explorer II allows designers to complete the design verification process at their desks and reduces verification time from several hours per cycle to a few seconds. Silicon Explorer II is used to control the MODE, DCLK, SDI and SDO pins in MX devices to select the desired nets for debugging. The user simply assigns the selected internal nets in the Silicon Explorer II software to the PRA/PRB output pins for observation. Probing functionality is activated when the MODE pin is held HIGH. Figure 1-11 on page 1-7 illustrates the interconnection between Silicon Explorer II and 40MX devices, while Figure 1-12 on page 1-7 illustrates the interconnection between Silicon Explorer II and 42MX devices To allow for probing capabilities, the security fuses must not be programmed. (Refer to "User Security" section on page 1-5 for the security fuses of 40MX and 42MX devices). Table 1-2 on page 1-7 summarizes the possible device configurations for probing. PRA and PRB pins are dual-purpose pins. When the "Reserve Probe Pin" is checked in the Designer software, PRA and PRB pins are reserved as dedicated outputs for probing. If PRA and PRB pins are required as user I/Os to achieve successful layout and "Reserve Probe Pin" is checked, the layout tool will override the option and place user I/Os on PRA and PRB pins. Table 1-1 • Voltage Support of Automotive-Grade MX Devices Device VCC VCCA VCCI Maximum Input Tolerance Nominal Output Voltage 40MX 5.0V – – 5.25V 5.0V 42MX – 5.0V 5.0V 5.25V 5.0V |
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