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SN74ABT18502 Folha de dados(PDF) 10 Page - Texas Instruments

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Nome de Peças SN74ABT18502
Descrição Electrónicos  SCAN TEST DEVICE WITH 18-BIT REGISTERED BUS TRANSCEIVER
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Fabricante Electrônico  TI1 [Texas Instruments]
Página de início  http://www.ti.com
Logo TI1 - Texas Instruments

SN74ABT18502 Folha de dados(HTML) 10 Page - Texas Instruments

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SN54ABT18502
SCAN TEST DEVICE WITH
18-BIT REGISTERED BUS TRANSCEIVER
SCBS109C – AUGUST 1992 – REVISED AUGUST 1994
4–10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
boundary-control register
The boundary-control register (BCR) is 21 bits long. The BCR is used in the context of the RUNT instruction to
implement additional test operations not included in the basic SCOPE
™ instruction set. Such operations include
PRPG, PSA with input masking, and binary count up (COUNT). Table 5 shows the test operations that are
decoded by the BCR.
During Capture-DR, the contents of the BCR are not changed. At power up or in Test-Logic-Reset, the BCR is
reset to the binary value 000000000000000000010, which selects the PSA test operation with no input masking.
The BCR order of scan is from TDI through bits 20 – 0 to TDO. Table 2 shows the BCR bits and their associated
test control signals.
Table 2. Boundary-Control-Register Configuration
BCR BIT
NUMBER
TEST
CONTROL
SIGNAL
BCR BIT
NUMBER
TEST
CONTROL
SIGNAL
BCR BIT
NUMBER
TEST
CONTROL
SIGNAL
20
MASK2.9
11
MASK1.9
2
OPCODE2
19
MASK2.8
10
MASK1.8
1
OPCODE1
18
MASK2.7
9
MASK1.7
0
OPCODE0
17
MASK2.6
8
MASK1.6
––
––
16
MASK2.5
7
MASK1.5
––
––
15
MASK2.4
6
MASK1.4
––
––
14
MASK2.3
5
MASK1.3
––
––
13
MASK2.2
4
MASK1.2
––
––
12
MASK2.1
3
MASK1.1
––
––
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 3.
Bit 0
TDO
TDI
Figure 3. Bypass Register Order of Scan


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