參數(shù)資料
型號(hào)： SNJ54BCT8245AJT
廠商： TEXAS INSTRUMENTS INC
元件分類： 總線收發(fā)器
英文描述： BCT/FBT SERIES, 8-BIT BOUNDARY SCAN TRANSCEIVER, TRUE OUTPUT, CDIP24
封裝： CERAMIC, DIP-24
文件頁(yè)數(shù)： 30/30頁(yè)
文件大?。?/td> 630K
代理商： SNJ54BCT8245AJT
SN54BCT8245A, SN74BCT8245A
SCAN TEST DEVICES
WITH OCTAL BUS TRANSCEIVERS
SCBS043E MAY 1990 REVISED JULY 1996
9
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 772511443
data register description
boundary-scan register
The boundary-scan register (BSR) is 18 bits long. It contains one boundary-scan cell (BSC) for each
normal-function input pin and one BSC for each normal-function output pin. Which I/O ports, A or B, function
as input terminals and which function as output terminals is determined by the DIR signal (BSC17) as described
below. The BSR is used 1) to store test data that is to be applied internally to the inputs of the normal on-chip
logic and/or externally to the device output terminals, and/or 2) to capture data that appears internally at the
outputs of the normal on-chip logic and/or externally at the device input terminals.
The source of data to be captured into the BSR during Capture-DR is determined by the current instruction. The
contents of the BSR may change during Run-Test/Idle, as determined by the current instruction. The contents
of the BSR are not changed in Test-Logic-Reset.
The BSR order of scan is from TDI through bits 170 to TDO. Table 1 shows the BSR bits and their associated
device pin signals. The device signals I1I8 and O1O8 represent data input signals and data output signals,
respectively. The direction control signal (DIR) as output by BSC17 determines which port, A or B, is considered
an input and which is considered an output. When the output of BSC17 is logic 0, the device signals I1I8 are
associated with I/O ports B1B8, while device signals O1O8 are associated with I/O ports A1A8. When the
output of BSC17 is logic 1, the converse is true (that is, I1I8 are associated with A1A8, while O1O8 are
associated with B1B8). In normal-function mode, the output of the BSC17 input is equivalent to the input signal
present at the DIR input pin.
Table 1. Boundary-Scan Register Configuration
BSR BIT
NUMBER
DEVICE
SIGNAL
BSR BIT
NUMBER
DEVICE
SIGNAL
BSR BIT
NUMBER
DEVICE
SIGNAL
17
DIR
15
I1
7
O1
16
OE
14
I2
6
O2
13
I3
5
O3
12
I4
4
O4
11
I5
3
O5
10
I6
2
O6
9
I7
1
O7
8
I8
0
O8
boundary-control register
The boundary-control register (BCR) is two 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 and PSA. Table 3 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 10, which selects the PSA test operation. The BCR order of scan is shown in Figure 3.
TDO
TDI
Bit 0
(LSB)
Bit 1
(MSB)
Figure 3. Boundary-Control Register Order of Scan
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