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Table 5-1.
Signal Definitions (Sheet 2 of 4)
Name
DDR{0/1/2}_DQS_N[8]
DDR{0/1/2}_DQS_P[8]
DDR{0/1/2}_ECC[7:0]
DDR{0/1/2}_MA[15:0]
DDR{0/1/2}_ODT[3:0]
DDR{0/1/2}_RAS#
DDR{0/1/2}_RESET#
DDR{0/1/2}_WE#
ISENSE
PECI
PRDY#
PREQ#
PROCHOT#
PSI#
RESET#
SKTOCC#
TCK
TDI
TDO
TESTLOW
76
Type
I/O
Differential pair, ECC Check Bit Strobe. Differential strobes latch data/ECC for
each DRAM. Different numbers of strobes are used depending on whether the
connected DRAMs are x4,x8. Driven with edges in center of data, receive edges
are aligned with data edges.
I/O
Check Bits - An Error Correction Code is driven along with data on these lines for
DIMMs that support that capability.
O
Selects the Row address for Reads and writes, and the column address for
activates. Also used to set values for DRAM configuration registers.
O
Enables various combinations of termination resistance in the target and non-
target DIMMs when data is read or written
O
Row Address Strobe.
O
Resets DRAMs. Held low on power up, held high during self refresh, otherwise
controlled by configuration register.
O
Write Enable.
I
Current sense from VRD11.1.
I/O
PECI (Platform Environment Control Interface) is the serial sideband interface to
the processor and is used primarily for thermal, power and error management.
Details regarding the PECI electrical specifications, protocols and functions can
be found in the Platform Environment Control Interface Specification.
O
PRDY# is a processor output used by debug tools to determine processor debug
readiness.
I/O
PREQ# is used by debug tools to request debug operation of the processor.
I/O
PROCHOT# will go active when the processor temperature monitoring sensor
detects that the processor has reached its maximum safe operating
temperature. This indicates that the processor Thermal Control Circuit has been
activated, if enabled. This signal can also be driven to the processor to activate
the Thermal Control Circuit. This signal does not have on-die termination and
must be terminated on the system board.
O
Processor Power Status Indicator signal. This signal is asserted when maximum
possible processor core current consumption is less than 20A. Assertion of this
signal is an indication that the VR controller does not currently need to be able to
provide ICC above 20A, and the VR controller can use this information to move
to more efficient operation point. This signal will de-assert at least 3.3 us before
the current consumption will exceed 20A. The minimum PSI# assertion and de-
assertion time is 1 BCLK.
I
Asserting the RESET# signal resets the processor to a known state and
invalidates its internal caches without writing back any of their contents. Note
some PLL, QPI and error states are not effected by reset and only VCCPWRGOOD
forces them to a known state. For a power-on Reset, RESET# must stay active
for at least one millisecond after VCC and BCLK have reached their proper
specifications. RESET# must not be kept asserted for more than 10 ms while
VCCPWRGOOD is asserted. RESET# must be held deasserted for at least one
millisecond before it is asserted again. RESET# must be held asserted before
VCCPWRGOOD is asserted. This signal does not have on-die termination and
must be terminated on the system board. RESET# is a common clock signal.
O
SKTOCC# (Socket Occupied) will be pulled to ground on the processor package.
There is no connection to the processor silicon for this signal. System board
designers may use this signal to determine if the processor is present.
I
TCK (Test Clock) provides the clock input for the processor Test Bus (also known
as the Test Access Port).
I
TDI (Test Data In) transfers serial test data into the processor. TDI provides the
serial input needed for JTAG specification support.
O
TDO (Test Data Out) transfers serial test data out of the processor. TDO provides
the serial output needed for JTAG specification support.
I
TESTLOW must be connected to ground through a resistor for proper processor
operation.
Description
Intel® Xeon® Processor 3500 Series Datasheet, Volume 1
Signal Definitions
Notes
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