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