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Test and Debug
AMD-K5 Processor Technical Reference Manual
18524C/0—Nov1996
The TAP consists of the following:
■
Test Access Port (TAP) Controller—A synchronous, finite
state machine that decodes the inputs on the TMS signal to
control a sequence of test operations.
■
Instruction Register (IR)—Accepts serially shifted instruc-
tions from the TDI input. The instructions select the test or
debug operation to be performed, the Test Data Register
(TDR) to be accessed, or both.
■
Test Data Registers (TDRs)—Used to process the test data.
Each TDR is addressed by an instruction in the Instruction
Register (IR). The processor includes the following TDRs:
•
Boundary Scan Register (BSR)—Contains cells connected
to all of the processor’s input and output signals as well
as cells for I/O float control. It allows serial data to be
written into or read from the processor boundary. The
register is controlled with the EXTEST and SAMPLE in-
structions.
•
Device Identification Register (DIR)—Contains the codes
for manufacturer's identification, part number, and ver-
sion.
•
Bypass Register (BR)—A path between TDI and TDO
used to transfer test data to and from other board com-
ponents when no test operation is being performed by
the processor.
•
Hardware Debug Tool Register (HDTR)—Selected by the
USEHDT instruction to connect TDI and TDO, allowing
HDT instructions to be executed.
•
Built-In Self-Test Result Register (BISTRR)—Selected by
the RUNBIST instruction to connect TDI and TDO, al-
lowing the result of executing the RUNBIST to be
shifted out after the completion of BIST.
■
The test signals are as follows:
•
TCK—The clock for all TAP testing
•
TDI—Input test data and instructions
•
TDO—Output data
•
TMS—Test functions and sequence of test changes
•
TRST—Test reset
Boundary-scan testing uses shift registers in boundary scan
cells located between the processor’s internal logic and I/O
Summary of Contents for AMD-K5
Page 1: ...AMD K5 Processor Technical Reference Manual TM...
Page 10: ...x AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 24: ...1 4 Overview AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 54: ...2 30 Internal Architecture AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 116: ...4 26 Performance AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 356: ...6 44 System Design AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 380: ...7 24 Test and Debug AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 396: ...A 16 AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...
Page 406: ...I 10 Index AMD K5 Processor Technical Reference Manual 18524C 0 Nov1996...