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參數(shù)資料
| 型號(hào)： | SCANSTA112VS |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 7-port Multidrop IEEE 1149.1 (JTAG) Multiplexer |
| 中文描述： | SPECIALTY MICROPROCESSOR CIRCUIT, PQFP100 |
| 封裝： | TQFP-100 |
| 文件頁(yè)數(shù)： | 8/15頁(yè) |
| 文件大小： | 300K |
| 代理商： | SCANSTA112VS |
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Application Overview
(Continued)
such a configuration, the system tester can configure the
local ports of a set of ’STA112s so as to connect a specific
set of local scan-chains to the active scan chain. Using this
capability, the tester can selectively communicate with spe-
cific portions of a target system. The tester’s scan port is
connected to the backplane scan port of a root layer of
’STA112s, each of which can be selected using multi-drop
addressing. A second tier of ’STA112s can be connected to
this root layer, by connecting a local port (LSP) of a root-
layer ’STA112 to the backplane port of a second-tier
’STA112. This process can be continued to construct a multi-
level scan hierarchy. ’STA112 local ports which are not cas-
caded into higher-level ’STA112s can be thought of as the
terminal leaves of a scan tree. The test master can select
one or more target leaves by selecting and configuring the
local ports of an appropriate set of ’STA112s in the test tree.
STANDARD SCANBRIDGE MODE
- ScanBridge mode re-
fers to functionality and protocol that has been used by
National since the introduction of the PSC110 in 1993. This
functionality consists of a multidrop addressable IEEE1149.1
switch. This enables one (or more) device to be selected
from many that are connected to a parallel IEEE1149.1 bus
or backplane. The second function that ScanBridge mode
accomplishes is to act as a mux for multiple IEEE1149.1
local scan chains. The Local Scan Ports (LSP) of the device
creates a connection between one or more of the local scan
chains to the backplane bus.
To accomplish this functionality the ScanBridge has two
levels of protocol and an operational mode. Level 1 protocol
refers to the required actions to address/select the desired
ScanBridge. Level 2 protocol is required to configuring the
mux’ing function and enable the connection (UNPARK) be-
tween the local scan chain and the backplane bus via an
LSP. Upon completion of level 1 and 2 protocols the Scan-
Bridge is prepared for its operational mode. This is where
scan vectors are moved from the backplane bus to the
desired local scan chain(s).
STITCHER MODE
- Stitcher Mode is a method of skipping
level 1 and 2 protocol of the ScanBridge mode of operation.
This is accomplished via external pins. When in stitcher
mode the SCANSTA112 will go directly to the operational
mode.
TRANSPARENT MODE
- Transparent mode refers to a
condition of operation in which there are no pad-bits or
SCANSTA112 registers in the scan chain. The Transparent
mode of operation is available in both ScanBridge and
Stitcher modes. Only the activation method differs. Once
transparent mode has been activated there is no difference
in operation. Transparent mode allows for the use of vectors
that have been generated for a chain where these bits were
not included.
Check with your ATPG tool vendor to ensure support of
these features.
For details regarding the internal operation of the SCAN-
STA112 device, refer to applications note AN-1259 SCAN-
STA112 Designers Reference.
S
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SCANSTA112VS/NOPB | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 7-port Multidrop Mux RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時(shí)間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| SCANSTA112VS/NOPB | 制造商:Texas Instruments 功能描述:, Termination:Solder, Package/Case:100-T |
| SCANSTA112VSX | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時(shí)間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| SCANSTA112VSX/NOPB | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)量（輸入/輸出）:2 / 12 傳播延遲時(shí)間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| SCANSTA476 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Eight Input IEEE 1149.1 Analog Voltage Monitor |
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