參數(shù)資料
型號(hào)： LC5768MC-75F484C
廠商： LATTICE SEMICONDUCTOR CORP
元件分類： PLD
英文描述： 3.3V, 2.5V and 1.8V In-System Programmable eXpanded Programmable Logic Device XPLD⑩ Family
中文描述： EE PLD, 9.5 ns, PBGA484
封裝： FPBGA-484
文件頁(yè)數(shù)： 4/92頁(yè)
文件大小： 378K
代理商： LC5768MC-75F484C
Lattice Semiconductor
ispXPLD 5000MX Family Data Sheet
4
Cascading For Wide Operation
In several modes it is possible to cascade adjacent MFBs to support wider operation. Table 2 details the different
cascading options. There are chains of MFBs in each device which determine those MFBs that are adjacent for the
purposes of cascading. Table 3 indicates these chains. The ispXPLD 5000MX design tools automatically cascade
blocks if required by a particular design.
Table 2. Cascading Modes For Wide Support
Table 3. MFB Cascade Chain
SuperWIDE Logic Mode
In logic mode, each MFB contains 32 macrocells and a fully populated, programmable AND-array with 160 logic
product terms and four control product terms. The MFB has 68 inputs from the Global Routing Pool, which are
available in both true and complement form for every product term. It is also possible to cascade adjacent MFBs to
create a block with 136 inputs. The four control product terms are used for shared reset, clock, clock enable, and
output enable functions. Figure 3 shows the overall structure of the MFB in logic mode while Figure 4 provides a
more detailed view from the perspective of a macrocell slice.
Mode
Cascading Function
Logic
Input Width.
Arithmetic.
Memory Width Expansion.
Memory Width Expansion.
Allows two MFBs to act as a 136-input block.
Allow the carry chain to pass between two MFBs.
Allows MFBs to be cascaded for greater width support.
Allows up to four MFBs to be cascaded for greater width support.
FIFO
CAM
Device
MFBs in Cascade Chain
ispXPLD 5256MX
A
H -> G -> F -> E
A
→
B
→
P
→
Ο
→
D
→
C
→
E
→
F
→
H
→
G
→
I
→
J
→
→
B
→
C
→
D
ispXPLD 5512MX
C
N
B
G
F
K
→
D
M
A
H
E
→
E
L
X
I
D
→
F
K
W
J
→
C
N
→
→
G
J
→
V
K
→
B
O
→
→
H
→
→
→
→
I
ispXPLD 5768MX
→
→
→
→
→
L
U
→
M
T
→
N
S
→
O
AE
R
→
P
AD
T
Q
→
→
→
→
A
P
→
→
AF
Q
→
→
→
ispXPLD 51024MX
→
L
→
M
→
→
→
→
→
R
→
S
→
AC
U
→
V
AB
→
W
AA
→
Z
→
Y
→
→
→
→
→
→
→
→
→
X
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