Intel Phi 7120A SC7120A Data Sheet
Product codes
SC7120A
Document ID Number: 328209 003EN
Intel
®
Xeon Phi™ Coprocessor Datasheet
75
When the baseboard asserts PROCHOT (drives active low signal), the coprocessor OS
immediately drops the frequency to lowest rated value (Pn) within 100µs of asserting
PROCHOT. If PROCHOT is deasserted in less than 100ms, the coprocessor frequency is
restored to the original operational value (either P1 or turbo). if baseboard continues to
assert PROCHOT for more than 100ms, the coprocessor OS will respond by reducing
the voltage ID (VID) settings to match the lowest frequency, leading to further power
savings. Upon subsequent deassertion of PROCHOT, the VID settings are first restored
to support operational frequency, followed by the coprocessor frequency itself.
immediately drops the frequency to lowest rated value (Pn) within 100µs of asserting
PROCHOT. If PROCHOT is deasserted in less than 100ms, the coprocessor frequency is
restored to the original operational value (either P1 or turbo). if baseboard continues to
assert PROCHOT for more than 100ms, the coprocessor OS will respond by reducing
the voltage ID (VID) settings to match the lowest frequency, leading to further power
savings. Upon subsequent deassertion of PROCHOT, the VID settings are first restored
to support operational frequency, followed by the coprocessor frequency itself.
If a baseboard does not support the B12 capability the external throttle signal via pin
B12 can be disabled using this command. The card can still be throttled using the SMC
by sending the Assert Forced Throttle Command referenced above.
B12 can be disabled using this command. The card can still be throttled using the SMC
by sending the Assert Forced Throttle Command referenced above.
6.6.3.7.5
OEM Get Throttle Reason
The Get Throttle Reason command returns the state of the three throttle sources, PL1
(RAPL1), PL0 (RAPL2), and the external B12 pin.
(RAPL1), PL0 (RAPL2), and the external B12 pin.
6.6.3.8
Other IPMI Related Information
The SMC SEL is a circular log supporting a minimum of 64 log entries. It is resilient to
corruption, retaining information across an unexpected power loss.
corruption, retaining information across an unexpected power loss.
Table 6-21. Enable External Throttle Request Format
Byte
Value
Description
Command
0x06
• OEM Enable External Throttle
NetFn
0x3e
• NETFN_OEM
0
0x??
• 0 = Disable external throttle signal
• 1 = Enable external throttle signal
• All other values are reserved
• 1 = Enable external throttle signal
• All other values are reserved
Table 6-22. Enable External Throttle Response Format
Byte
Value
Description
0
0x??
• Compcode
• 0x00 - Normal
• 0xc0 - Busy
• 0x00 - Normal
• 0xc0 - Busy
Table 6-23.
OEM Get Throttle Reason Request Format
Byte
Value
Description
Command
0x07
• OEM Get Throttle Reason
NetFn
0x3e
• NETFN_OEM
Table 6-24.
OEM Get Throttle Reason Response Format
Byte
Value
Description
0
0x??
• Compcode
• 0x00 - Normal
• 0xc0 - Busy
• 0x00 - Normal
• 0xc0 - Busy
1
0x??
Bitmask of throttle reasons:
• 0: RAPL1 (PL1)
• 1: RAPL2 (PL0)
• 2: External (B12 pin)
• 1: RAPL2 (PL0)
• 2: External (B12 pin)