xc4000h Xilinx Corp., xc4000h Datasheet - Page 17

• Manufacturer Part Number: xc4000h
• Description: Logic Cell Array Families
• Manufacturer: Xilinx Corp.

Figure 16. XC4000 Boundary Scan Logic. Includes three bits of Data Register per IOB, the IEEE 1149.1 Test Access Port
TDO
TDI
M
U
X
IOB
IOB
IOB
IOB
IOB
IOB
IOB
IOB
IOB
IOB
IOB
IOB
IOB
IOB
controller, and the Instruction Register with decodes.
IOB
IOB
INSTRUCTION REGISTER
IOB
INSTRUCTION REGISTER
IOB
REGISTER
REGISTER
BYPASS
BYPASS
IOB
IOB
IOB
IOB
IOB
IOB
IOB
IOB
IOB
IOB
IOB
IOB
IOB
IOB
IOB
IOB
IOB
IOB
IOB
IOB
M
U
X
TDI
TDO
2-23
IOB.Q
IOB.T
IOB.Q
IOB.T
IOB.I
IOB.I
IOB.O
CAPTURE
SHIFT /
DATAOUT
DATA IN
1
1
1
1
1
1
1
0
0
0
0
0
0
0
CLOCK DATA
REGISTER
D
D
D
D
D
D
D
sd
Q
Q
Q
Q
Q
Q
Q
UPDATE
LE
LE
LE
LE
LE
LE
LE
D
D
D
D
D
D
D
sd
sd
sd
sd
sd
sd
sd
Q
Q
Q
Q
Q
Q
Q
1
0
1
1
0
0
0
0
1
1
1
0
1
0
EXTEST
X1523