參數(shù)資料
型號(hào)： SN74BCT8240ANT
廠商： Texas Instruments, Inc.
英文描述： SCAN TEST DEVICES WITH OCTAL INVERTING BUFFERS
中文描述： 掃描測(cè)試設(shè)備與八進(jìn)制反向緩沖器
文件頁(yè)數(shù)： 13/26頁(yè)
文件大?。?/td> 473K
代理商： SN74BCT8240ANT
SN54BCT8240A, SN74BCT8240A
SCAN TEST DEVICES
WITH OCTAL INVERTING BUFFERS
SCBS067E – FEBRUARY 1990 – REVISED DECEMBER 1996
13
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
parallel-signature analysis (PSA)
Data appearing at the device input terminals is compressed into a 16-bit parallel signature in the shift-register
elements of the BSCs on each rising edge of TCK. This data is then updated in the shadow latches of the input
BSCs and applied to the inputs of the normal on-chip logic. Data in the shadow latches of the output BSCs
remains constant and is applied to the device outputs. Figure 6 shows the 16-bit linear-feedback shift-register
algorithm through which the signature is generated. An initial seed value should be scanned into the BSR before
performing this operation.
=
1A1
1Y1
1A2
1A3
1A4
2A1
2A2
2A3
2A4
1Y2
1Y3
1Y4
2Y1
2Y2
2Y3
2Y4
=
Figure 6. 16-Bit PSA Configuration
simultaneous PSA and PRPG (PSA/PRPG)
Data appearing at the device input terminals is compressed into an 8-bit parallel signature in the shift-register
elements of the input BSCs on each rising edge of TCK. This data is then updated in the shadow latches of the
input BSCs and applied to the inputs of the normal on-chip logic. At the same time, an 8-bit pseudo-random
pattern is generated in the shift-register elements of the output BSCs on each rising edge of TCK, updated in
the shadow latches, and applied to the device output terminals on each falling edge of TCK. Figure 7 shows
the 8-bit linear-feedback shift-register algorithm through which the signature and patterns are generated. An
initial seed value should be scanned into the BSR before performing this operation. A seed value of all zeroes
will not produce additional patterns.
=
1A1
1Y1
1A2
1A3
1A4
2A1
2A2
2A3
2A4
1Y2
1Y3
1Y4
2Y1
2Y2
2Y3
2Y4
=
Figure 7. 8-Bit PSA/PRPG Configuration
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
SN74BCT8240ANTE4 功能描述:特定功能邏輯 Device w/Octal Inverting Buffers RoHS:否 制造商:Texas Instruments 產(chǎn)品: 系列:SN74ABTH18502A 工作電源電壓:5 V 封裝 / 箱體:LQFP-64 封裝:Tube
SN74BCT8244ADW 功能描述:特定功能邏輯 Device w/Octal Buffers RoHS:否 制造商:Texas Instruments 產(chǎn)品: 系列:SN74ABTH18502A 工作電源電壓:5 V 封裝 / 箱體:LQFP-64 封裝:Tube
SN74BCT8244ADWE4 功能描述:特定功能邏輯 Device w/Octal Buffers RoHS:否 制造商:Texas Instruments 產(chǎn)品: 系列:SN74ABTH18502A 工作電源電壓:5 V 封裝 / 箱體:LQFP-64 封裝:Tube
SN74BCT8244ADWG4 功能描述:特定功能邏輯 IEEE Std 1149.1 Bndry Scan Tst Devic RoHS:否 制造商:Texas Instruments 產(chǎn)品: 系列:SN74ABTH18502A 工作電源電壓:5 V 封裝 / 箱體:LQFP-64 封裝:Tube
SN74BCT8244ADWR 功能描述:特定功能邏輯 Device w/Octal Buffers RoHS:否 制造商:Texas Instruments 產(chǎn)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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