PPC7A Product Manual
Functional Description
8-25
1
st
Edition
LED Register (Port 0x0820)
This register provides control for the 4 user LEDs fitted to the PPC7A.
MSB = D0, LSB = D7
D0: SCSI_TERM_REQ
0 = SCSI terminator not required (SCSI link not fitted)
1 = SCSI terminator required (SCSI link fitted)
D1: SCSI_TERM_EN
0 = Disable SCSI terminator
1 = Enable SCSI terminator
D2 and D3:
Selects the NVRAM page (each page is 8Kbytes)
D4: DS11,
yellow
0 = LED off, OFFLINE~ High
1 = LED on, OFFLINE~ Low
D5:
DS13 and DS1, Yellow
0 = LED on, SYSFAIL~ Low
1 = LED off, SYSFAIL~ High
D6:
DS12 and DS2, Red and S+YSFAIL~ (P0 B1) signal
0 = LED off
1 = LED on
D7:
DS14 and DS3, Green and SYSFAIL~ (P0 B2) signal
0 = LED off
1 = LED on
See the Software Programmable LEDs section and Chapter 6 for the location of these LEDs.
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Note:
DS12 and DS2 are on by default after power-up.
The on-board SCSI terminator can be enabled by the SCSI link (E13), or by setting SCSI_TERM_EN to 1.
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