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SN74BCT8244ADWE4 Datasheet(PDF) 11 Page - Texas Instruments |
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SN74BCT8244ADWE4 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 28 page SN54BCT8244A, SN74BCT8244A SCAN TEST DEVICES WITH OCTAL BUFFERS SCBS042E – FEBRUARY 1990 – REVISED JULY 1996 11 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 control boundary to high impedance This instruction conforms to the IEEE Standard 1149.1a-1993 HIGHZ instruction. The bypass register is selected in the scan path. A logic 0 value is captured in the bypass register during Capture-DR. The device operates in a modified test mode in which all device output terminals are placed in the high-impedance state, the device input terminals remain operational, and the normal on-chip logic function is performed. control boundary to 1/0 This instruction conforms to the IEEE Standard 1149.1a-1993 CLAMP instruction. The bypass register is selected in the scan path. A logic 0 value is captured in the bypass register during Capture-DR. Data in the input BSCs is applied to the inputs of the normal on-chip logic, while data in the output BSCs is applied to the device output terminals. The device operates in the test mode. boundary run test The bypass register is selected in the scan path. A logic 0 value is captured in the bypass register during Capture-DR. The device operates in the test mode. The test operation specified in the BCR is executed during Run-Test/Idle. The four test operations decoded by the BCR are: sample inputs/toggle outputs (TOPSIP), PRPG, PSA, and simultaneous PSA and PRPG (PSA/PRPG). boundary read The BSR is selected in the scan path. The value in the BSR remains unchanged during Capture-DR. This instruction is useful for inspecting data after a PSA operation. boundary self test The BSR is selected in the scan path. All BSCs capture the inverse of their current values during Capture-DR. In this way, the contents of the shadow latches may be read out to verify the integrity of both shift-register and shadow-latch elements of the BSR. The device operates in the normal mode. boundary toggle outputs The bypass register is selected in the scan path. A logic 0 value is captured in the bypass register during Capture-DR. Data in the shift register elements of the selected output BSCs is toggled on each rising edge of TCK in Run-Test/Idle and is then updated in the shadow latches and applied to the associated device output terminals on each falling edge of TCK in Run-Test/Idle. Data in the selected input BSCs remains constant and is applied to the inputs of the normal on-chip logic. Data appearing at the device input terminals is not captured in the input BSCs. The device operates in the test mode. boundary-control-register scan The BCR is selected in the scan path. The value in the BCR remains unchanged during Capture-DR. This operation must be performed before a boundary-run test operation to specify which test operation is to be executed. |
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