BCM4354 Data Sheet
PCI Express Interface Parameters
PCI Express Interface Parameters
Table 60: PCI Express Interface Parameters
Parameter
Symbol
Comments
Minimum Typical Maximum Unit
General
Baud rate
BPS
Vref
–
–
1
5
–
–
–
Gbaud
V
Reference clock
amplitude
LVPECL
Receiver
Differential termination ZRX-DIFF-DC
Differential termination 80
100
50
120
60
ꢀ
ꢀ
DC impedance
ZRX-DC
DC common-mode
impedance
40
Powered down
termination (POS)
ZRX-HIGH-IMP-DC- Power-down or RESET 100k
POS high impedance
–
–
–
–
–
–
–
–
ꢀ
Powered down
termination (NEG)
ZRX-HIGH-IMP-DC- Power-down or RESET 1k
ꢀ
NEG
high impedance
Input voltage
VRX-DIFFp-p
AC coupled, differential 175
p-p
mV
UI
Jitter tolerance
TRX-EYE
Minimum receiver eye 0.4
width
Differential return loss RLRX-DIFF
Differential return loss 10
–
–
–
–
dB
dB
Common-mode return RLRX-CM
loss
Common-mode return
loss
6
Unexpected electrical TRX-IDEL-DET-
An unexpected
–
–
–
10
ms
idle enter detect
threshold integration
time
DIFF-ENTERTIME electrical idle must be
recognized no longer
than this time to signal
an unexpected idle
condition.
Signal detect threshold VRX-IDLE-DET-
DIFFp-p
Electrical idle detect
threshold
65
175
mV
Transmitter
Output voltage
VTX-DIFFp-p
VTX-RISE
Differential p-p,
programmable in 16
steps
0.8
–
–
1200
–
mV
UI
Output voltage rise
time
20% to 80%
0.125
(2.5 GT/s)
0.15
(5 GT/s)
Output voltage fall time VTX-FALL
80% to 20%
0.125
(2.5 GT/s)
–
–
UI
0.15
(5 GT/s)
Broadcom®
October 15, 2014 • 4354-DS109-R
Page 177
BROADCOM CONFIDENTIAL
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