SN75LBC970A

SCSI DIFFERENTIAL CONVERTER-CONTROL

SLLS215B – MAY 1995 – REVISED JANUARY 1999

17

POST OFFICE BOX 655303

APPLICATION INFORMATION

400 ns of

BBSY = BSEL = 0?

Enable ABSY, AINIT,

BSEL, And BTARG

YES

RESEL_LATCH = 1?

NO

NO

NO

BSEL = 1?

YES

NO

YES

A

YES

Continued From Figure 8

DSEL_LATCH = 1?

YES

Enable BBSY, BINIT,

ASEL, And ATARG

ASEL = 1?

YES

NO

DSEL_LATCH = 1?

DRVBUS = 1

SDB = BI/O

Enable ABSY, ATARG,

BSEL, And BINIT

DRVBUS = 1

SDB = AI/O

Enable BBSY, BTARG,

ASEL, And AINIT

DSEL_LATCH = 1?

NO

RESEL_LATCH = 1?

RESEL_LATCH = 1?

YES

NO

DRVBUS = 1, SDB = BI/O

Enable ABSY, ATARG,

BSEL, And BINIT

DRVBUS = 1, SDB = AI/O

Enable BBSY, BTARG,

ASEL, And AINIT

YES

YES

Select 2

State

Transfer

State

NO

NO

(On Figure 8)

Select 1 State

Figure 9. SCSI Select 1, Select 2, and Transfer State Flow Chart