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本帖最后由 yuzengshu 于 2009-11-5 13:19 编辑 . H2 }5 W _( ~$ w
# p/ y( o) ]3 }
CPCI 分为系统板，背板，外围板，对于外围板有死规范，但是对于，系统板，和背板的规范) y. S3 E1 _% @ v! M8 `
，见的不多，就是对于系统板，时钟线和数据线的长度有没有限定，还有背板，时钟和数据长度的限定怎么 {8 R# [! s- {- u; p M' {, X
计算，希望做过的朋友，给点经验，我的是PCI TO PCI桥出来，在到CPCI接口的，谢谢
3 H& j- O: f% M大家看看这段怎么理解7 k3 f: a N" @1 g' t X2 V# x( W7 _8 Q
1 The System Slot clock distribution circuitry shall be designed to accommodate/ J" t$ ?/ }6 \$ T1 M% {% f
up to 200 ps of backplane and peripheral board skew. The following design rules2 o. `0 n J! ]* H5 H
apply to clock distribution to backplane peripherals and local (onboard) PCI( E1 @6 ~" A7 n. u
peripherals4 \& ? p0 C" y0 f$ _. D6 o
2 Any onboard PCI peripherals connected to the CompactPCI bus, including, Y- x$ {. O, }" g5 L
PCI to PCI bridges, shall be provided a clock that is delayed to: v% b; I3 k i8 l& K$ u J
accommodate the maximum propagation delay of the backplane clocks and
2 s( M/ O. @5 n( Gstill meet the 1 ns overall skew requirement. Up to 800 ps of skew is3 P" G9 q3 D) X0 @7 [% Q: @3 @! c
allowed for onboard clock distribution (including the clock buffer internal4 q0 i4 Q% x1 }, J* ~
skew). The onboard clock signals shall be delayed beyond the clocks routed
% ]8 r) H/ m: W! p. l0 |7 Xto the backplane (Section 3.5.5.1) to accommodate best and worst case
% C! l' \! ]- }: d$ q" P' p0 _) Cbackplane delays and the 63.5mm wire delay on the peripheral board. |
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发表于 2009-11-5 13:17
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淘帖
支持！
反对！