ADLINK Technology cPCI-8210 Manual de usuario descargar pdf (Pagina 10)

2 • Introduction

the higher rate, as well as much longer SCSI cable tolerance up to 12

meters. The 53C895 is backward compatible with all the SCSI standards. It

could automatically detect the devices connected to the subsystem. If the

devices are also Wide Ultra-2 SCSI compliant, the 53C895 runs in the

highest mode that the LVD link is enabled, otherwise the 53C895 will fall

back to the older mode automatically.

About SCSI (Small Computer System Interface)

The follow standard is defined by ANSI.

Max. Bus Lengths,

Meters

(1)

SCSI Item

Bus Speed,

MBytes/Sec. Max.

Bus

Width,

bits

Single-

ended

LVD

HVD

Max. Device

Support

SCSC-1

(2)

5 8 6

(3)

25 8

Fast SCSI

(2)

10 8 3

(3)

25 8

Fast Wide SCSI 20 16 3

(3)

25 16

Ultra SCSI

(2)

20 8 1.5

(3)

25 8

Ultra SCSI

(2)

20 8 3 - - 4

Wide Ultra SCSI 40 16 -

(3)

25 16

Wide Ultra SCSI 40 16 1.5 - - 8

Wide Ultra SCSI 40 16 3 - - 4

Ultra2 SCSI

(2,4)

40 8

(4)

12 25 8

WideUltra2SCSI

(4)

80 16

(4)

12 25 16

Note:

(1) The listed maximum bus lengths may be exceeded in Point-to-

Point and engineered applications.

(2) Use of the word "Narrow", preceding SCSI, Ultra SCSI, or Ultra2

SCSI is optional.

(3) LVD was not defined in the original SCSI standards for this speed.

If all devices on the bus support LVD, then 12-meters operation is

possible at this speed. However, if any device on the bus is

singled-ended only, then the entire bus switches to single-ended

mode and the distances in the single-ended column apply.

(4) Single-ended is not defined for speeds beyond Ultra.

(5) HVD (Differential) is not defined for speeds beyond Ultra2.

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