ISPLSI8840-60LB432 LATTICE [Lattice Semiconductor], ISPLSI8840-60LB432 Datasheet - Page 17

• Manufacturer Part Number: ISPLSI8840-60LB432
• Manufacturer: LATTICE [Lattice Semiconductor]

Example Timing Calculations
t
t
t
BFM I/O to internal tri-state Enable/Disable
t
1/
F
Note: Calculations are based upon timing specifications for the ispLSI 8840-110L
pd1
pd (within BFM)
pd (between BFMs)
su1
max
F
max = (Global Clk to MC Output) + (Local Feedback) + (GLB Setup Time)
= (BFM Input Path Delay) + (GLB Delay) + (Output Path Delay)
= (
= (#23 + #26 + #61) + (#39 + #42 + #45) + (#64 + #69 + #25 + #35 + #37)
= (0.1 + 0.2 + 0.2) + (3.6 + 0.2 + 0.0) + (1.9 + 0.5 + 0.0 + 1.7 + 0.0)
= 8.4 ns
= (BFM Delay) + (GLB Delay)
= (
= (#64) + (#39 + #42 + #45)
= (1.9) + (3.6 + 0.2 + 0.0)
= 5.7 ns
= (GRP Delay) + (BFM Delay) + (GLB Delay)
= (
= (#65) + (#67) + (#39 + #42 + #45)
= (2.0) + (1.6) + (3.6 + 0.2 + 0.0)
= 7.4 ns
= (BFM Input Path Delay) + (GLB Delay, 1PT) + (Tri-state Control Delay)
= (
= (#23 + #26 + #61) + (#39 + #41 + #45) + (#66)
= (0.1 + 0.2 + 0.2) + (3.6 + 3.6 + 0.0) + (4.0)
= 11.7 ns
= (BFM Input Path Delay) + (GLB Setup Time) - (Min. Global Clock Delay)
= (
= (#23 + #26 + #61) + (#39 + #43 + #48) – (#78)
= (0.1 + 0.2 + 0.2) + (3.6 + 3.4 + 0.4) – (2.9)
= 5 ns
= (
= (#47) + (#54) + (#39 + #44 + #48)
= (0.2) + (1.1) + (3.6 + 3.7 + 0.4)
= 9 ns
= 111 MHz
t
t
t
t
t
t
idcom +
bfmm) + (
grpm) + (
idcom +
idcom +
mco) + (
t
t
t
t
t
floc) + (
ibp +
ibp +
ibp +
t
bfmg) + (
andhs +
t
t
t
bfmi) + (
bfmi) + (
bfmi) + (
t
andhs +
t
t
4ptcom +
andhs +
t
t
t
andhs +
andhs +
andhs +
t
ptsa +
t
4ptcom +
t
mbp)
t
t
t
t
4ptcom +
1pt +
4ptreg +
msu)
t
t
mbp)
mbp) + (
t
msu) – (
t
mbp) + (
17
t
grpmz)
t
gck min)
t
bfmm +
Specifications ispLSI 8840
t
bcom +
t
obp +
t
odcom +
t
slf)