Hardware Debug Tool (HDT) 7-23
18524C/0—Nov1996 AMD-K5 Processor Technical Reference Manual
7.9 Hardware Debug Tool (HDT)
The Hardware Debug Tool (HDT)—sometimes referred to as
the debug port or Probe mode—is a collection of signals, regis-
ters, and processor microcode that is enabled when external
debug logic drives R/S Low or loads the processor’s Test Access
Port (TAP) instruction register with the USEHDT instruction.
Documentation on the HDT is available under nondisclosure
agreement to test and debug developers. For information, con-
tact your AMD sales representative or field application engi-
neer.
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