SC2200UFH233F33 AMD (ADVANCED MICRO DEVICES), SC2200UFH233F33 Datasheet - Page 325

• Manufacturer Part Number: SC2200UFH233F33
• Manufacturer: AMD (ADVANCED MICRO DEVICES)

Specifications of SC2200UFH233F33

• Operating Temperature (min): 0C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Lead Free Status / Rohs Status: Compliant

Video Processor Module
7.2.7
The integrated (CRT) PLL can generate frequencies up to
135 MHz from a single 27 MHz source. The clock fre-
quency is programmable using two registers. Figure 7-15
shows the block diagram of the Video Processor integrated
PLL.
F
integrated oscillator. F
AMD Geode™ SC2200 Processor Data Book
REF
F
REF
F
is 27 MHz, generated by an external crystal and an
OUT
Integrated PLL
= (m + 1) / (n+ 1) x F
Divider
n
OUT
is calculated from:
REF
Compare
Phase
Figure 7-15. PLL Block Diagram
Divider
m
Charge
Pump
The integrated PLL can generate any frequency by writing
into the CRT-m and CRT-n bit fields (FBAR0+Memory Off-
set 2Ch). Additionally, 16 preprogrammed VGA frequencies
can be selected via the PLL Clock Select register
(F4BAR0+Memory Offset 2Ch[19:16]), if the crystal oscilla-
tor has a frequency of 27 MHz. This PLL can be powered
down via the Miscellaneous register (F4BAR0+Memory
Offset 28h[12]).
Loop
Filter
VCO
32580B
Divide
Out
F
OUT
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