CHAPTER 6: SCSI Technical Information

DB0 through DB15, P, P1 (DATA BUS): Sixteen data-bit signals and two parity- bit signals that together form a data bus. DB15 is the most significant bit and has the highest priority during the Arbitration phase. Bit number, significance, and priority decrease downward to DB0. A data bit is defined as a one when the signal value is true and as a zero when the signal value is false. Data parity DBP and DBP1 shall be odd.

Table 6-1. SCSI connector assignments for

single-ended (SE) 16-bit SCSI (wide).

Signal Name

Pin Number

Signal Name

Pin Number

 

 

 

 

Ground

1

-DB12

35

 

 

 

 

Ground

2

-DB13

36

 

 

 

 

Ground

3

-DB14

37

 

 

 

 

Ground

4

-DB15

38

 

 

 

 

Ground

5

-DBP1

39

 

 

 

 

Ground

6

-DB0

40

 

 

 

 

Ground

7

-DB1

41

 

 

 

 

Ground

8

-DB2

42

 

 

 

 

Ground

9

-DB3

43

 

 

 

 

Ground

10

-DB4

44

 

 

 

 

Ground

11

-DB5

45

 

 

 

 

Ground

12

-DB6

46

 

 

 

 

Ground

13

-DB7

47

 

 

 

 

Ground

14

-DBP

48

 

 

 

 

 

 

 

 

41

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Image 42
Black Box SC121A, SC120A-R2 manual Signal Name

SC121A, SC120A-R2 specifications

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