Signal Descriptions
72
Datasheet, Volume 1
DDR{0/1/2}_DQS_N[7:0]
DDR{0/1/2}_DQS_P[7:0]
I/O
Differential pair, Data Strobe x8. Differential strobes latch
data/ECC for each DRAM. Different numbers of strobes are
used depending on whether the connected DRAMs are x4 or
x8. Driven with edges in center of data, receive edges are
aligned with data edges.
1
DDR{0/1/2}_MA[15:0]
O
Selects the Row address for reads and writes, and the column
address for activates. Also used to set values for DRAM
configuration registers.
1
DDR{0/1/2}_ODT[3:0]
O
Enables various combinations of termination resistance in the
target and non-target DIMMs when data is read or written
1
DDR{0/1/2}_RAS#
O
Row Address Strobe.
1
DDR{0/1/2}_RESET#
O
Resets DRAMs. Held low on power up, held high during self
refresh; otherwise, controlled by configuration register.
1
DDR{0/1/2}_WE#
O
Write Enable.
1
ISENSE
I
Current sense from VRD11.1.
PECI
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.
PRDY#
O
PRDY# is a processor output used by debug tools to determine
processor debug readiness.
PREQ#
I/O
PREQ# is used by debug tools to request debug operation of
the processor.
PROCHOT#
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.
PSI#
O
Processor Power Status Indicator signal. This signal is
asserted when maximum possible processor core current
consumption is less than 20 A. Assertion of this signal is an
indication that the VR controller does not currently need to be
able to provide I
CC
above 20 A, and the VR controller can use
this information to move to a more efficient operation point.
This signal will de-assert at least 3.3 us before the current
consumption will exceed 20 A. The minimum PSI#
assertion and de-assertion time is 1 BCLK.
RESET#
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 that 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 V
CC
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 de-asserted for at least 1 ms
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.
SKTOCC#
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.
TCK
I
TCK (Test Clock) provides the clock input for the processor
Test Bus (also known as the Test Access Port).
Table 5-1.
Signal Definitions (Sheet 2 of 4)
Name
Type
Description
Notes
Содержание BX80613I7980
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