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SN74BCT8373DW 데이터시트(PDF) 5 Page - Texas Instruments

부품명 SN74BCT8373DW
상세설명  SCAN TEST DEVICE WITH OCTAL D-TYPE LATCHES
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SN74BCT8373
SCAN TEST DEVICE
WITH OCTAL DTYPE LATCHES
SCBS471 − JUNE 1990 − REVISED JUNE 1994
2−5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251−1443
test architecture
Serial-test information is conveyed by means of a 4-wire test bus, or TAP, that conforms to IEEE Standard
1149.1-1990. Test instructions, test data, and test control signals all are passed along this serial-test bus. The
TAP controller monitors two signals from the test bus, namely TCK and TMS. The TAP controller extracts the
synchronization (TCK) and state control (TMS) signals from the test bus and generates the appropriate on-chip
control signals for the test structures in the device. Figure 1 shows the TAP-controller state diagram.
The TAP controller is fully synchronous to the TCK signal. Input data is captured on the rising edge of TCK, and
output data changes on the falling edge of TCK. This scheme ensures that data to be captured is valid for fully
one-half of the TCK cycle.
The functional block diagram illustrates the IEEE Standard 1149.1-1990 4-wire test bus and boundary-scan
architecture and the relationship among the test bus, the TAP controller, and the test registers. As illustrated,
the device contains an 8-bit instruction register and three test-data registers: an 18-bit boundary-scan register,
a 2-bit boundary-control register, and a 1-bit bypass register.
Test-Logic-Reset
Run-Test/Idle
Select-DR-Scan
Capture-DR
Shift-DR
Exit1-DR
Pause-DR
Update-DR
TMS = L
TMS = L
TMS = H
TMS = L
TMS = H
TMS = H
TMS = L
TMS = H
TMS = L
TMS = L
TMS = H
TMS = L
Exit2-DR
Select-IR-Scan
Capture-IR
Shift-IR
Exit1-IR
Pause-IR
Update-IR
TMS = L
TMS = L
TMS = H
TMS = L
TMS = H
TMS = H
TMS = L
TMS = H
TMS = L
Exit2-IR
TMS = L
TMS = H
TMS = H
TMS = H
TMS = L
TMS = H
TMS = L
TMS = H
TMS = H
TMS = H
TMS = L
Figure 1. TAP-Controller State Diagram


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