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PCI2050 bảng dữ liệu(PDF) 34 Page - Texas Instruments

tên linh kiện PCI2050
Giải thích chi tiết về linh kiện  PCI-TO-PCI BRIDGE
PDF  81 Pages
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nhà sản xuất  TI [Texas Instruments]
Trang chủ  http://www.ti.com
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PCI2050 bảng dữ liệu(HTML) 34 Page - Texas Instruments

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3–10
3.15 JTAG Support
The PCI2050 implements a JTAG test port based on the IEEE Standard 1149.1,
IEEE Standard Test Access Port and
Boundary-Scan Architecture. The JTAG test port consists of the following:
•
A 5-wire test access port
•
A test access port controller
•
An instruction register
•
A bypass register
•
A boundary-scan register
3.15.1 Test Port Instructions
The PCI 2050 supports the following JTAG instructions:
•
EXTEST, BYPASS, and SAMPLE
•
HIGHZ and CLAMP
•
Private (various private instructions used by TI for test purposes)
Table 3–4. JTAG Instructions and Op Codes
INSTRUCTION
OP CODE
DESCRIPTION
EXTEST
00000
External test: drives terminals from the boundary scan register
SAMPLE
00001
Sample I/O terminals
CLAMP
00100
Drives terminals from the boundary scan register and selects the bypass register for shifts
HIGHZ
00101
Puts all outputs and I/O terminals except for the TDO terminal in a high–impedance state
BYPASS
11111
Selects the bypass register for shifts
Table 3–5. Boundary Scan Terminal Order
BOUNDARY SCAN
REGISTER NO.
PDV TERMINAL
NUMBER
GHK TERMINAL
NUMBER
TERMINAL NAME
GROUP DISABLE
REGISTER
BOUNDARY-SCAN
CELL TYPE
0
137
J15
S_AD0
19
Bidirectional
1
138
H19
S_AD1
19
Bidirectional
2
140
H17
S_AD2
19
Bidirectional
3
141
H14
S_AD3
19
Bidirectional
4
143
G19
S_AD4
19
Bidirectional
5
144
G18
S_AD5
19
Bidirectional
6
146
G14
S_AD6
19
Bidirectional
7
147
F19
S_AD7
19
Bidirectional
8
149
G15
S_C/BE0
19
Bidirectional
9
150
F17
S_AD8
19
Bidirectional
10
152
F14
S_AD9
19
Bidirectional
11
153
E18
S_M66ENA
19
Bidirectional
12
154
F15
S_AD10
19
Bidirectional
13
155
E17
MS0
–
Input
14
158
C15
S_AD11
19
Bidirectional
15
161
B15
S_AD12
19
Bidirectional
16
162
A15
S_AD13
19
Bidirectional
17
164
B14
S_AD14
19
Bidirectional
18
165
E13
S_AD15
19
Bidirectional
19
–
–
–
–
Control



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