Datasheet, Volume 1
33
Electrical Specifications
§
Table 2-18. Parameter Values for Intel
®
QuickPath Interconnect (Intel
®
QPI) Channel at
6.4 GT/s
1
Notes:
1. It is expected that the receiver will have equalization, which will boost received voltage and mitigate timing jitter, with the
minimum level of swing specified. Platform electrical design should determine the optimum level of equalization necessary,
depending on the link.
Symbol
Parameter
Min
Nom
Max
Unit
Notes
Z
TX_LOW_CM_DC
DC resistance of Tx terminations at half the
single ended swing (which is usually 0.25*V
Tx-
diff-pp-pin
) bias point
38
—
52
ohms
Z
RX_LOW_CM_DC
DC resistance of Rx terminations at half the
single ended swing (which is usually 0.25*V
Tx-
diff-pp-pin
) bias point
38
—
52
ohms
V
Tx-diff-pp-pin
Transmitter Differential swing
800
—
1400
mV
V
Tx-cm-dc-pin
Transmitter output DC common mode, defined as
average of V
D+
and V
D-
0.23
—
27
Fraction of
V
TX-diff-pp-pin
V
Tx-cm-ac-pin
Transmitter output AC common mode, defined as
((V
D+
+ V
D–
)/2 – V
TX-cm-dc-pin
).
–0.0375
—
0.0375
Fraction of
V
TX-diff-pp-pin
TX
duty-pin
Average of UI-UI jitter
-0.05
—
0.05
UI
TX
jitUI-UI-1E-7pin
UI-UI jitter measured at Tx output pins with 1E-7
probability
-0.07
—
0.07
UI
TX
jitUI-UI-1E-9pin
UI-UI jitter measured at Tx output pins with 1E-9
probability
-0.075
—
0.075
UI
TX
clk-acc-jit-N_UI-1E-7
P-p accumulated jitter out of any Tx data or clock
over 0
n
N UI where N=12, measured with
1E-7 probability.
0
—
0.18
UI
TX
clk-acc-jit-N_UI-1E-9
P-p accumulated jitter out of any Tx data or clock
over 0
n
N UI where N=12, measured with 1E-
9 probability.
0
—
0.2
UI
T
Tx-data-clk-skew-pin
Delay of any data lane relative to clock lane, as
measured at Tx output (UI)
-0.5
—
0.5
UI
T
Rx-data-clk-skew-pin
Delay of any data lane relative to the clock lane,
as measured at the end of Tx+Channel. This
parameter is a collective sum of effects of data
clock mismatches in Tx and on the medium
connecting Tx and Rx. (UI).
-1
—
4
UI
V
Rx-cm-dc-pin
DC common mode ranges at the Rx input for any
data or clock channel, defined as average of V
D+
and V
D-
(mV)
90
—
350
mV
V
Rx-cm-ac-pin
AC common mode ranges at the Rx input for any
data or clock channel, defined as ((VD+ + VD-)/2
– VRX-cm-dc-pin).
–50
—
50
mV
T
Rx-margin
Measured timing margin during receiver
margining with any receiver equalizer off
0.1
—
UI
V
Rx-margin
Measured voltage margin during receiver
margining with receiver equalizer off
40
—
mV
T
Rx-margin-RxEQ
Measured timing margin during receiver
margining with receiver equalizer on and at the
optimum setting that maximizes the timing
margin
0.12
—
UI
V
Rx-margin-RxEQ
Measured voltage margin during receiver
margining with receiver equalizer on and at the
optimum setting that maximizes the voltage
margin
50
—
mV