DATASHEET
PM5349 S/UNI-QUAD
ISSUE 6 | SATURN USER NETWORK INTERFACE | |
|
|
|
device inputs and outputs can be sampled by loading the boundary scan register using the
IDCODE
The identification instruction is used to connect the identification register between TDI and TDO. The device's identification code can then be shifted out using the
STCTEST
The single transport chain instruction is used to test out the TAP controller and the boundary scan register during production test. When this instruction is the current instruction, the boundary scan register is connected between TDI and TDO. During the
13.7 Board Design Recommendations
The noise environment and signal integrity are often the limiting factors in system performance. Therefore, the following board design guidelines must be followed in order to ensure proper operation:
1.Use a single plane for both digital and analog grounds.
2.Provide separate +3.3 volt analog transmit, +3.3 volt analog receive, and +3.3 volt digital supplies, but otherwise connect the supply voltages together at one point close to the connector where +3.3 volts is brought to the card.
3.Ferrite beads are not advisable in digital switching circuits because inductive spiking (di/dt noise) is introduced into the power rail. Simple RC filtering is probably the best approach provided care is taken to ensure the IR drop in the resistance does not lower the supply voltage below the recommended operating voltage.
4.Separate
Proprietary and Confidential to | 217 |