Device::Jtag::PP - Perl extension for communicating with JTAG devices via PC parallel port.

EXPORT

PREREQUISITES
CONSTRUCTOR
METHODS
HISTORY
SEE ALSO
AUTHOR
COPYRIGHT AND LICENSE

NAME

Device::Jtag::PP - Perl extension for communicating with JTAG devices via PC parallel port.

SYNOPSIS

  use Device::Jtag::PP;
  my $jtag = Device::Jtag::PP->new();
  $jtag->autodetect();
  $jtag->shiftir($device_number, $binary_string);
  $jtag->shiftdr($device_number, $binary_string);

DESCRIPTION

Facilitates communication with JTAG devices using the Windows parallel port driving a Digilent Parallel Cable 3 (commonly shipped with Xilinx Spartan-3 FPGA evaluation boards).

EXPORT

None by default.

PREREQUISITES One must install the Perl module Device-Parallel port, which in turn requires that the file inpout32.dll available from http://www.logix4u.net/inpout32.htm be copied to the Windows\sytem32 folder.

CONSTRUCTOR =head2 new =over 4 =item `new()` Creates a `Device::Jtag::PP` =back

METHODS =over 4 =item `initialize()` Initializes the devices on the JTAG chain to the RTI state.

autodetect() Auto detects devices on the JTAG scan chain by shiting out 32-bit IDCODE register values for each device on the chain. The subroutine idcode_lookup is called for each 32 bit value to assign information for that device. Currently, only the IDCODEs for Spartan-3 and XCF0xS Flash PROMs are available, but the user can easily add his own.
shiftir(DEVICE, BIT_STRING) Shift BIT_STRING (a simple string of 0's and 1's) to the instruction register of device number DEVICE (integer) on the JTAG chain. All other devices on the chain get the BYPASS instruction. The device closest to the PC's outgoing serial data is defined as device 0. The length of BIT_STRING must match the number of bits defined for that device's instruction register.

HISTORY =over =item 0.1 - First release Basic first release. IDCODE support for Spartan-3 and XCF0xS Flash PROM devices only. =back

AUTHOR

Toby Deitrich, <tdeitrich@cpan.org>

COPYRIGHT AND LICENSE

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself, either Perl version 5.8.8 or, at your option, any later version of Perl 5 you may have available.

Device::Jtag::PP - Perl extension for communicating with JTAG devices via PC parallel port.