AM79C978VCSLASHW datasheet(227/261 Pages) AMD

227 / 261 page

Am79C978

227

SWITCHING CHARACTERISTICS: MEDIA INDEPENDENT INTERFACE

Notes:

1. MDIO valid measured at the exposed mechanical Media Independent Interface.

2. TXCLK and RXCLK frequency and timing parameters are defined for the external physical layer transceiver as defined in the

IEEE 802.3u standard. They are not replicated here.

Parameter

Symbol

Parameter Name

Test Condition

Min

Max

Unit

Transmit Timing

tTVAL

TX_EN and TXD valid from

↑ TX_CLK

measured from Vilmax = 0.8 V or

measured from Vihmin = 2.0V

(Note 1)

Receive Timing

tRSU

RX_DV, RX_ER, RXD setup to

↑ RX_CLK

measured from Vilmax = 0.8 V or

measured from Vihmin = 2.0V

(Note 1)

tRH

RX_DV, RX_ER, RXD hold to

↑ RX_CLK

measured from Vilmax = 0.8 V or

measured from Vihmin = 2.0V

(Note 1)

Management Cycle Timing

tMHIGH

MDC Pulse Width HIGH Time

CLOAD = 390 pf

160

tMLOW

MDC Pulse Width LOW Time

CLOAD = 390 pf

160

tMCYC

MDC Cycle Period

CLOAD = 390 pf

400

tMSU

MDIO setup to

↑ MDC

CLOAD = 470 pf,

measured from Vilmax = 0.8 V or

measured from Vihmin = 2.0V

(Note 1)

tMH

MDIO hold to

↑ MDC

CLOAD = 470 pf,

measured from Vilmax = 0.8 V or

measured from Vihmin = 2.0V

(Note 1)

tMVAL

MDIO valid from

↑ MDC

CLOAD = 470 pf,

measured from Vilmax = 0.8 V or

measured from Vihmin = 2.0V,

(Note 1)

tMCYC -

tMSU

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