Electrical Specifications
32
Datasheet, Volume 1
2.12
Intel
®
QuickPath Interconnect (Intel
®
QPI)
Specifications
The processor Intel QPI specifications in this section are defined at the processor pins.
Routing topologies are dependent on the processors supported and the chipset used in
the design. In most cases, termination resistors are not required as these are
integrated into the processor silicon.
Table 2-17. Intel
®
QuickPath Interconnect (Intel QPI) Specifications
Symbol
Parameter
Min
Nom
Max
Unit
Notes
UIavg
Average UI size at “x” GT/s
(Where x= 4.8 GT/s, 6.4 GT/s, etc.)
0.999 *
nominal
1000/f
1.001 *
nominal
psec
T
slew-rise-fall-pin
Defined as the slope of the rising or
falling waveform as measured between
±100 mV of the differential transmitter
output, for any data or clock.
10
—
25
V / nsec
Z
TX_LOW_CM_DC
Defined as:
± (max(Z
TX_LOW_CM_DC
) –
min(Z
TX_LOW_CM_DC
))
/Z
TX_LOW_CM_DC
expressed in%, over full range of Tx
single ended voltage
-6
0
6
% of
Z
TX_LOW_CM_DC
Z
RX_LOW_CM_DC
Defined as: ±(max(Z
TX_LOW_CM_DC
) –
min(Z
TX_LOW_CM_DC
))
/Z
TX_LOW_CM_DC
expressed in%, over full range of Tx
single ended voltage
-6
0
6
% of
Z
TX_LOW_CM_DC
N
MIN-UI-Validation
# of UI over which the eye mask voltage
and timing specification needs to be
validated
1,000,000
—
—
Z
TX_HIGH_CM_DC
Single ended DC impedance to GND for
either D+ or D- of any data bit at Tx
10 k
—
—
1
Notes:
1. Indicates the output impedance of the transmitter during initialization when the transmitter is “OFF”, that is, the output driver
is disconnected and only the minimum termination is connected. The link detection resistor is assumed not connected when
specifying this parameter.
Z
RX_HIGH_CM_DC
Single ended DC impedance to GND for
either D+ or D- of any data bit at Tx
10 k
—
—
2
2. Used during initialization. It is the state of “OFF” condition for the receiver when only the minimum termination is connected.
Z
TX_LINK_DETECT
Link Detection Resistor
500
—
2000
T
Refclk-Tx-Variability
Phase variability between reference Clk
(at Tx input) and Tx output.
—
—
500
psec
L
D+/D-RX-Skew
Phase skew between D+ and D- lines for
any data bit at Rx
—
—
0.03
UI
T
CLK_DET
Time taken by clock detector to observe
clock stability
—
—
20K
UI
T
CLK_FREQ_DET
Time taken by clock frequency detector
to decide slow vs operational clock after
stable clock
—
—
32
Reference
Clock Cycles
BER
Lane
Bit Error Rate per lane valid for 4.8 GT/s
and 6.4 GT/s
—
—
1.0E-14
Events
TX
EQ-error
% error in Tx equalization setting as
measured by errors in DC levels when
sending a steady “1”.
-10
0
10
% of V
O
QPI_CMP[0]
COMP Resistance
20.79
21
21.21
3
3. COMP resistance must be provided on the system board with 1% resistors. QPI_CMP[0] resistors are to V
SS.
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