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RTAX250-SB624EV Datasheet(PDF) 100 Page - Actel Corporation |
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RTAX250-SB624EV Datasheet(HTML) 100 Page - Actel Corporation |
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100 / 170 page  RTAX-S/SL RadTolerant FPGAs 2- 82 v5.3 Other Architectural Features Charge Pump Bypass To reduce power consumption, the internal charge pump can be bypassed and an external power supply voltage can be used instead. This saves the internal charge-pump operating current, resulting in no DC current draw. The RTAX-S/SL family devices have a dedicated "VPUMP" pin that can be used to access an external charge pump device. In normal chip operation, when using the internal charge pump, VPUMP should be tied to GND. When the voltage level on VPUMP is set to 3.3 V, the internal charge pump is turned off, and the VPUMP voltage will be used as the charge pump voltage. Adequate voltage regulation (i.e., high drive, low output impedance, and good decoupling) should be used at VPUMP. JTAG RTAX-S/SL offers a JTAG interface that is compliant with the IEEE 1149.1 standard except for the device ID length which is 33 bits. The user can employ the JTAG interface for probing a design and executing any JTAG public instructions as defined in the Table 2-100. The JTAG pins and probes are configured as a LVTTL standard port. Refer to the IEEE Standard 1149.1 (JTAG) in the Axcelerator Family application note, which also applies to the RTAX-S/SL family of devices. The JTAG pins should not be left floating on flight systems. Interface The interface consists of four inputs: Test Mode Select (TMS), Test Data In (TDI), Test Clock (TCK), TAP Controller Reset (TRST), and an output, Test Data Out (TDO). TMS, TDI, and TRST have on-chip pull-up resistors. TRST TRST (Test-Logic Reset) is an active-low asynchronous reset signal to the TAP controller. The TRST input can be used to reset the Test Access Port (TAP) Controller to the TRST state. The TAP Controller can be held at this state permanently by grounding the TRST pin. To hold the JTAG TAP controller in the TRST state, it is recommended to connect TRST directly to ground for flight. There is an optional internal pull-up resistor available for the TRST input that can be set by the user at programming. Care should be exercised when using this option in combination with an external tie-off to ground. An on-chip power-on-reset (POWRST) circuit is included. POWRST has the same function as "TRST," but it only occurs at power-up or during recovery from a VCCA and/ or VCCDA voltage drop. TDO TDO is normally tristated, and it is active only when the TAP controller is in the "Shift_DR" state or "Shift_IR" state. The least significant bit of the selected register (i.e., IR or DR) is clocked out to TDO first by the falling edge of TCK. TAP Controller The TAP Controller is compliant with the IEEE Standard 1149.1. It is a state machine of 16 states that controls the Instruction Register (IR) and the Data Registers (such as Boundary-Scan Register, IDCODE, USRCODE, BYPASS, etc.). The TAP Controller steps into one of the states depending on the sequence of TMS at the rising edges of TCK. Instruction Register (IR) The IR has five bits (IR4 to IR0). At the TRST state, IR is reset to IDCODE. Each time when IR is selected, it goes through "select IR-Scan," "Capture-IR," "Shift-IR," all the way through "Update-IR." When there is no test error, the first five data bits coming out of TDO during the "Shift-IR" will be "10111." If a test error occurs, the last three bits will contain one to three zeroes corresponding to negatively asserted signals: "TDO_ERRORB," "PROBA_ERRORB," and "PROBB_ERRORB." The error(s) will be erased when the TAP is at the "Update-IR" or the TRST state. When in user mode start-up sequence, if the micro-probe has not been used, the "PROBA_ERRORB" is used as a "Power-up done successfully" flag. During flight, the following configurations for all JTAG and Probe pins are recommended (Table 2-101 on page 2-83). Table 2-100 • JTAG Instruction Code Instruction (IR4:IR0) Binary Code EXTEST 00000 PRELOAD / SAMPLE 00001 INTEST 00010 USERCODE 00011 IDCODE 00100 HIGHZ 01110 CLAMP 01111 DIAGNOSTIC 10000 Reserved All others BYPASS 11111 |
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