LAN8187_06 Datasheet, PDF (55/72 Pages) SMSC Corporation – ±15kV ESD Protected MII/RMII Fast-Ethernet PHY with HP Auto-MDIX and SMSC flexPWRTM

±15kV ESD Protected MII/RMII Fast-Ethernet PHY with HP Auto-MDIX and SMSC flexPWR^TM
Datasheet
Chapter 6 AC Electrical Characteristics
The timing diagrams and limits in this section define the requirements placed on the external signals
of the Phy.
6.1
Serial Management Interface (SMI) Timing
The Serial Management Interface is used for status and control as described in Section 4.13.
MDC
T1.1
MDIO
(Read from PHY)
Valid Data
T1.2
MDIO
(Write to PHY)
T1.3
T1.4
Valid Data
Figure 6.1 SMI Timing Diagram
PARAMETER
T1.1
T1.2
T1.3
T1.4
Table 6.1 SMI Timing Values
DESCRIPTION
MDC minimum cycle time
MDC to MDIO (Write) delay
MDIO (Read) to MDC setup
MDIO (Read) to MDC hold
MIN TYP
400
0
10
10
MAX
300
UNITS
ns
ns
ns
ns
NOTES
SMSC LAN8187/LAN8187I
55
DATASHEET
Revision 1.0 (12-14-06)