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LAN8720AI Fiches technique(PDF) 73 Page - SMSC Corporation

No de pièce LAN8720AI
Description  Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
PDF  79 Pages
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Fabricant  SMSC [SMSC Corporation]
Site Internet  http://www.smsc.com
Logo SMSC - SMSC Corporation

LAN8720AI Fiches technique(HTML) 73 Page - SMSC Corporation

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Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
Datasheet
SMSC LAN8720A/LAN8720Ai
73
Revision 1.4 (08-23-12)
DATASHEET
5.5.4.3
RMII CLKIN Requirements
5.5.5
SMI Timing
This section specifies the SMI timing of the device. Please refer to Section 3.5, "Serial Management
Interface (SMI)," on page 28 for additional details.
Table 5.11 RMII CLKIN (REF_CLK) Timing Values
PARAMETER
MIN
TYP
MAX
UNITS
NOTES
CLKIN frequency
50
MHz
CLKIN Frequency Drift
± 50
ppm
CLKIN Duty Cycle
40
60
%
CLKIN Jitter
150
psec
p-p – not RMS
Figure 5.6 SMI Timing
Table 5.12 SMI Timing Values
SYMBOL
DESCRIPTION
MIN
MAX
UNITS
NOTES
tclkp
MDC period
400
ns
tclkh
MDC high time
160 (80%)
ns
tclkl
MDC low time
160 (80%)
ns
tval
MDIO (read from PHY) output valid from rising
edge of MDC
300
ns
tohold
MDIO (read from PHY) output hold from rising
edge of MDC
0ns
tsu
MDIO (write to PHY) setup time to rising edge
of MDC
10
ns
tihold
MDIO (write to PHY) input hold time after rising
edge of MDC
10
ns
MDC
MDIO
tclkh
tclkl
tclkp
tohold
MDIO
tsu tihold
(Data-Out)
(Data-In)
tohold
tval



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