参数资料
型号: OR4E042BM416-DB
厂商: LATTICE SEMICONDUCTOR CORP
元件分类: FPGA
英文描述: FPGA, 1296 CLBS, 380000 GATES, PBGA416
封装: PLASTIC, FBGA-416
文件页数: 61/151页
文件大小: 2680K
代理商: OR4E042BM416-DB
Lattice Semiconductor
17
Data Sheet
September, 2002
ORCA Series 4 FPGAs
Programmable Logic Cells (continued)
In the third submode, multiplier submode, a single
PFU can affect an 8x1 bit (4x1 for half-ripple mode)
multiply and sum with a partial product (see Figure 11).
The multiplier bit is input at F5[A:C], respectively per
nibble, and the multiplicand bits are input at KZ[1],
where K7[1] is the most signicant bit (MSB). KZ[0] con-
tains the partial product (or other input to be summed)
from a previous stage. If F5[A:C] is logical 1, the multi-
plicand is added to the partial product. If F5[A:C] is log-
ical 0, 0 is added to the partial product, which is the
same as passing the partial product. CIN/FCIN can
bring the carry-in from the less signicant PFUs if the
multiplicand is wider than 8 bits, and COUT/FCOUT
holds any carry-out from the multiplication, which may
then be used as part of the product or routed to another
PFU in multiplier mode for multiplicand width expan-
sion.
Ripple mode’s fourth submode features equality
comparators. The functions that are explicitly available
are A B, A
B, and A B, where the value for A is
input on KZ[0], and the value for B is input on KZ[1]. A
value of 1 on the carry-out signals valid argument. For
example, a carry-out equal to 1 in AB submode indi-
cates that the value on KZ[0] is greater than or equal to
the value on KZ[1]. Conversely, the functions A B,
A + B, and A > B are available using the same func-
tions but with a 0 output expected. For example, A
> B
with a 0 output indicates A B. Table 4 shows each
function and the output expected.
If larger than 8 bits, the carry-out signal can be cas-
caded using fast-carry logic to the carry-in of any adja-
cent PFU. The use of this submode could be shown
using Figure 9, except that the CIN/FCIN input for the
least signicant PFU is controlled via conguration.
Table 4. Ripple Mode Equality Comparator
Functions and Outputs
5-5757(F)
Key: C = conguration data.
Note: F5[A:C] shorted together
Figure 11. Multiplier Submode
Equality
Function
ORCA Foundry
Submode
True, if
Carry-Out Is:
A BA B1
A BA B1
A ≠ BA ≠ B1
A < B
A B0
A > B
A B0
A = B
A ≠ B0
K7[1]
K7[0]
+
D
Q
C
DQ
1
00
K7
F5[A:C]
K4[1]
K4[0]
+
D
Q
1
00
K4
K3[1]
K3[0]
+
D
Q
1
00
K3
K2[1]
K2[0]
+
D
Q
1
00
K2
K1[1]
K1[0]
+
D
Q
1
00
K1
K6[1]
K6[0]
+
D
Q
1
00
K6
K5[1]
K5[0]
+
D
Q
1
00
K5
K0[1]
K0[0]
+
D
Q
1
00
K0
Q0
F0
Q1
F1
Q2
F2
Q3
F3
Q4
F4
Q5
F5
Q6
F6
Q7
F7
COUT
REGCOUT
相关PDF资料
PDF描述
OR4E042BM680-DB FPGA, 1296 CLBS, 380000 GATES, PBGA680
OR4E043BA352-DB FPGA, 1296 CLBS, 380000 GATES, PBGA352
OR4E043BM416-DB FPGA, 1296 CLBS, 380000 GATES, PBGA416
OR4E043BM680-DB FPGA, 1296 CLBS, 380000 GATES, PBGA680
OR4E061BA352-DB FPGA, 2024 CLBS, 515000 GATES, PBGA352
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