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VSC8221 Datasheet(PDF) 119 Page - Microsemi Corporation

Part # VSC8221
Description  Single Port 10/100/1000BASE-T PHY with1.25 Gbps SerDes for SFPs/GBICs
PDF  138 Pages
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Manufacturer  MICROSEMI [Microsemi Corporation]
Direct Link  http://www.microsemi.com
Logo MICROSEMI - Microsemi Corporation

VSC8221 Datasheet(HTML) 119 Page - Microsemi Corporation

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VSC8221
Data Sheet
VMDS-10106 Revision 4.1
December 2006
119 of 123
123
28.2 SMi Timing
The following specifications are valid only when the i/O power supply (VDDiOMiCRO) is at either 3.3 V, ±5%, or 2.5 V, ±5%.
Note: A 4.7k to 10k pullup is recommended on the MDiNT.
Figure 25. SMi AC Timing
Table 54. SMi Timing Specifications
Symbol
Min
Typ
Max
Unit
Parameter Description & Conditions
FMDC
0
2.5
12.5
MHz
MDC clock frequency.
TMDC-High
20
50
ns
MDC clock pulse width high.
TMDC-Low
20
50
ns
MDC clock pulse width low.
TMDiO-Setup
10
ns
MDiO to MDC setup time when sourced by the
station manager.
TMDiO-Hold
10
ns
MDiO to MDC hold time when sourced by the
station manager.
TMDiO-Delay
10
300
ns
MDC to MDiO delay time from VSC8221.
Delay depends on the value of external pull-up
resistor on MDiO pin.
MDC
T
MDIO-Setup
Data
MDC
T
MDIO-Hold
T
MDC-High
T
MDC-Low
T
MDIO-Delay
Data
F
MDC
MDIO
(input)
MDIO
(output)



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