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BSDL Extensions for dot6

BSDL Extensions for dot6. Michael Sberro JTAG course 2005. Agenda. Short Review Some BSR cells for dot6 Dot6 example device. Short Review. AC and DC tests are very common in dot6 since it does not separate digital & analog signals

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BSDL Extensions for dot6

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  1. BSDL Extensions for dot6 Michael Sberro JTAG course 2005

  2. Agenda • Short Review • Some BSR cells for dot6 • Dot6 example device

  3. Short Review • AC and DC tests are very common in dot6 since it does not separate digital & analog signals • Dot6 enables BS testing between DC-coupled pins and AC-coupled pins according to test modes • In addition to the DC-extest of dot1, dot6 has AC extests (extest_train, extest_pulse)

  4. AC/DC Selection Cells The AC_SelX cell captures the state of its “shift_In” line in the rising edge of the TCK

  5. AC_1 Output Data Cell • Dot1: BC cells test pins connectivity • The corresponding in dot6 are AC cells. Additional logic is added: Mux, controlled by AC_mode pin to select between DC or AC extests; XOR gate (captured sig., AC test sig.)

  6. Mode 5 is 1 for extests

  7. AC_10 Self Monitoring Output Data Cell • Monitors the state of its output driver • Corresponds to BC_10

  8. First time mode 5 is 0, for initial input, then it becomes constant 1

  9. Dot6 Example Device The designer marks pins as DC or AC to benefit from the dot6 extra test resources. The drivers and receivers are determined by these I/O pins.

  10. Diff., support Extests AC coupled integrated on chip Ordinary DC Diff., hence can be AC/DC G and H form a differential bidirectional pin pair Ordinary DC

  11. …Now the device is added all the functionality of both standards:Dot1’s: TAP, BSR Dot6’s: AC cells, TRs (self ref.):

  12. Thanks…

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