Acculogic Boundary Scan controllers share a common set of powerful and patented capabilities that places them ahead of the competitors. These unique features facilitate:

• Proprietary 32-bit boundary scan controller ~ JPCI
• High speed data transmission ~ 25 Mega Bits/second
• Non-stop data transmission
• Support for long cable length ~ up-to 15 meters
• Gang programming and testing of multiple targets at the same time ~ 16 targets
• Boundary Scan Controlled digital channels with configurable scan chain

Controllers

Acculogic offers a wide range of high performance Boundary Scan controllers for use in test and device programming applications that are fully compliant with the IEEE1149.x standards.

• ScanMaster™ PCI
• ScanWalker CardBus
• Neva VXI-Scan
• Lynx PXI-Scan

High Performance 32-bit Bus Controller “JPCI”

JPCI (pronounced Gypsy) is a proprietary boundary scan bus controller, designed to provide the highest performance and unmatched reliability in the delivery of data to and from the device under test, using the IEEE 1149.1 serial protocol.

Key hardware features

• Adaptive clocking supports long cable length
• Programmable TCK = 30 MHz
• Non-stop data delivery rate (up to 25 Mbits/sec)
• Support for unlimited scan chain length
• Support for Addressable Scan Port – Multi-drop
• Support for non-compliant and proprietary TAP operations
• Support for multiple scan chains/voltage levels

Adaptive Clocking Technology™

Adaptive Clocking eliminates instabilities typically associated with boundary scan (JTAG) operation at high clock rates (TCK) due to path delays. This proprietary and patented design compensates for path delays allowing the JPCI controller to operate at the maximum TCK rate supported by the target devices.

• Clocking flexibility to achieve highest throughput
• Automatic compensation for path delays from 10nsec to 10 µsec - with 10 nsec resolution
• Reliable high-speed operation over long cable lengths without the use of Pods (system to DUT)
• Cable length of up to 15 meters (40 - 50 feet)

Adaptive clocking eliminates the effects of path delay allowing the JPCI controller to be located at an ergonomically suitable distance, up to 15 meters from the target.

What happens without Adaptive Clocking?

The IEEE 1149.1 standard stipulates the application of the data on one edge of the TCK and capture of the response on the next edge. The total amount of time available for the data to propagate to and from the target is limited to half of the TCK clock cycle, for example if TCK is set at 25MHz, then this time would be 20 nano seconds! If all the propagation delays are totaled, it will certainly exceed the available 20 nsec and therefore the operation will fail.

Our Competitors will suggest to you to:

• Keep the cables connecting the target to the controller as short as possible!!
• Reduce the TCK rate down until the operation becomes stable!!
• Use re-timing POD or cable!

These are not technically elegant solutions, they are crude work-arounds that may not work. They create:

• Impractical set-ups and pose extreme limitation on application of Boundary Scan in a real production environment
• Reliability problems can cause false/misdiagnosis
• Reduction of TCK rate will impact throughput, in device programming applications this will cause severe delays and wasted time
• Impedes the integration of Boundary Scan with other systems and processes

Non-stop Data Transmission

The Boundary Scan data transmission speed depends on the TCK rate and the transmission efficiency of the Bus controller. JPCI's Adaptive Clocking enables it to set the TCK rate to maximum frequency tolerable by the target device(s), and its sophisticated (& patented) multi-page memory backed TDI/TDO achieves up-to 99% transmission efficiency - unparalleled by any controller on the market.