Datasheet, Volume 1
71
Signal Descriptions
5
Signal Descriptions
This chapter provides the processor signal definitions.
Table 5-1.
Signal Definitions (Sheet 1 of 4)
Name
Type
Description
Notes
BCLK_DN
BCLK_DP
I
Differential bus clock input to the processor.
BCLK_ITP_DN
BCLK_ITP_DP
O
Buffered differential bus clock pair to ITP.
BPM#[7:0]
I/O
BPM#[7:0] are breakpoint and performance monitor signals.
They are outputs from the processor that indicate the status
of breakpoints and programmable counters used for
monitoring processor performance.
CAT_ERR#
I/O
Indicates that the system has experienced a catastrophic error
and cannot continue to operate. The processor will set this for
non-recoverable machine check errors and other internal
unrecoverable error. Since this is an I/O pin, external agents
are allowed to assert this pin which will cause the processor to
take a machine check exception.
COMP0
I
Impedance compensation must be terminated on the system
board using a precision resistor.
QPI_CLKRX_DN
QPI_CLKRX_DP
I
I
Intel QPI received clock is the input clock that corresponds to
the received data.
QPI_CLKTX_DN
QPI_CLKTX_DP
O
O
Intel QPI forwarded clock sent with the outbound data.
QPI_CMP[0]
I
Must be terminated on the system board using a precision
resistor.
QPI_DRX_DN[19:0]
QPI_DRX_DP[19:0]
I
I
QPI_DRX_DN[19:0] and QPI_DRX_DP[19:0] comprise the
differential receive data for the QPI port. The inbound 20 lanes
are connected to another component’s outbound direction.
QPI_DTX_DN[19:0]
QPI_DTX_DP[19:0]
O
O
QPI_DTX_DN[19:0] and QPIQPI_DTX_DP[19:0] comprise the
differential transmit data for the QPI port. The outbound 20
lanes are connected to another component’s inbound
direction.
DBR#
I
DBR# is used only in systems where no debug port is
implemented on the system board. DBR# is used by a debug
port interposer so that an in-target probe can drive system
reset. If a debug port is implemented in the system, DBR# is
a no connect in the system. DBR# is not a processor signal.
DDR_COMP[2:0]
I
Must be terminated on the system board using precision
resistors.
DDR_VREF
I
Voltage reference for DDR3
DDR{0/1/2}_BA[2:0]
O
Defines the bank which is the destination for the current
Activate, Read, Write, or Precharge command.
1
DDR{0/1/2}_CAS#
O
Column Address Strobe.
1
DDR{0/1/2}_CKE[3:0]
O
Clock Enable.
1
DDR{0/1/2}_CLK_N[2:0]
DDR{0/1/2}_CLK_P[2:0]
O
Differential clocks to the DIMM. All command and control
signals are valid on the rising edge of clock.
1
DDR{0/1/2}_CS[1:0]#
DDR{0/1/2}_CS[5:4]#
O
Each signal selects one rank as the target of the command
and address.
1
DDR{0/1/2}_DQ[63:0]
I/O
DDR3 Data bits.
1
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