AM79C976 datasheet(278/309 Pages) AMD

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278

Am79C976

8/01/00

P R E L I M INARY

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.

3. tMSU and tMH are input requirements when MDIO is driven by an external PHY device.

4. tMVAL is the output delay when MDIO is driven by the Am79C976 device.

Parameter

Symbol

Parameter Name

Test Condition

Min

Max

Unit

Transmit Timing

tTVAL

TX_EN, TX_ER, TXD valid from

TX_CLK

measured from Vilmax = 0.8 V or

measured from Vihmin = 2.0V

Receive Timing

tRSU

RX_DV, RX_ER, RXD setup to

RX_CLK

measured from Vilmax = 0.8 V or

measured from Vihmin = 2.0V

tRH

RX_DV, RX_ER, RXD hold from

RX_CLK

measured from Vilmax = 0.8 V or

measured from Vihmin = 2.0V

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, 3)

tMH

MDIO hold from

MDC

CLOAD = 470 pf,

measured from Vilmax = 0.8 V or

measured from Vihmin = 2.0V

(Note 1, 3)

tMVAL

MDIO valid from

MDC

CLOAD = 470 pf,

measured from Vilmax = 0.8 V or

measured from Vihmin = 2.0V,

(Note 1, 4)

tMCYC -

tMSU

AM79C976 Datasheet(PDF) 278 Page - Advanced Micro Devices

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