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本帖最后由 yuzengshu 于 2009-11-5 13:19 编辑 * A# t+ d$ a# L0 L+ W
: ?1 k' A( O/ D* i: Q6 D( nCPCI 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3 x* J: P* j( I3 V/ a3 O
，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) t8 _: j7 V" \- C+ B
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' u' g: Q. ~/ G5 ^. f, S4 s( X
大家看看这段怎么理解3 F) Y" b# N) }0 o/ s6 I. U
1 The System Slot clock distribution circuitry shall be designed to accommodate9 k5 Y& ~: [5 I' K1 t8 O0 p, w( B8 C
up to 200 ps of backplane and peripheral board skew. The following design rules
# i7 W5 |; ^% T9 \' Eapply to clock distribution to backplane peripherals and local (onboard) PCI* S/ ^% H+ a/ i$ t. R" P
peripherals5 [2 l0 J3 n) }" F' v; R
2 Any onboard PCI peripherals connected to the CompactPCI bus, including' ~# t6 k, c% [0 V% r. l
PCI to PCI bridges, shall be provided a clock that is delayed to
* u/ L3 e6 Q2 h, u+ |9 Y" yaccommodate the maximum propagation delay of the backplane clocks and: ]( w" p' b. U5 m
still meet the 1 ns overall skew requirement. Up to 800 ps of skew is
) }' @1 U- P2 B$ Z7 E3 ballowed for onboard clock distribution (including the clock buffer internal) Z0 I% @* L$ ^
skew). The onboard clock signals shall be delayed beyond the clocks routed
6 L" {& A' g7 E1 ?/ {! m. f4 _* Fto the backplane (Section 3.5.5.1) to accommodate best and worst case
8 ]2 [4 {5 {+ W6 Pbackplane 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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反对！