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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

BSDL Extensions for dot6

Michael Sberro

JTAG course 2005


Agenda
Agenda

  • Short Review

  • Some BSR cells for dot6

  • Dot6 example device


Short review
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)


Ac dc selection cells
AC/DC Selection Cells

The AC_SelX cell captures the state of its “shift_In” line in the rising edge of the TCK


Ac 1 output data cell
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.)



Ac 10 self monitoring output data cell
AC_10 Self Monitoring Output Data Cell

  • Monitors the state of its output driver

  • Corresponds to BC_10



Dot6 example device
Dot6 Example Device constant 1

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.


Diff., support Extests constant 1

AC coupled integrated on chip

Ordinary DC

Diff., hence can be AC/DC

G and H form a differential bidirectional pin pair

Ordinary DC


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


Thanks
Thanks… standards:


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