PPC440GX-3RF800C Applied Micro Circuits Corporation, PPC440GX-3RF800C Datasheet - Page 66

• Manufacturer Part Number: PPC440GX-3RF800C
• Manufacturer: Applied Micro Circuits Corporation

Specifications of PPC440GX-3RF800C

• Family Name: 440GX
• Device Core: PowerPC
• Device Core Size: 32b
• Frequency (max): 800MHz
• Instruction Set Architecture: RISC
• Supply Voltage 1 (typ): 1.55/2.6V
• Operating Supply Voltage (max): 1.6/2.7V
• Operating Supply Voltage (min): 1.5/2.5V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 552
• Package Type: CBGA
• Lead Free Status / Rohs Status: Compliant

440GX – Power PC 440GX Embedded Processor
66
Spread Spectrum Clocking
Care must be taken when using a spread spectrum clock generator (SSCG) with the PPC440GX. This controller
uses a PLL for clock generation inside the chip. The accuracy with which the PLL follows the SSCG is referred to
as tracking skew. The PLL bandwidth and phase angle determine how much tracking skew there is between the
SSCG and the PLL for a given frequency deviation and modulation frequency. When using an SSCG with the
PPC440GX the following conditions must be met:
Notes:
Important: It is up to the system designer to ensure that any SSCG used with the PPC440GX meets the above
• The frequency deviation must not violate the minimum clock cycle time. Therefore, when operating the
• The maximum frequency deviation cannot exceed −3%, and the modulation frequency cannot exceed 40kHz.
• Use the Peripheral Bus Clock for logic that is synchronous to the peripheral bus since this clock tracks the
• Use the DDR SDRAM MemClkOut since it also tracks the modulation.
• For PCI-X and PCI 66 the maximum spread spectrum is -1% modulated between 30kHz and 33kHz.
PPC440GX with one or more internal clocks at their maximum supported frequency, the SSCG can only lower
the frequency.
In some cases, on-board PPC440GX peripherals impose more stringent requirements.
modulation.
1. The serial port baud rates are synchronous to the modulated clock. The serial port has a tolerance of
2. Ethernet operation is unaffected.
3. IIC operation is unaffected.
approximately 1.5% on baud rate before framing errors begin to occur. The 1.5% tolerance assumes that
the connected device is running at precise baud rates.
requirements and does not adversely affect other aspects of the system.
Revision 1.19 – December 19, 2008
Data Sheet
AMCC