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SN74BCT8244ANT Datasheet(PDF) 11 Page - Texas Instruments

Part # SN74BCT8244ANT
Description  SCAN TEST DEVICES WITH OCTAL BUFFERS
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
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SN74BCT8244ANT Datasheet(HTML) 11 Page - Texas Instruments

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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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