Service manual

2-6 AlphaServer 4000/4100 Service Manual
For the console to run, the path from the CPU to the XSROM must be functional.
The XSROM resides in FEPROM0 on the XBUS, off the EISA bus, off PCI 0, off
IOD 0. See Figure 2-4. This path is minimally tested by SROM.
Figure 2-4 Console Code Critical Path (4100 Block Diagram)
I2C Bus
Interface
Mouse/
Keyboard
Combo I/O:
serial ports
parallel port
floppy cntrl
Real-Time
Clock
Flash
ROM
2MB
NVRAM
8Kx8
BDATA
Xceivers
XBUS
Xceivers
XBUS
EISA
Bus
PKW0431E-96
PCI Bus 1
System Bus
Memory
Pair
CPU
PCI Slot
PCI Slot
PCI/EISA
Slot
PCI Bus 0
System to
PCI Bus
Bridge 1
System to
PCI Bus
Bridge 0
PCI Slot
PCI Slot
PCI Slot
EISA
Bridge
PCI/EISA
Slot
PCI/EISA
Slot
128-Bit Data Bus + 16 ECC and 40-Bit Command/Address Bus
64 Bits
64 Bits
Bridge Module
PCI Motherboard