EPM570 Altera, EPM570 Datasheet - Page 16

• Manufacturer Part Number: EPM570
• Description: MAX II Device Family
• Manufacturer: Altera

Logic Elements
Figure 2–7. LE in Normal Mode
Note to
(1)
2–10
MAX II Device Handbook, Volume 1
addnsub (LAB Wide)
data1
data2
data3
cin (from cout
of previous LE)
data4
This signal is only allowed in normal mode if the LE is at the end of an adder/subtractor chain.
Figure
(1)
2–7:
Register Feedback
preset/load, synchronous clear, synchronous load, and clock enable
control for the register. These LAB-wide signals are available in all LE
modes. The addnsub control signal is allowed in arithmetic mode.
The Quartus II software, in conjunction with parameterized functions
such as library of parameterized modules (LPM) functions, automatically
chooses the appropriate mode for common functions such as counters,
adders, subtractors, and arithmetic functions.
Normal Mode
The normal mode is suitable for general logic applications and
combinational functions. In normal mode, four data inputs from the LAB
local interconnect are inputs to a four-input LUT (see
Quartus II Compiler automatically selects the carry-in or the data3
signal as one of the inputs to the LUT. Each LE can use LUT chain
connections to drive its combinational output directly to the next LE in
the LAB. Asynchronous load data for the register comes from the data3
input of the LE. LEs in normal mode support packed registers.
4-Input
LUT
Register chain
connection
Core Version a.b.c variable
clock (LAB Wide)
(LAB Wide)
ena (LAB Wide)
aclr (LAB Wide)
sload
(LAB Wide)
sclear
(LAB Wide)
ADATA
ENA
D
ALD/PRE
aload
CLRN
Q
Figure
Altera Corporation
December 2004
Row, column, and
DirectLink routing
Row, column, and
DirectLink routing
Local routing
LUT chain
connection
Register
chain output
2–7). The