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參數資料
| 型號： | SN74ABT18502PMR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 總線收發(fā)器 |
| 英文描述： | ABT SERIES, DUAL 9-BIT BOUNDARY SCAN REG TRANSCEIVER, TRUE OUTPUT, PQFP64 |
| 封裝： | GREEN, PLASTIC, LQFP-64 |
| 文件頁數： | 2/32頁 |
| 文件大小： | 578K |
| 代理商： | SN74ABT18502PMR |
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SN74ABT18502
SCAN TEST DEVICE
WITH 18-BIT REGISTERED BUS TRANSCEIVER
SCBS753 – FEBRUARY 2002
10
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
boundary-control register (BCR)
The 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. BCR 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 shown in Figure 3.
Bit 0
TDO
TDI
Figure 3. Bypass Register Order of Scan
device identification register (IDR)
The device IDR is 32 bits long. It can be selected and read to identify the manufacturer, part number, and version
of this device.
During Capture-DR, the binary value 00000000000000000110000000101111 (0000602F, hex) is captured in
the device IDR to identify this device as the TI SN74ABT18502, version 0. The device IDR order of scan is from
TDO through bits 31–0 to TDO. Table 3 shows the device IDR bits and their significance.
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相關代理商/技術參數 |
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|---|---|
| SN74ABT18502PMRG4 | 功能描述:特定功能邏輯 W/18-Bit Univ Bus Trncvr RoHS:否 制造商:Texas Instruments 產品: 系列:SN74ABTH18502A 工作電源電壓:5 V 封裝 / 箱體:LQFP-64 封裝:Tube |
| SN74ABT18502PN | 制造商:TI 功能描述:74ABT18502 S1A4B |
| SN74ABT18504 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SCAN TEST DEVICES WITH 20-BIT UNIVERSAL BUS TRANSCEIVERS |
| SN74ABT18504PM | 功能描述:特定功能邏輯 Device w/20-Bit Univ Bus Transceiver RoHS:否 制造商:Texas Instruments 產品: 系列:SN74ABTH18502A 工作電源電壓:5 V 封裝 / 箱體:LQFP-64 封裝:Tube |
| SN74ABT18504PMG4 | 功能描述:特定功能邏輯 Device w/20-Bit Univ Bus Transceiver RoHS:否 制造商:Texas Instruments 產品: 系列:SN74ABTH18502A 工作電源電壓:5 V 封裝 / 箱體:LQFP-64 封裝:Tube |
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