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SN74BCT8373DW Datenblatt(PDF) 10 Page - Texas Instruments

Teilenummer SN74BCT8373DW
Bauteilbeschribung  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
2−10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251−1443
bypass register
The bypass register is a 1-bit scan path that can be selected to shorten the length of the system scan path,
thereby reducing the number of bits per test pattern that must be applied to complete a test operation.
During Capture-DR, the bypass register captures a logic 0. The bypass register order of scan is illustrated in
Figure 4.
Bit 0
TDO
TDI
Figure 4. Bypass Register Order of Scan
instruction-register opcode description
The instruction-register opcodes are shown in Table 2. The following descriptions detail the operation of each
instruction.
Table 2. Instruction Register Opcodes
BINARY CODE†
BIT 7
→ BIT 0
MSB
→ LSB
SCOPE OPCODE
DESCRIPTION
SELECTED DATA
REGISTER
MODE
X0000000
EXTEST
Boundary scan
Boundary scan
Test
X0000001
BYPASS‡
Bypass scan
Bypass
Normal
X0000010
SAMPLE/PRELOAD
Sample boundary
Boundary scan
Normal
X0000011
INTEST
Boundary scan
Boundary scan
Test
X0000100
BYPASS‡
Bypass scan
Bypass
Normal
X0000101
BYPASS‡
Bypass scan
Bypass
Normal
X0000110
HIGHZ (TRIBYP)
Control boundary to high impedance
Bypass
Modified test
X0000111
CLAMP (SETBYP)
Control boundary to 1/0
Bypass
Test
X0001000
BYPASS‡
Bypass scan
Bypass
Normal
X0001001
RUNT
Boundary run test
Bypass
Test
X0001010
READBN
Boundary read
Boundary scan
Normal
X0001011
READBT
Boundary read
Boundary scan
Test
X0001100
CELLTST
Boundary self test
Boundary scan
Normal
X0001101
TOPHIP
Boundary toggle outputs
Bypass
Test
X0001110
SCANCN
Boundary-control register scan
Boundary control
Normal
X0001111
SCANCT
Boundary-control register scan
Boundary control
Test
All others
BYPASS
Bypass scan
Bypass
Normal
† Bit 7 is a don’t-care bit; X = don’t care.
‡ The BYPASS instruction is executed in lieu of a SCOPE instruction that is not supported in the SN74BCT8373.


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