Sun Microsystems SunSwift SPARCserver 1000, Manual, Page: 18 / 76

1-4 SPARCserver 1000 System Board Manual—October 1994
1
1.4 System Board Block Diagram
Figure 1-2 is a block diagram of the system board. The SuperSPARC modules,
SIMMs, and optional SBus cards are removable and can be replaced or moved
to another SPARCserver 1000 system board.
Figure 1-2 System Board Block Diagram
The components shown in solid outlines cannot be replaced in the field; if the
diagnostic self-tests report that a non-removable component failed, the entire
system board must be replaced.
DRAM
group
I/O
Cache
(IOC)
Memory
control
(MQH)
SBus
Intf.
(SBI)
Bus
watcher
(BW)
BIC
and
BARB
Data
Addr
SBus
SPARC module SPARC module
LEDS JTAG Control
SRAM
UARTs EPROM
BBC2
BootBus
CPU
Cache
control
XBus
XBus
CPU
High
speed
cache
plus
parity
Cache
control
High
speed
cache
plus
parity
TODC/NVRAM
Bus
watcher
(BW)
DRAM
group
Slot 3
On-board
ethernet
and SCSI
Slot 2
Slot 1
Page
table
Data
Addr
XBus