7-22
Test and Debug
AMD-K5 Processor Technical Reference Manual
18524C/0—Nov1996
7.8.2
Public Instructions
The processor supports all three IEEE-mandatory instructions
(BYPASS, SAMPLE/PRELOAD, EXTEST), three IEEE-
optional instructions (IDCODE, HIGHZ, RUNBIST), and three
instructions unique to the AMD-K5 processor (ALL1, ALL0,
USEHDT). Table 7-6 shows the complete set of public TAP
instructions supported by the processor. In addition, the pro-
cessor implements several private manufacturing test instruc-
tions.
The IEEE standard describes the mandatory and optional
instructions. The ALL1 and ALL0 instructions simply force all
outputs and bidirectionals High or Low. The USEHDT instruc-
tion is described below. Any instruction encodings not shown
in Table 7-6 select the BYPASS instruction.
Table 7-6. Public TAP Instructions
Instruction
Encoding
Register
Description
EXTEST
00000
BSR
As defined by the IEEE standard
SAMPLE/
PRELOAD
00001
BSR
As defined by the IEEE standard
IDCODE
00010
DIR
As defined by the IEEE standard
HIGHZ
00011
BR
As defined by the IEEE standard
ALL1
00100
BR
Forces all outputs and bidirectionals High
ALL0
00101
BR
Forces all outputs and bidirectionals Low
USEHDT
00110
HDTR
Accesses the Hardware Debug Tool (HDT)
1
See Section 7.9 on page 7-23
RUNBIST
00111
BISTRR
As defined by the IEEE standard
BYPASS
11111
BR
As defined by the IEEE standard
BYPASS
undefined
BR
Undefined instruction encodings select the BYPASS
instruction
Notes:
1. Documentation on the Hardware Debug Tool (HDT) is available from AMD under a nondisclosure agreement.
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...