参数资料
型号: 89HPES16T4G2
厂商: Integrated Device Technology, Inc.
英文描述: 16-Lane 4-Port Gen2 PCI Express Switch
中文描述: 16巷4端口第二代的PCI Express开关
文件页数: 11/32页
文件大小: 305K
代理商: 89HPES16T4G2
11 of 32
September 4, 2007
IDT 89HPES16T4G2 Data Sheet
A
S ystem Clock Parameters
Values based on systems running at recommended supply voltages and operating temperatures, as shown in Tables 13 and 14.
AC T iming Charac teristic s
Parameter
Desc ription
Condition
Min
Typic al
Max
Unit
Refclk
FREQ
Input reference clock frequency range
100
125
1
1.
The input clock frequency will be either 100 or 125 MHz depending on signal REFCLKM.
MHz
T
C-RISE
Rising edge rate
Differential
0.6
4
V/ns
T
C-FALL
Falling edge rate
Differential
0.6
4
V/ns
V
IH
Differential input high voltage
Differential
+150
mV
V
IL
Differential input low voltage
Differential
-150
mV
V
CROSS
Absolute single-ended crossing point
voltage
Single-ended
+250
+550
mV
V
CROSS-DELTA
Variation of V
CROSS
over all rising clock
edges
Single-ended
+140
mV
V
RB
Ring back voltage margin
Differential
-100
+100
mV
T
STABLE
Time before V
RB
is allowed
Differential
500
ps
T
PERIOD-AVG
Average clock period accuracy
-300
2800
ppm
T
PERIOD-ABS
Absolute period, including spread-spec-
trumand jitter
9.847
10.203
ns
T
CC-JITTER
Cycle to cycle jitter
150
ps
V
MAX
Absolute maximuminput voltage
+1.15
V
V
MIN
Absolute mnimuminput voltage
-0.3
V
Duty Cycle
Duty cycle
40
60
%
Rise/Fall Matching
Single ended rising Refclk edge rate ver-
sus falling Refclk edge rate
20
%
Z
C-DC
Clock source output DC impedance
40
60
Ω
Table 9 Input Clock Requirements
Parameter
Desc ription
Gen 1
Gen 2
Units
Min
1
Typ
1
Max
1
Min
1
Typ
1
Max
1
PCIe Transmit
UI
Unit Interval
399.88
400
400.12
199.94
200
200.06
ps
T
TX-EYE
MnimumTx Eye Width
0.75
0.75
UI
T
TX-EYE-MEDIAN-to-
MAX-JITTER
Maximumtime between the jitter median and maxi-
mumdeviation fromthe median
0.125
UI
T
TX-RISE
, T
TX-FALL
TX Rise/Fall Time: 20% - 80%
0.125
0.15
UI
T
TX- IDLE-MIN
Mnimumtime in idle
20
20
UI
Table 10 PCIe AC Timing Characteristics (Part 1 of 2)
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