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SN74ACT8999 데이터시트(PDF) 8 Page - Texas Instruments

부품명 SN74ACT8999
상세설명  SCAN-PATH SELECTORS WITH 8-BIT BIDIRECTIONAL DATA BUSES SCAN-CONTROLLED IEEE STD 1149.1 (JTAG) TAP MULTIPLEXERS
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SN54ACT8999, SN74ACT8999
SCANPATH SELECTORS WITH 8BIT BIDIRECTIONAL DATA BUSES
SCANCONTROLLED IEEE STD 1149.1 (JTAG) TAP MULTIPLEXERS
SCAS158D − JUNE 1990 − REVISED DECEMBER 1996
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251−1443
Table 2. Instruction-Register Opcodes
BINARY CODE
BIT 7
→ BIT 0
MSB
→ LSB
HEX
VALUE
SCOPE OPCODE
DESCRIPTION
SELECTED DATA
REGISTER
MODE
00000000
00
EXTEST
Boundary scan
Boundary scan
Test
10000001
81
BYPASS
Bypass scan
Bypass
Normal
10000010
82
SAMPLE/PRELOAD
Sample boundary
Boundary scan
Normal
00000011
03
INTEST
Boundary scan
Boundary scan
Test
10000100
84
BYPASS†
Bypass scan
Bypass
Normal
00000101
05
BYPASS†
Bypass scan
Bypass
Normal
00000110
06
BYPASS†
Bypass scan
Bypass
Normal
10000111
87
BYPASS†
Bypass scan
Bypass
Normal
10001000
88
COUNT
Count
Bypass
Normal
00001001
09
COUNT
Count
Bypass
Normal
00001010
0A
BYPASS†
Bypass scan
Bypass
Normal
10001011
8B
BYPASS†
Bypass scan
Bypass
Normal
00001100
0C
BYPASS†
Bypass scan
Bypass
Normal
10001101
8D
BYPASS
Bypass scan
Bypass
Normal
10001110
8E
SCANCN
Control register scan
Control
Normal
00001111
0F
SCANCN
Control register scan
Control
Normal
11111010
FA
SCANCNT
Counter scan
Counter
Normal
01111011
7B
READCNT
Counter read
Counter
Normal
11111100
FC
SCANIDB
ID bus register scan
ID bus
Normal
01111101
7D
READIDB
ID bus register read
ID bus
Normal
01111110
7E
SCANSEL
Select register scan
Select
Normal
All others
BYPASS
Bypass scan
Bypass
Normal
† A SCOPE opcode exists but is not supported by the ’ACT8999.
Table 3. IRERR Function Table
NO. OF INSTRUCTION
REGISTER BITS = 1
IRERR
0, 2, 4, 6, 8
1
1, 3, 5, 7
0
Table 4. Instruction-Register Status Word
IR BIT
VALUE‡
7
IRERR (see Table 3)
6
0
5
0
4
0
3
Level present at DCI input (1 = H, 0 = L)
2
SRERR (see Table 8)
1
0
0
1
‡ This value is loaded in the instruction register during
the Capture-IR TAP state.


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