Specification Sheet

Datasheet, Volume 1 of 2 33

Signal Descriptions
EAR_N
External Alignment of Reset, used to bring the processor up into a
deterministic state. This signal is pulled up on the die, refer to Table 5-7,
“Signals with On-Die Weak PU/PD” for details.
FIVR_FAULT
Indicates an internal error has occurred with the integrated voltage
regulator. The FIVR_FAULT signal can be sampled any time after 1.5 ms
after the assertion of PWRGOOD. FIVR_FAULT must be qualified by
THERMTRIP_N assertion.
FRMAGENT
Bootable Firmware Agent Strap. This input configuration strap used in
combination with SOCKET_ID to determine whether the socket is a legacy
socket, bootable firmware agent is present, and DMI links are used in PCIe*
mode (instead of DMI3 mode).
The firmware flash ROM is located behind the local PCH attached to the
processor via the DMI3 interface.This signal is pulled down on the die, refer
to Table 5-7, “Signals with On-Die Weak PU/PD” for details.
PM_FAST_WAKE_N
Power Management Fast Wake. Enables quick package C3 - C6 exits of all
sockets. Asserted if any socket detects a break from package C3 - C6 state
requiring all sockets to exit the low power state to service a snoop, memory
access, or interrupt. Expected to be wired-OR among all processor sockets
within the platform.
PROC_ID [1:0]
This output can be used by the platform to determine if the installed
processor is an X-Series processor. There is no connection to the processor
silicon for this signal. The processor package grounds or floats the pin to set
‘0’ or ‘1’, respectively.
00: X-Series Processor
01: Future processor
10: Future processor
11: Future processor
RSVD
RESERVED. All signals that are RSVD must be left unconnected on the
board.
SAFE_MODE_BOOT
Safe Mode Boot Strap. SAFE_MODE_BOOT allows the processor to wake up
safely by disabling all clock gating. This allows BIOS to load registers or
patches if required. This signal is sampled after PWRGOOD assertion. The
signal is pulled down on the die. Refer to Table 5-7, “Signals with On-Die
Weak PU/PD” for details.
SKTOCC_N
SKTOCC_N (Socket Occupied) is used to indicate that a processor is present.
This is pulled to ground on the processor package; there is no connection to
the processor silicon for this signal.
SOCKET_ID[2:0]
SOCKET_IDStrap. Socket identification configuration straps for establishing
the PECI address. This signal is used in combination with FRMAGENT to
determine whether the socket is a legacy socket, bootable firmware agent is
present, and DMI links are used in PCIe* mode (instead of DMI3 mode).
Each processor socket consumes one Node ID, and there are 128 Home
Agent tracker entries. This signal is pulled down on the die. Refer to
Table 5-7, “Signals with On-Die Weak PU/PD” for details.
TEST[15:1]
TEST[14:13], TEST[2:1]] must be individually connected to an appropriate
power source or ground through a resistor for proper processor operation.
TXT_AGENT
Intel
®
Trusted Execution Technology (Intel
®
TXT) Agent Strap.
0 = Default. The socket is not the Intel
®
TXT Agent.
1 = The socket is the Intel
®
TXT Agent.
The legacy socket (identified by SOCKET_ID[1:0] = 00b) with Intel
®
TXT
Agent should always set the TXT_AGENT to 1b.
This signal is pulled down on the die. Refer to Table 5-7, “Signals with On-
Die Weak PU/PD” for details.
Table 4-11. Miscellaneous Signals (Sheet 2 of 3)
Signal Name Description