HP Model 745 HP Model 745 Service Handbook - Page 161

Model 744 Block Diagram, shows the Model 744 block diagram.

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Diagrams Functional Description of Model 745 Chassis Figure 6-2 shows the Model 744 block diagram. Backplane P1 Connector Power Backplane Bus Reserved Connector EEPROM REGs Backplane Controller ASIC Firmware Controller GSC Connector Second Level Cache (165 MHz only) CPU Backplane P2 Connector GSC Bus Slot 2 Power RAM Card 64-256 MB RAM Card 64-256 MB RAM Card 64-256 MB RAM Stack RAM Bus RAM Card 64-256 MB PDC & IODC SRAM I/O Controller ASIC RTC RTC Battery Graphics Controller ASIC Display RAM Sysfail LED RS-232 B Reset/ Abort Switch RS-232 A Audio Parallel AUI LAN Boot/ Run LED Speaker PS/2-1 Video PS/2-0 SE SCSI Figure 6-2 Model 744 Block Diagram 6-3

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Diagrams
Functional Description of Model 745 Chassis
6-3
Figure 6-2 shows the Model 744 block diagram.
Figure 6-2
Model 744 Block Diagram
RTC
CPU
Backplane
Controller
ASIC
I/O
Controller
ASIC
Graphics
Controller
ASIC
Backplane P1 Connector
Backplane P2 Connector
GSC
Connector
Reserved Connector
RAM Stack
Display
RAM
Backplane Bus
GSC Bus
Power
Power
RTC
Battery
RAM Bus
Video
RS–232 B
RS–232 A
Audio
Speaker
Sysfail
LED
Boot/
Run
LED
Parallel
SE SCSI
AUI
LAN
PS/2–0
PS/2–1
Reset/
Abort
Switch
RAM
Card
64–256 MB
Slot 2
RAM
Card
64–256 MB
RAM
Card
64–256 MB
RAM
Card
64–256 MB
Firmware
Controller
EEPROM
REGs
PDC & IODC
SRAM
Cache
(165 MHz only)
Second Level