LC4000C LATTICE [Lattice Semiconductor], LC4000C Datasheet - Page 26
LC4000C
Manufacturer Part Number
LC4000C
Description
3.3V/2.5V/1.8V In-System Programmable SuperFAST High density PDLs
Manufacturer
LATTICE [Lattice Semiconductor]
Datasheet
1.LC4000C.pdf
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Lattice Semiconductor
Timing Model
The task of determining the timing through the ispMACH 4000 family, like any CPLD, is relatively simple. The timing
model provided in Figure 11 shows the specific delay paths. Once the implementation of a given function is deter-
mined either conceptually or from the software report file, the delay path of the function can easily be determined
from the timing model. The Lattice design tools report the timing delays based on the same timing model for a par-
ticular design. Note that the internal timing parameters are given for reference only, and are not tested. The exter-
nal timing parameters are tested and guaranteed for every device. For more information on the timing model and
usage, please refer to Technical Note TN1004: ispMACH 4000 Timing Model Design and Usage Guidelines.
Figure 11. ispMACH 4000 Timing Model
SCLK
OE
Feedback
IN
From
t
Delays
GCLK_IN
t
In/Out
t
GOE
t
t
IOI
IOI
IN
t
IOI
t
t
INREG
INDIO
Control
t
Delays
ROUTE
t
BLA
t
t
t
PTCLK
t
PTSR
t
BCLK
MCELL
BSR
t
EXP
t
GPTOE
t
PTOE
26
ispMACH 4000V/B/C/Z Family Data Sheet
Routing/GLB Delays
DATA
C.E.
S/R
t
t
PDb
MC Reg.
PDi
Q
Note: Italicized items are optional delay adders.
Register/Latch
Delays
t
ORP
Delays
In/Out
t
t
t
t
t
FBK
BUF
IOO
DIS
EN
Feedback
Out
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