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Parallel Cable IV
Figure 2-2 Top View of the Parallel Cable IV
The new Xilinx Parallel Cable IV (PC IV) is a high-speed download cable that configures or programs all Xilinx FPGA, CPLD, ISP PROM, and System ACE MPM devices. The cable takes advantage of the IEEE 1284 ECP protocol and Xilinx iMPACT software to achieve download speeds that are over 10 times faster than the PC III. The cable automatically senses and adapts to target I/O voltages and is able to accommodate a wide range of I/O standards from 1.5V to 5V.
PC IV supports the widely used industry standard IEEE 1149.1 Boundary Scan (JTAG) specification using a four-wire interface. It also supports the Xilinx Slave Serial mode for Xilinx FPGA devices. It interfaces to target systems using a ribbon cable that features integral alternating ground leads to reduce noise and increase signal integrity.
The cable is externally powered from either a power brick or by interfacing to a standard PC mouse or keyboard connection. A
bi-color status LED indicates the presence of operating and target reference voltages.Connecting to Host Computer
The PC IV connects to any PC using Win98, Win2000, or WinNT (4.0 or higher) through the standard IEEE 1284 DB25 parallel (printer) port connector. To fully utilize the higher speeds of this cable, the host PC must have a parallel port that is enabled to support extended capability port (ECP) mode. If ECP mode is not enabled, the PC IV will default to compatibility mode and will not run at the optimum speeds listed.
Cable Power
The host interface cable (Figure 2-3) includes a short power jack for connection to one of two possible +5V DC power sources: (1) an external AC adapter or (2) the keyboard or mouse port of the host PC (shown). The supplied power splitter cable is required when using the first option. The splitter cable is installed between the mouse cable and the standard 6-pin mini-DIN (PS2) connector on the host PC. PC IV operating current is less than 100 mA. It draws approximately 15 mA from the target board's reference voltage supply to power the JTAG/Slave Serial buffers.
Figure 2-3 Parallel Cable IV Parallel and PS2 Connection
High Performance Ribbon Cable
An insulation displacement (IDC) ribbon cable is supplied and recommended for connection to target systems. This cable incorporates multiple signal-ground pairs and facilitates error-free connection. A very small footprint, keyed mating connector is all that is required on the target system. Refer to RD Redigure for the appropriate connector pin assignments and sample vendor part numbers.
The Parallel Cable IV can also interface to target systems using flying lead wires. However, these are not included with PC IV and can be purchased separately from the Xilinx E-Commerce web site.
Figure 2-4 High Performance Ribbon Cable
Note Ribbon Cable - 14 conductor 1.0mm centers Round Conductor Flat Cable; 28 AWG (7x36) stranded copper conductors; gray PVC with pin 1 edge marked.
Note 2mm Ribbon Female Polarized Connectors - IDC connection to ribbon; contacts are beryllium copper plated; 30 micro inches gold plating over 50 micro inches nickel; connectors mate to 0.5mm square posts on 2mm centers.
Target Board Header
Figure 2-5 Target Interface Connector Signal Assignments
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