Boundary-Scan Test Access Port (TAP)
7-21
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AMD-K5 Processor Technical Reference Manual
buffers to control and observe the behavior of signals at each
pin. The boundary scan cells form a serial shift-register chain,
called a Boundary Scan Register (BSR), around the processor’s
internal logic. Test data is shifted through the boundary-scan
chain by a test program. If all the components on a board
implement this boundary-scan architecture, a single serial
path can be used to test component interconnections.
Parallel output registers are fed by the shift registers. Parallel
data is loaded into the shift register when the TAP controller
exits the capture state (capture_DR or capture_IR). The shift
registers then shift data from TDI to TDO in the shift state
(shift_DR or shift_IR). The parallel output registers hold the
current data while new data is shifted into the shift registers.
The output registers are updated when the controller exits the
update state (update_DR or update_IR).
The sections below describe only those aspects of the IEEE
standard that are implemented uniquely by the AMD-K5 pro-
cessor. For a description of the IEEE-mandatory TAP functions
and the IEEE optional functions implemented by the AMD-K5
processor, see the IEEE Standard Test Access Port and Boundary-
Scan Architecture (IEEE 1149.1-1990) specification.
7.8.1
Device Identification Register
The format of the Device Identification Register (DIR) is
shown in Table 7-5. The fields include the following values:
■
Version Number—This is incremented by AMD manufactur-
ing for each major revision of silicon.
■
Bond Option—The two bits of the bond option depend on
how the part is bonded at the factory.
■
Part Number—This identifies the specific processor model.
■
Manufacturer—This is actually only 11 bits (11–1). The
least-significant bit, bit 0, is always set to 1, as specified by
the IEEE standard.
Table 7-5. Test Access Port (TAP) ID Code
Version
(Bits 31–28)
Bond Option
(Bits 27–26)
Part Number
(Bits 25–12)
Manufacturer
(Bits 11–0)
Xh
XXb
05XXh
001h
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...