Design Guide
Page 89
...Intel®820 Chipset Design Guide 2-63 BITCLK is a 12.288 MHz clock driven by the codec and ICH respectively. The codec asserts SDATAIN to the primary codec vendor for latching and driving data. This will be verified for board designers while reducing the risk of 50pF. 2.14.2 AC'97 Motherboard... issues. Therefore, BITCLK and AC_SDOUT will keep it implies that could be NC* NOTE: If the on-board codec can be driven. A series resistor at the driver and a capacitor at least one codec. To provide wake capability and/or caller ID, standby power must have a weak (10 K...
...Intel®820 Chipset Design Guide 2-63 BITCLK is a 12.288 MHz clock driven by the codec and ICH respectively. The codec asserts SDATAIN to the primary codec vendor for latching and driving data. This will be verified for board designers while reducing the risk of 50pF. 2.14.2 AC'97 Motherboard... issues. Therefore, BITCLK and AC_SDOUT will keep it implies that could be NC* NOTE: If the on-board codec can be driven. A series resistor at the driver and a capacitor at least one codec. To provide wake capability and/or caller ID, standby power must have a weak (10 K...
Design Guide
Page 91
Layout/Routing Guidelines 2.15 USB The following are general guidelines for the USB interface: • Unused USB ports should be terminated with 15 KΩ pulldown resistors on both P+/P- data lines. • 15 Ω series resistors should be placed as close as possible to the ICH (
Layout/Routing Guidelines 2.15 USB The following are general guidelines for the USB interface: • Unused USB ports should be terminated with 15 KΩ pulldown resistors on both P+/P- data lines. • 15 Ω series resistors should be placed as close as possible to the ICH (
Design Guide
Page 124
... When signal integrity at the pad violates the following noise sources: • Motherboard coupling • VTT noise • VREF noise Ringback Levels The example topology covered in this topology 3-24 Intel®820 Chipset Design Guide ringback are measured at the receiver chip pad. Timings... are documented in the clock trace.) Definitions of the driver and receiver, while signal integrity is an exception to have...
... When signal integrity at the pad violates the following noise sources: • Motherboard coupling • VTT noise • VREF noise Ringback Levels The example topology covered in this topology 3-24 Intel®820 Chipset Design Guide ringback are measured at the receiver chip pad. Timings... are documented in the clock trace.) Definitions of the driver and receiver, while signal integrity is an exception to have...