GAL22V10 Lattice Semiconductor, GAL22V10 Datasheet - Page 14
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GAL22V10
Manufacturer Part Number
GAL22V10
Description
High Performance E2CMOS PLD Generic Array Logic
Manufacturer
Lattice Semiconductor
Datasheet
1.GAL22V10.pdf
(29 pages)
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fmax Descriptions
f
max with External Feedback 1/(
Note: fmax with external feedback is cal-
culated from measured tsu and tco.
Note: fmax with no feedback may be less
than 1/(twh + twl). This is to allow for a
clock duty cycle of other than 50%.
L O G I C
A R R A Y
f
LOGIC
ARRAY
max with No Feedback
t
su +
t
s u
t
h
R EG I S T E R
REGISTER
C L K
CLK
t
c o
t
su+
t
co)
14
Note: tcf is a calculated value, derived by sub-
tracting tsu from the period of fmax w/internal
feedback (tcf = 1/fmax - tsu). The value of tcf is
used primarily when calculating the delay from
clocking a register to a combinatorial output
(through registered feedback), as shown above.
For example, the timing from clock to a combi-
natorial output is equal to tcf + tpd.
Specifications GAL22V10
f
max with Internal Feedback 1/(
LOGIC
ARRAY
t
cf
t
pd
REGISTER
CLK
t
su+
t
cf)