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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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DS2155 датащи(PDF) 30 Page - Dallas Semiconductor |
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DS2155 датащи(HTML) 30 Page - Dallas Semiconductor |
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30 / 262 page  DS2156 30 of 262 3.6 JTAG Test Access Port Pins Signal Name: JTRST Signal Description: IEEE 1149.1 Test Reset Signal Type: Input JTRST is used to asynchronously reset the test access port controller. After power-up, JTRST must be toggled from low to high. This action sets the device into the JTAG DEVICE ID mode. Normal device operation is restored by pulling JTRST low. JTRST is pulled high internally by a 10kΩ resistor operation. Signal Name: JTMS Signal Description: IEEE 1149.1 Test Mode Select Signal Type: Input This pin is sampled on the rising edge of JTCLK and is used to place the test access port into the various defined IEEE 1149.1 states. This pin has a 10kΩ pullup resistor. Signal Name: JTCLK Signal Description: IEEE 1149.1 Test Clock Signal Signal Type: Input This signal is used to shift data into JTDI on the rising edge and out of JTDO on the falling edge. Signal Name: JTDI Signal Description: IEEE 1149.1 Test Data Input Signal Type: Input Test instructions and data are clocked into this pin on the rising edge of JTCLK. This pin has a 10kΩ pullup resistor. Signal Name: JTDO Signal Description: IEEE 1149.1 Test Data Output Signal Type: Output Test instructions and data are clocked out of this pin on the falling edge of JTCLK. If not used, this pin should be left unconnected. |
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