5220-DS02-R datasheet(80/90 Pages) BOARDCOM

80 / 90 page

BCM5220

Preliminary Data Sheet

04/20/04

Broa d c om Co rp o r a t i o n

Page 68

Auxiliary Status 4 Register (Shadow Register)

Document

5220-DS04-405-R

Management data interface timing parameters are described in Table 49. Figure 14 and Figure 15 illustrate two types of

management interface timing.

Figure 14: Management Interface Timing

Figure 15: Management Interface Timing (with Preamble Suppression On)

Table 49: Management Data Interface Timing

Parameter

Symbol

Min

Typ

Max

Unit

MDC Cycle Time

MDC High/Low

MDC Rise/Fall Time

MDIO Input Setup Time to MDC rising

MDIO Input Hold Time from MDC rising

MDIO Output Delay from MDC rising

MDIO (From BCM5220)

MDC

MDC_FALL

MDIO_HOLD

MDIO_SETUP

MDC_RISE

MDC_CYCLE

MDIO_SETUP

MDIO_HOLD

MDIO_DELAY

MDIO (Into BCM5220

)

MDC

SKIP

Hi-Z (PHY Pull-UP)

IDLE

MDIO

Start of MDC/MDIO Cycle

End of MDC/MDIO Cycle

Note: Must wait two MDC clock cycles between MDIO commands when

preamble suppression is activated (MII register 1, Bit 6 set to 1).

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