
Product Overview 1-1
Introduction
The NetUSB-1149.1, NetUSB-1149.1/E and NetUSB-1149.1/SE High-Speed Boundary-Scan
(JTAG) Controllers are members of the Corelis ScanPlus™ and ScanExpress™ family of scan-
based test, analysis, and diagnostic tools. They are managed by a PC host, which is linked with
either a USB2.0 (compatible with USB1.1) interface, or over 10/100 Ethernet network. Under host
direction, the NetUSB-1149.1, NetUSB-1149.1/E and NetUSB-1149.1/SE test one or more IEEE
Standard 1149.1 compatible target board (UUT). The NetUSB-1149.1 family is designed to control
the operation of one or more IEEE Standard 1149.1 boundary-scan (JTAG) test access ports
(TAPs) by generating the proper signals as dictated by software. This provides stimulus and accepts
response signals of the attached customer target circuits, enabling their testing and/or programming.
This capability is supported by memory-behind-the-pin architecture driving scan operations at
continuous JTAG clock (TCK) speeds of up to 70 MHz.
The NetUSB-1149.1 family facilitates software-controlled boundary-scan operations per the IEEE
Standard 1149.1. It provides command visibility to the target’s Test Access Port (TAP), accessing
device internal registers and on-chip debugger, verifying PCB interconnects, performing functional
testing, and debug without manual probing. The JTAG interface provides access to internal device
functions that are not accessible via external probing, enabling fault isolation within the device itself.
The JTAG interface also enables programming target FLASH and CPLD devices, as well as data
downloading and uploading to and from the target memory devices.
Either of the NetUSB-1149.1 type controllers can also be used to perform microprocessor
emulation via that device’s JTAG port. This facilitates firmware development by providing single-
step, break, and content update/visibility access.
There are three models of this product. The basic NetUSB-1149.1 (no /E or /SE suffix) has
scanning access through a single SCSI II 68-pin connector. This supports a single direct target TAP
operation with the appropriate cable. With a different cable type, it implements the Corelis
ScanExpress expansion bus to operate a remote intelligent pods, such as the ScanTAP-4, ScanTAP-
8, ScanTAP-32, or ScanHUB (in turn accessing more of the ScanTAP intelligent pods). The
NetUSB-1149.1/E and NetUSB-1149.1/SE models are capable of scanning multiple TAPs
concurrently when used with the ScanExpress Runner software which is sold separately.
The NetUSB-1149.1/E model is similar to the NetUSB-1149.1 above, but has the equivalent of a
ScanTAP-4 remote pod built-in as an integral resource, enabling it to operate up to four boundary-
scan TAPs simultaneously. Note that the external SCSI connector on this unit is not used and no
external ScanTAP pod is required.
The NetUSB-1149.1/SE model is similar to the NetUSB-1149.1/E except that it contains a built in
ScanTAP-8 pod as an integral resource, enabling it to operate up to eight target TAPs
simultaneously, with no other external equipment And therefore the NetUSB-1149.1/SE model
does not use the external SCSI connector.
Chapter 1
Product Overview
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