VSC8221 datasheet(40/138 Pages) MICROSEMI

Part #	VSC8221

Description	Single Port 10/100/1000BASE-T PHY with1.25 Gbps SerDes for SFPs/GBICs

PDF	138 Pages

Scroll/Zoom	100%

Manufacturer	MICROSEMI [Microsemi Corporation]

Direct Link	http://www.microsemi.com

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40 / 138 page

VSC8221

Data Sheet

VMDS-10106 Revision 4.1

December 2006

40 of 40

Figure 13. MDiO Write Frame

12.3 SMi interrupt

The SMi includes an output signal MDiNT for signaling the Station Manager when certain events occur in the PHY. The MDiNT

pin can be configured for active-low or active-high operation by tying the pin to either a pull-up resistor to VDDiOMiCRO or to a

pull-down resistor to GND.

Figure 14. Logical Representation of MDiNT Pin

MDC

MDIO

Preamble

(optional)

SFD

Write

PHY Address

A4 A3 A2 A1 A0 R4 R3 R2 R1 R0

to PHY

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

Idle

Station Manager Drives MDIO (PHY tristates MDIO during entire sequence)

MDINT

(to Station Manager)

Interrupt Enable (Register 25.15)

PHY

Interrupt Status (Register 26.15)

4.7k-10k External

Pull-up

at Station Manager

VDDIOMICRO

VSC8221

MDINT

4.7k-10k External

Pull-down

at Station Manager

VSC8221 Datasheet(PDF) 40 Page - Microsemi Corporation