规格
isplsi 8840
17
例子 定时 calculations
t
pd1 = (bfm 输入 path 延迟) + (glb 延迟) + (output path delay)
= (
t
idcom +
t
ibp +
t
bfmi) + (
t
andhs +
t
4ptcom +
t
mbp) + (
t
bfmm +
t
bcom +
t
obp +
t
odcom +
t
slf)
= (#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
t
pd (在里面 bfm)
= (bfm 延迟) + (glb 延迟)
= (
t
bfmm) + (
t
andhs +
t
4ptcom +
t
mbp)
= (#64) + (#39 + #42 + #45)
= (1.9) + (3.6 + 0.2 + 0.0)
= 5.7 ns
t
pd (在 bfms)
= (grp 延迟) + (bfm 延迟) + (glb delay)
= (
t
grpm) + (
t
bfmg) + (
t
andhs +
t
4ptcom +
t
mbp)
= (#65) + (#67) + (#39 + #42 + #45)
= (2.0) + (1.6) + (3.6 + 0.2 + 0.0)
= 7.4 ns
bfm i/o 至 内部的 触发-状态 使能/使不能运转
= (bfm 输入 path 延迟) + (glb 延迟, 1pt) + (tri-state 控制 delay)
= (
t
idcom +
t
ibp +
t
bfmi) + (
t
andhs +
t
1pt +
t
mbp) + (
t
grpmz)
= (#23 + #26 + #61) + (#39 + #41 + #45) + (#66)
= (0.1 + 0.2 + 0.2) + (3.6 + 3.6 + 0.0) + (4.0)
= 11.7 ns
t
su1 = (bfm 输入 path 延迟) + (glb 建制 时间) - (min. global 时钟 delay)
= (
t
idcom +
t
ibp +
t
bfmi) + (
t
andhs +
t
4ptreg +
t
msu)
–
(
t
gck 最小值)
= (#23 + #26 + #61) + (#39 + #43 + #48)
–
(#78)
= (0.1 + 0.2 + 0.2) + (3.6 + 3.4 + 0.4)
–
(2.9)
= 5 ns
1/
F
最大值 = (global clk 至 mc 输出) + (local 反馈) + (glb 建制 time)
= (
t
mco) + (
t
floc) + (
t
andhs +
t
ptsa +
t
msu)
= (#47) + (#54) + (#39 + #44 + #48)
= (0.2) + (1.1) + (3.6 + 3.7 + 0.4)
= 9 ns
F
最大值 = 111 mhz
便条: calculations 是 为基础 在之上 定时 规格 为 这 isplsi 8840-110l
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