Method and apparatus implementing a tuned stub SCSI topology
View Patent ↗In one aspect, the invention is a tuned stub, SCSI topology comprising a SCSI bus, a breakout node on the SCSI bus, an external SCSI connector on the SCSI bus at a first point defined by a first propagation delay; an internal SCSI connector on the SCSI bus at a second point defined by a second propagation delay, the first and second propagation delays being substantially equal; a SCSI adapter electrically tapping the breakout node; and a terminator electrically tapping the breakout node.
1. A tuned stub, SCSI topology, comprising:
a SCSI bus;
a breakout node on the SCSI bus;
an external SCSI connector on the SCSI bus at a first point defined by a first propagation delay;
an internal SCSI connector on the SCSI bus at a second point defined by a second propagation delay, the first and second propagation delays being substantially equal;
a SCSI adapter electrically tapping the breakout node; and
a terminator electrically tapping the breakout node.
2. The tuned stub, SCSI topology of claim 1 , wherein the topology implements an Ultra 2 or Ultra 3 SCSI specification.
3. The tuned stub, SCSI topology of claim 2 , wherein the first and second propagation delays are less than or equal to 525 ps from the breakout node.
4. The tuned stub, SCSI topology of claim 2 , wherein the first and second points are less than or equal to 3.5 inches from the breakout node.
5. The tuned stub, SCSI topology of claim 2 , wherein the SCSI adapter is located at a third distance less than or equal to 1.5 inches from the breakout node.
6. The tuned stub, SCSI topology of claim 2 , wherein the SCSI adapter is located at a third distance defined by a propagation delay less than or equal to 225 ps from the breakout node.
7. The tuned stub SCSI topology of claim 1 , wherein the terminator further comprises a plurality of termination packages.
8. The tuned stub SCSI topology of claim 1 , wherein the SCSI topology is implemented on a printed circuit board and the breakout node comprises a via in the printed circuit board.
9. A tuned stub, SCSI topology for use in a computing device, the SCSI topology comprising:
a SCSI bus;
a breakout node on the SCSI bus;
means for connecting the SCSI bus to an external computing device, the external connecting means being positioned on the SCSI bus at a first point defined by a first propagation delay;
means for connecting the SCSI bus to an internal component of the computing device, the internal connecting device being positioned on the SCSI bus at a second point defined by a second propagation delay, the first and second propagation delays being substantially equal;
a SCSI adapter electrically tapping the breakout node; and
a terminator electrically tapping the breakout node.
10. The tuned stub, SCSI topology of claim 9 , wherein the topology implements an Ultra 2 or Ultra 3 SCSI specification.
11. The tuned stub, SCSI topology of claim 10 , wherein the first and second propagation delays are less than or equal to 525 ps from the breakout node.
12. The tuned stub, SCSI topology of claim 10 , wherein the first and second points are less than or equal to 3.5 inches from the breakout node.
13. The tuned stub, SCSI topology of claim 10 , wherein the SCSI adapter is located at a third distance less than or equal to 1.5 inches from the breakout node.
14. The tuned stub, SCSI topology of claim 10 , wherein the SCSI adapter is located at a third distance defined by a propagation delay less than or equal to 225 ps from the breakout node.
15. The tuned stub SCSI topology of claim 9 , wherein the terminator further comprises a plurality of termination packages.
16. The tuned stub SCSI topology of claim 9 , wherein the SCSI topology is implemented on a printed circuit board and the breakout node comprises a via in the printed circuit board.
17. A method for implementing a tuned stub, SCSI topology including a SCSI adapter and a terminator electrically tapping a breakout node, the method comprising:
positioning an external SCSI connector on a SCSI bus at a first point defined by a first propagation delay from the breakout node; and
positioning an internal SCSI connector on the SCSI bus at a second point defined by a second propagation delay from the breakout node, the first and second propagation delays being substantially equal.
