SA1110 Datasheet, PDF (381/406 Pages) Intel Corporation – Intel StrongARM SA-1110 Microprocessor

Boundary-Scan Test Interface
The EXTEST guard values should be clocked into the boundary-scan register (using the
SAMPLE/PRELOAD instruction) before the EXTEST instruction is selected, to ensure that known
data is applied to the core logic during the test. These guard values should also be used when new
EXTEST vectors are clocked into the boundary-scan register.
The values stored in the BS register after power-up are not defined. Similarly, the values previously
clocked into the BS register are not guaranteed to be maintained across a boundary-scan reset
(from forcing nTRST low or entering the Test Logic Reset state).
Figure 16-3, Figure 16-4, and Figure 16-5 show the typical timing for the BS register.
16.7 Boundary-Scan Interface Signals
Figure 16-3. Boundary-Scan General Timing
Tbscl
Tbsch
tck
tms, tdi
tdo
Data In
Data Out
Tbsis
Tbsih
Tbsoh
Tbsod
Tbsss
Tbssh
Tbsdh
Tbsdd
A4772-01
SA-1110 Developer’s Manual
16-7