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參數(shù)資料
| 型號： | SCANSTA112 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 7-port Multidrop IEEE 1149.1 (JTAG) Multiplexer |
| 中文描述： | 7端口多點(diǎn)的IEEE 1149.1（JTAG接口）多路復(fù)用 |
| 文件頁數(shù)： | 2/15頁 |
| 文件大?。?/td> | 300K |
| 代理商： | SCANSTA112 |
Introduction
The SCANSTA112 is the third device in a series that enable
multi-drop address and multiplexing of IEEE-1149.1 scan
chains. The SCANSTA112 is a superset of its predecessors
- the SCANPSC110 and the SCANSTA111. The STA112 has
all features and functionality of these two previous devices.
The STA112 is essentially a support device for the IEEE
1149.1 standard. It is primarily used to partition scan chains
into managable sizes, or to isolate specific devices onto a
seperate chain (
Figure 1
). The benefits of multiple scan
chains are improved fault isolation, faster test times, faster
programiing times, and smaller vector sets.
In addition to scan chain partitioning, the device is also
addressable for use in a multidrop backplane environment
(
Figure 2
). In this configuration, multiple IEEE-1149.1 acces-
sible cards with an STA112 on board can utilize the same
backplane test bus for system-level IEEE-1149.1 access.
This approach facilitates a system-wide commitment to
structural test and programming throughout the entire sys-
tem life sycle.
Architecture
Figure 3
shows the basic architecture of the ’STA112. The
device’s major functional blocks are illustrated here.
The TAP Controller, a 16-state state machine, is the central
control for the device. The instruction register and various
test data registers can be scanned to exercise the various
functions of the ’STA112 (these registers behave as defined
in IEEE Std. 1149.1).
The ’STA112 selection controller provides the functionality
that allows the 1149.1 protocol to be used in a multi-drop
environment. It primarily compares the address input to the
slot identification and enables the ’STA112 for subsequent
scan operations.
The Local Scan Port Network (LSPN) contains multiplexing
logic used to select different port configurations. The LSPN
control block contains the Local Scan Port Controllers
(LSPC) for each Local Scan Port (LSP
0
, LSP
1
... LSP
n
). This
control block receives input from the ’STA112 instruction
register, mode registers, and the TAP controller. Each local
port contains all four boundary scan signals needed to inter-
face with the local TAPs plus the optional Test Reset signal
(TRST).
The TDI/TDO Crossover Master/Slave logic is used to define
the bidirectional B0 and B1 ports in a Master/Slave
configuration.
20051251
FIGURE 2. Example of SCANSTA112 in a multidrop addressable backplane.
S
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SCANSTA112_05 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:7-Port Multidrop IEEE 1149.1 (JTAG) Multiplexer |
| SCANSTA112EVK | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 SCANSTA112 EVAL KIT 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 |
| SCANSTA112EVK/NOPB | 功能描述:界面開發(fā)工具 SCANSTA112 EVAL KIT RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V |
| SCANSTA112SM | 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 |
| SCANSTA112SM/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 |
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