Device Controller - HP 9000 Series 310 Service Information Manual

0 0
+4 +2
+3 +1
Figure 3-7. HP-HIL Cable Connector
Device Controller
A block diagram of a typical device controller is shown in Figure 3-8.
Regulator
+12V
GND
HP-HIL
-
H P-HIL
Data
Data
Regulator
I
+5 Volts
L
I
I
+12V
1
GND
HP-HIL Data
SI
so
RO Rl
HP-HIL Data
Device
Interface
Vt------I\
~
Device
Micro-
I
1\
processor
Device-Specific
~
Components
V
Figure 3-8. HP-HIL Device Controller
From the HP-HIL cable, +12 Vdc is regulated down to +5Vdc for use by device components.
The + 12 V dc input is also sent to components needing that supply.
Device Interface
The device interface serves as the comnlunication link between the device and system HP-HIL
microprocessor. In addition to transmitting and receiving data, it also interrupts the device
microprocessor when a correctly addressed data franle or improper format is received. It also
provides device hardware reset, lowers the NMI line at power-up and at device hard reset com-
mand.
Functional Description
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