ISPGDX Datasheet, PDF (13/23 Pages) Lattice Semiconductor – In-System Programmable Generic Digital Crosspoint

Figure 7. Boundary Scan I/O Register Cell
SCANIN
M
(from
U
previous
X
cell)
DQ
M
U
DQ
X
Specifications ispGDX Family
Normal
Function ^M
OE ^U
DQ
X
TOE
EXTEST
Normal
Function ^M
OE ^U
DQ
X
I/O Pin
Update DR
M
U
DQ
SCANOUT (to next cell)
X
Shift DR
Clock DR
Figure 8. Boundary Scan State Machine
1 ^{Test-Logic-Reset}
0
1
0 ^{Run-Test/Idle}
1
Select-DR-Scan
0
1
Capture-DR
0
Shift-DR
0
1
Exit1-DR
1
0
Pause-DR ₀
1
0
Exit2-DR
1
Update-DR
1
0
1
Select-IR-Scan
0
1
Capture-IR
0
Shift-IR
0
1
Exit1-IR
1
0
Pause-IR ₀
1
0
Exit2-IR
1
Update-IR
1
0
TCK
tsu
th
TMS or
TDI
tco
TDO
tsu = 0.1µs (min.) th = 0.1µs (min.) tco = 0.1µs (min.)
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