Altera Corporation
19
FLEX 10K Embedded Programmable Logic Device Family Data Sheet
Figure 9. FLEX 10K LE Operating Modes
Note:
(1)
Packed registers cannot be used with the cascade chain.
ENA
PRN
CLRN
DQ
4-Input
LUT
Carry-In
Cascade-Out
Cascade-In (1)
LE-Out to FastTrack
Interconnect
LE-Out to Local
Interconnect
ENA
Normal Mode
PRN
CLRN
DQ
Cascade-Out
LE-Out
Cascade-In
3-Input
LUT
Carry-In
3-Input
LUT
Carry-Out
Arithmetic Mode
Up/Down Counter Mode
data1 (ena)
data2 (u/d)
PRN
CLRN
D
Q
3-Input
LUT
Carry-In
Cascade-In
LE-Out
3-Input
LUT
Carry-Out
data3 (data)
data4 (nload)
1
0
Cascade-Out
Clearable Counter Mode
data1 (ena)
data2 (nclr)
PRN
CLRN
DQ
3-Input
LUT
Carry-In
LE-Out
3-Input
LUT
Carry-Out
data3 (data)
data4 (nload)
1
0
Cascade-Out
ENA
data1
data2
data3
data4
data1
data2
