參數(shù)資料
型號： SN54ABTH1826520A
廠商： Texas Instruments, Inc.
英文描述： Scan Test Devices With 18 Bit Universal Bus Transceivers and Registers( 掃描檢測裝置，帶18位總線收發(fā)器和寄存器)
中文描述： 掃描測試設(shè)備與18位通用總線收發(fā)器和寄存器（掃描檢測裝置，帶18位總線收發(fā)器和寄存器）
文件頁數(shù)： 14/36頁
文件大小： 848K
代理商： SN54ABTH1826520A
SN54ABTH18652A, SN54ABTH182652A, SN74ABTH18652A, SN74ABTH182652A
SCAN TEST DEVICES WITH
18-BIT BUS TRANSCEIVERS AND REGISTERS
SCBS167D – AUGUST 1993 – REVISED JULY 1996
14
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
instruction-register opcode description
The instruction-register opcodes are shown in Table 3. The following descriptions detail the operation of each
instruction.
Table 3. Instruction-Register Opcodes
BINARY CODE
BIT 7
→
BIT 0
MSB
→
LSB
00000000
SCOPE OPCODE
DESCRIPTION
SELECTED DATA
REGISTER
MODE
EXTEST
Boundary scan
Boundary scan
Test
10000001
IDCODE
Identification read
Device identification
Normal
10000010
SAMPLE/PRELOAD
BYPASS
BYPASS
BYPASS
Sample boundary
Boundary scan
Normal
00000011
Bypass scan
Bypass
Normal
10000100
Bypass scan
Bypass
Normal
00000101
Bypass scan
Bypass
Normal
00000110
HIGHZ
Control boundary to high impedance
Bypass
Modified test
10000111
CLAMP
BYPASS
Control boundary to 1/0
Bypass
Test
10001000
Bypass scan
Bypass
Normal
00001001
RUNT
Boundary-run test
Bypass
Test
00001010
READBN
Boundary read
Boundary scan
Normal
10001011
READBT
Boundary read
Boundary scan
Test
00001100
CELLTST
Boundary self test
Boundary scan
Normal
10001101
TOPHIP
Boundary toggle outputs
Bypass
Test
10001110
SCANCN
Boundary-control register scan
Boundary control
Normal
00001111
SCANCT
Boundary-control register scan
Boundary control
Test
All others
BYPASS
Bypass scan
Bypass
Normal
Bit 7 is used to maintain even parity in the 8-bit instruction.
The BYPASS instruction is executed in lieu of a SCOPE
instruction that is not supported in the ’ABTH18652A or ’ABTH182652A.
boundary scan
This instruction conforms to the IEEE Standard 1149.1-1990 EXTEST instruction. The BSR is selected in the
scan path. Data appearing at the device input and I/O pins is captured in the associated BSCs. Data that has
been scanned into the I/O BSCs for pins in the output mode is applied to the device I/O pins. Data present at
the device pins, except for output enables, is passed through the BSCs to the normal on-chip logic. For I/O pins,
the operation of a pin as input or output is determined by the contents of the output-enable BSCs (bits 47–44
of the BSR). When a given output enable is active (logic 0 for OEBA, logic 1 for OEAB), the associated I/O pins
operate in the output mode. Otherwise, the I/O pins operate in the input mode. The device operates in the test
mode.
identification read
This instruction conforms to the IEEE Standard 1149.1-1990 IDCODE instruction. The IDR is selected in the
scan path. The device operates in the normal mode.
sample boundary
This instruction conforms to the IEEE Standard 1149.1-1990 SAMPLE/PRELOAD instruction. The BSR is
selected in the scan path. Data appearing at the device input pins and I/O pins in the input mode is captured
in the associated BSCs, while data appearing at the outputs of the normal on-chip logic is captured in the BSCs
associated with I/O pins in the output mode. The device operates in the normal mode.
相關(guān)PDF資料
PDF描述
SN74ABTH1826520A Scan Test Devices With 18 Bit Universal Bus Transceivers And Registers( 掃描檢測裝置帶18位總線收發(fā)器和寄存器)
SN54ABTH18652A Scan Test Devices With 18 Bit Universal Bus Transceivers and Registers( 掃描檢測裝置，帶18位總線收發(fā)器和寄存器)
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