18. The method of claim 17 , wherein the topology implements an Ultra 2 or Ultra 3 SCSI specification.
19. The method of claim 18 , wherein the first and second propagation delays are less than or equal to 525 ps from the breakout node.
20. The method of claim 18 , wherein the first and second points are positioned less than or equal to 3.5 inches from the breakout node.
21. The method of claim 18 , further comprising locating the SCSI adapter at a third distance less than or equal to 1.5 inches from the breakout node.
22. The method of claim 18 , further comprising locating the SCSI adapter at a third distance defined by a propagation delay less than or equal to 225 ps from the breakout node.
23. The method of claim 17 , wherein the terminator further comprises a plurality of termination packages.
24. The method of claim 17 , further comprising implementing the SCSI topology on a printed circuit board and wherein the breakout node comprises a via in the printed circuit board.
25. A computing system, comprising:
a first computing device; and
a second computing device, the second computing device including:
a plurality of internal components; and
a tuned stub, SCSI topology, the topology comprising:
a SCSI bus;
a breakout node on the SCSI bus;
an external SCSI connector on the SCSI bus by which the first computing device is connected to the second computing device at a first point defined by a first propagation delay;
an internal SCSI connector on the SCSI bus by which the SCSI bus is connected to the internal components at a second point defined by a second propagation delay, the first and second propagation delays being substantially equal;
a SCSI adapter electrically tapping the breakout node; and
a terminator electrically tapping the breakout node.
26. The computing system of claim 25 , wherein the topology implements an Ultra 2 or Ultra 3 SCSI specification.
27. The computing system of claim 26 , wherein the first and second propagation delays are less than or equal to 525 ps from the breakout node.
28. The computing system of claim 26 , wherein the first and second points are less than or equal to 3.5 inches from the breakout node.
29. The computing system of claim 26 , wherein the SCSI adapter is located at a third distance less than or equal to 1.5 inches from the breakout node.
30. The computing system of claim 26 , wherein the SCSI adapter is located at a third distance defined by a propagation delay less than or equal to 225 ps from the breakout node.
31. The computing system of claim 25 , wherein the terminator further comprises a plurality of termination packages.
32. The computing system of claim 25 , wherein the SCSI topology is implemented on a printed circuit board and the breakout node comprises a via in the printed circuit board.
33. A computing system, comprising:
a first computing device; and
a second computing device, the second computing device including:
a plurality of internal components; and
a tuned stub, SCSI topology, the topology comprising:
a SCSI bus;
a breakout node on the SCSI bus;
means for connecting the SCSI bus to the first computing device, the external connecting means being positioned on the SCSI bus at a first point defined by a first propagation delay;
means for connecting the SCSI bus to the internal components of the computing device, the internal connecting device being positioned on the SCSI bus at a second point defined by a second propagation delay, the first and second propagation delays being substantially equal;
a SCSI adapter electrically tapping the breakout node; and
a terminator electrically tapping the breakout node.
34. The computing system of claim 33 , wherein the topology implements an Ultra 2 or Ultra 3 SCSI specification.
35. The computing system of claim 34 , wherein the first and second propagation delays are less than or equal to 525 ps from the breakout node.
36. The computing system of claim 34 , wherein the first and second points are less than or equal to 3.5 inches from the breakout node.
37. The computing system of claim 34 , wherein the SCSI adapter is located at a third distance less than or equal to 1.5 inches from the breakout node.
38. The computing system of claim 34 , wherein the SCSI adapter is located at a third distance defined by a propagation delay less than or equal to 225 ps from the breakout node.
39. The computing system of claim 33 , wherein the terminator further comprises a plurality of termination packages.
40. The computing system of claim 33 , wherein the SCSI topology is implemented on a printed circuit board and the breakout node comprises a via in the printed circuit board.
