89hpes24nt3 Integrated Device Technology, 89hpes24nt3 Datasheet - Page 11

• Manufacturer Part Number: 89hpes24nt3
• Description: 24-lane, 3-port Pcie Inter-domain Switch
• Manufacturer: Integrated Device Technology

System Clock Parameters
AC Timing Characteristics
IDT 89HPES24NT3 Data Sheet
Values based on systems running at recommended supply voltages and operating temperatures, as shown in Tables 12 and 13.
Refclk
Refclk
T
V
T
1.
2.
3.
4.
PCIe Transmit
UI
T
T
MAX-JITTER
T
T
T
IDLE
T
DATA
T
PCIe Receive
UI
T
T
MAX JITTER
T
ENTER TIME
T
R
jitter
SW
1.
Parameter
TX-EYE
TX-EYE-MEDIAN-to-
TX-RISE
TX- IDLE-MIN
TX-IDLE-SET-TO-
TX-IDLE-TO-DIFF-
TX-SKEW
RX-EYE (with jitter)
RX-EYE-MEDIUM TO
RX-IDLE-DET-DIFF-
RX-SKEW
, T
The input clock frequency will be either 100 or 125 MHz depending on signal REFCLKM.
ClkIn must be AC coupled. Use 0.01 — 0.1 µF ceramic capacitors.
RCUI (Reference Clock Unit Interval) refers to the reference clock period.
AC coupling required.
Parameter
Minimum, Typical, and Maximum values meet the requirements under PCI Specification 1.1
F
FREQ
DC
2
, T
TX-FALL
Input reference clock frequency range
Duty cycle of input clock
Rise/Fall time of input clocks
Differential input voltage swing
Input clock jitter (cycle-to-cycle)
Unit Interval
Minimum Tx Eye Width
Maximum time between the jitter median and maximum
deviation from the median
D+ / D- Tx output rise/fall time
Minimum time in idle
Maximum time to transition to a valid Idle after sending
an Idle ordered set
Maximum time to transition from valid idle to diff data
Transmitter data skew between any 2 lanes
Unit Interval
Minimum Receiver Eye Width (jitter tolerance)
Max time between jitter median & max deviation
Unexpected Idle Enter Detect Threshold Integration Time
Lane to lane input skew
Description
Description
Table 9 PCIe AC Timing Characteristics
4
Table 8 Input Clock Requirements
11 of 31
Min
399.88
399.88
Min
100
0.6
0.7
0.4
40
50
50
1
Typical
Typical
400
500
400
90
50
.9
1
0.2*RCUI
Max
400.12
400.12
Max
1300
0.15
125
0.3
125
20
20
10
20
1.6
60
1
1
Units
April 11, 2007
RCUI
Unit
MHz
ms
ps
ps
ps
ps
UI
UI
UI
UI
UI
UI
UI
ns
ps
%
V
3