Clocking; Clock Generation - Sun Microsystems Sun Blade 100 Service Manual

C.4

Clocking

C.4.1

Clock Generation

There are four clock domains in Sun Blade 100. The domains are CPU, SDRAM, PCI,
and miscellaneous clocks.
All the clocks in those four domains are generated from clock synthesizers or
dedicated crystals on the motherboard except SDRAM clocks, which are generated
by the CPU.
TABLE C-1
generated by the clock generator or a dedicated crystal.
TABLE C-1
Component
CPU
CPU
CPU
CPU
SouthBridge
SouthBridge
SouthBridge
SouthBridge
Graphics Chip
Graphics chip
PCIO-2
PCIO-2
IChip2
PCI Bridge
AC97
1394 PHY
C-10 Sun Blade 100 Service Manual • October 2000
lists all the clocks present on the system. Each of the clocks listed is
Clock Frequencies
Clock Frequency (MHz)
CLKA 125 ~ 350
CLKB 125 ~ 350
PCI_REF_ 66.66
CLK
PCI_CLK 33.33
PCI_CLK 33.33
OSC32KI/ 32.768KHz
USB_CLK 48.00
OSC14M 14.3182
Clk 29.499
PCICLK 33.33
PCICLK 33.33
USBCLK 48.00
PCICLK 33.33
PCICLK 33.33
XIN 24.576
XIN 24.576
Source
Clock Generator LVPECL
Clock Generator LVPECL
Clock Generator Core PCI clock
Clock Generator PCI clock
Clock Generator PCI clock
Dedicated Crystal Real Time Clock
Clock Generator USB Clock
Clock Generator Reference clock
Dedicated Crystal Video clock
Clock Generator PCI Clock
Clock Generator PCI Clock
Clock Generator USB Clock
Clock Generator PCI clock
Clock Generator PCI clock
Dedicated Crystal CS4297 Clock
Dedicated Crystal FW802 Clock
Description