PIO-1149.1/E Corelis Parallel Port Controller

The Corelis PIO-1149.1/E Parallel Port Controller provides the simplest possible solution to interfacing a PC with any IEEE Standard 1149.1 compatible target. The PIO-1149.1/E controls the operation of an IEEE Standard 1149.1 (JTAG) scan test path by generating the proper signals under software control to interface with the target devices. With the PIO-1149.1/E, you can control boundary-scan operations per IEEE Standard 1149.1 through software. You can command target circuitry Built-In-Self-Test (BIST), verify PCB interconnects, perform functional testing and debug without manual probing. Furthermore, you can access device internal functions that are not accessible to external probing through the JTAG interface, to isolate faults within the device itself.

The PIO-1149.1/E TCK output to the IEEE Standard 1149.1 compatible target system is programmable under software control. Allowable frequencies range from 1 MHz to 40 MHz. The voltage level of the parallel I/O and JTAG TAP interfaces is software-programmable and you can set it to any voltage between 1.25 V and 3.40 V in increments of 0.05 V. These interfaces are TTL compatible and 5 V tolerant. You can configure the four discrete I/O pins through software as standard inputs, outputs, or open collector drivers to test or control non-boundary-scan areas of the UUT. Direct software control to drive, sense, and tri-state each of the four pins provides this configurability. The input and output ports can control and sense various functions in the target system that you cannot control or observe through boundary-scan operations. These ports are useful for testing of target systems that incorporate components that do not comply with IEEE Standard 1149.1.

The PIO-1149.1/E has a built-in self-test capability. Internal loop-back logic validates shift integrity for the JTAG TAP. The unit can also read back programmable voltage levels as well as discrete I/O pins. The PIO-1149.1/E is a full-speed device compliant with IEEE-1284 ECP Mode Phase. Refer to IEEE Standard Signaling Method for a Bi-directional Parallel Peripheral Interface for Personal Computers Specification (IEEE Std 1284-1994).