Renesas IDT Tsi574, User Manual

Page: 72 / 514

3. Serial RapidIO Electrical Interface > Port Power Down 72
Tsi574 User Manual
June 6, 2016
Integrated Device Technology
www.idt.com
• “Internal Switching Fabric (ISF) Registers”
• “I2C Registers” on page 403
• “Utility Unit Registers” on page 377
3.5.1 Default Configurations on Power Down
When a port is powered down, the port loses configuration information that is stored for that specific
port. For example, multicast settings and port write settings return to their default reset settings after a
port reset (port is powered down and back up). After port reset, there is no way to determine that the
configuration for a particular port is correct. The registers listed in
“Global Registers to Program after
Port Power Down” are imaged in every port but are accessed through one register address. Therefore,
the powering down of a port removes the image of that register in that port.
For example, if a port is shut down and then restored, the port write destinationID in that port is reset to
the default value. The port write destinationID must be re-written for the whole device after a port is
shut down and restored. Similarly, multicast settings for the entire device must be re-written when a
port is shut down and restored.
3.5.1.1 Global Registers to Program after Port Power Down
The following global registers must be re-programmed with the appropriate configuration values when
a port is reset:
• “RapidIO Component Tag CSR”
• “RapidIO Route LUT Attributes (Default Port) CSR”
• “RapidIO Switch Port Link Timeout Control CSR”
• “RapidIO Switch Port General Control CSR”
• “RapidIO Logical and Transport Layer Error Enable CSR”
• “RapidIO Port-Write Target Device ID CSR”
• “RapidIO Multicast Write ID x Register”
3.5.2 Special Conditions for Port 0 Power Down
Port 0 can only be powered down through register accesses and not through the SPn_PWRDN pin. Port
0 has the has following special conditions after it is powered down:
• The list of registers in “Default Configurations on Power Down” on page 72 can not be read while
port 0 is in reset
• After reset the listed registers must be re-written (like any other port that has been powered down)