Hardware and Layout Design Considerations for DDR2 SDRAM Memory Interfaces -- Designer’s Checklist
on Aug 14, 2009 in High Speed Design PCB Layout DDR SDRAM Guidelines Memory Design Guidelines DDR2 Guidelines The design guidelines presented in this document apply to products that leverage the DDR2 SDRAM IP core, and they are based on a compilation of internal platforms.The purpose of these guidelines is to minimize board-related issues across multiple mem...

Ethernet Component Layout Guidelines
on Jul 26, 2009 in Routing PCB Components High Speed Design Gigabit Ethernet Guidelines High Frequency These sections provide recommendations for performing printed circuit board layouts. Good layout practices are essential to meet IEEE PHY conformance specifications and EMI regulatory requirements.Critical signal traces should be kept as short as pos...

Gigabit Ethernet Controller Design --> General Design Considerations for Ethernet Controllers
on Jul 11, 2009 in PCB Components High Speed Design PCB Layout High-Frequency Performance Gigabit Ethernet Guidelines Follow good engineering practices with respect to unused inputs by terminating them with pull-up or pull-down resistors, unless the datasheet, design guide or reference schematic indicates otherwise. Do not attach pull-up or pull-down resistors to a...

Gigabit Ethernet Controller Design Guidelines --> Ethernet Magnetic Selection Considerations
on Jul 11, 2009 in PCB Stack-up PCB Layout High-Frequency Performance Gigabit Ethernet Guidelines The Ethernet magnetic is dependent on the external PHY. Please refer to the external PHY’s datasheet and reference schematic for the detailed requirement of the Ethernet magnetic.The following is the reference Ethernet magnetic circuit (single RJ-4...

Gigabit Ethernet Controller Design Guidelines --> Power and Ground Planes Considerations
on Jul 11, 2009 in PCB Stack-up PCB Layout High-Frequency Performance Gigabit Ethernet Guidelines The RJ-45 chassis ground and the digital ground should be isolated through a 1M Ohm resistor and a 0.1uF decoupling capacitor. And the gap between the chassis ground and digital ground must be wider than 60 mils.All the digital and analog power plane...

Gigabit Ethernet Controller Design Consideration --> Ethernet Magnetic Layout Considerations
on Jul 11, 2009 in High Speed Design PCB Layout High-Frequency Performance Gigabit Ethernet Guidelines High Frequency The Ethernet magnetic layout considerations are dependent on the external PHY. Please refer to the preferred external PHY Ethernet magnetic layout guide for the detailed requirements.The following are some general Gigabit Ethernet layout consideratio...

General Routing Techniques with Emphasis on PI6C10X Clocks -- > Part 3
on Jun 24, 2009 in Clock Guidelines PCB Layout EMC Design Guidelines Copper Planes Clock traces can easily become antennas. 100 MHz clock running through a narrow trace can radiate EMI and affect the FM radio sitting next to the system. As is evident, 100MHz is right at the middle of the FM radio spectrum. The way to further decrea...

General Routing Techniques with Emphasis on PI6C10X Clocks -- > Part 2
on Jun 24, 2009 in Clock Guidelines Bypass PCB Layout Solutions to Routing ProblemsReducing RF CurrentsTo provide an efficient path for RF currents to ground place a localized ground plane under the clock generator. The inside PCB ground plane could be two or three levels away and may not be sufficient...

General Routing Techniques with Emphasis on PI6C10X Clocks -- > Part 1
on Jun 24, 2009 in Skew Routing Clock Guidelines PCB Layout Ground Bounce Advanced process technology provides market specifications for Skew, Jitter, and EMI. In addition, Pericom’s devices provide lower power consumption, smaller board space, lower operating temperature, and lower cost requirements.To avoid poor qualit...

Serial ATA: Designing for high-speed storage
on May 14, 2009 in Serial ATA PCB Layout Serial advanced technology attachment (SATA) is rapidly growing and poised to reign as the most popular hard-drive interface for PC, server and consumer electronics applications.With disk-based storage becoming increasingly important in all areas of...