41. A computing device, comprising:
a plurality of internal components; and
tuned stub, SCSI topology, including:
a SCSI bus;
a breakout node on the SCSI bus;
an external SCSI connector on the SCSI bus at a first point defined by a first propagation delay;
an internal SCSI connector on the SCSI bus by which the topology is connected to the internal components at a second point defined by a second propagation delay, the first and second propagation delays being substantially equal;
a SCSI adapter electrically tapping the breakout node; and
a terminator electrically tapping the breakout node.
42. The computing device of claim 41 , wherein the topology implements an Ultra 2 or Ultra 3 SCSI specification.
43. The computing device of claim 42 , wherein the first and second propagation delays are less than or equal to 525 ps from the breakout node.
44. The computing device of claim 42 , wherein the first and second points are less than or equal to 3.5 inches from the breakout node.
45. The computing device of claim 42 , wherein the SCSI adapter is located at a third distance less than or equal to 1.5 inches from the breakout node.
46. The computing device of claim 42 , wherein the SCSI adapter is located at a third distance defined by a propagation delay less than or equal to 225 ps from the breakout node.
47. The computing device of claim 41 , wherein the terminator further comprises a plurality of termination packages.
48. The computing device of claim 41 , wherein the SCSI topology is implemented on a printed circuit board and the breakout node comprises a via in the printed circuit board.
49. A computing device, comprising:
a plurality of internal components; and
a tuned stub, SCSI topology, including:
a SCSI bus;
a breakout node on the SCSI bus;
means for connecting the SCSI bus to an external computing device, the external connecting means being positioned on the SCSI bus at a first point defined by a first propagation delay;
means for connecting the SCSI bus to the internal components of the computing device, the internal connecting device being positioned on the SCSI bus at a second point defined by a second propagation delay, the first and second propagation delays being substantially equal;
a SCSI adapter electrically tapping the breakout node; and
a terminator electrically tapping the breakout node.
50. The computing device of claim 49 , wherein the topology implements an Ultra 2 or Ultra 3 SCSI specification.
51. The computing device of claim 50 , wherein the first and second propagation delays are less than or equal to 525 ps from the breakout node.
52. The computing device of claim 50 , wherein the first and second points are less than or equal to 3.5 inches from the breakout node.
53. The computing device of claim 50 , wherein the SCSI adapter is located at a third distance less than or equal to 1.5 inches from the breakout node.
54. The computing device of claim 50 , wherein the SCSI adapter is located at a third distance defined by a propagation delay less than or equal to 225 ps from the breakout node.
55. The computing device of claim 49 , wherein the terminator further comprises a plurality of termination packages.
56. The computing device of claim 49 , wherein the SCSI topology is implemented on a printed circuit board and the breakout node comprises a via in the printed circuit board.
57. A a tuned stub, SCSI topology including a SCSI adapter and a terminator electrically tapping a breakout node, the method comprising:
means for positioning an external SCSI connector on a SCSI bus at a first point defined by a first propagation delay from the breakout node; and
means for positioning an internal SCSI connector on the SCSI bus at a second point defined by a second propagation delay from the breakout node, the first and second propagation delays being substantially equal.
58. The tuned stub, SCSI topology of claim 57 , wherein the topology implements an Ultra 2 or Ultra 3 SCSI specification.
59. The tuned stub, SCSI topology of claim 58 , wherein the first and second propagation delays are less than or equal to 525 ps from the breakout node.
60. The tuned stub, SCSI topology of claim 58 , wherein the first and second points are positioned less than or equal to 3.5 inches from the breakout node.
61. The tuned stub, SCSI topology of claim 58 , further comprising means for locating the SCSI adapter at a third distance less than or equal to 1.5 inches from the breakout node.
62. The tuned stub, SCSI topology of claim 58 , further comprising means for locating the SCSI adapter at a third distance defined by a propagation delay less than or equal to 225 ps from the breakout node.
63. The tuned stub, SCSI topology of claim 57 , wherein the terminator further comprises a plurality of termination packages.
64. The tuned stub, SCSI topology of claim 57 , further comprising implementing the SCSI topology on a printed circuit board and wherein the breakout node comprises a via in the printed circuit board.