SWITCHING CHARACTERISTICS: MEDIA INDEPENDENT INTERFACE
Parameter
Symbol
Parameter Name
Test Condition
Min
Max
Unit
Transmit Timing
measured from Vilmax = 0.8 V or
measured from Vihmin = 2.0V
(Note 1)
TX_EN and TXD valid from
tTVAL
0
25
ns
↑ TX_CLK
Receive Timing
measured from Vilmax = 0.8 V or
measured from Vihmin = 2.0V
(Note 1)
RX_DV, RX_ER, RXD setup to
tRSU
10
10
ns
ns
↑ RX_CLK
measured from Vilmax = 0.8 V or
measured from Vihmin = 2.0V
(Note 1)
RX_DV, RX_ER, RXD hold to
tRH
↑ RX_CLK
Management Cycle Timing
tMHIGH
tMLOW
tMCYC
MDC Pulse Width HIGH Time
CLOAD = 390 pf
160
160
400
ns
ns
ns
MDC Pulse Width LOW Time
MDC Cycle Period
CLOAD = 390 pf
CLOAD = 390 pf
CLOAD = 470 pf,
measured from Vilmax = 0.8 V or
measured from Vihmin = 2.0V
(Note 1)
tMSU
MDIO setup to ↑ MDC
MDIO hold to ↑ MDC
MDIO valid from ↑ MDC
10
10
ns
ns
ns
CLOAD = 470 pf,
measured from Vilmax = 0.8 V or
measured from Vihmin = 2.0V
(Note 1)
tMH
CLOAD = 470 pf,
measured from Vilmax = 0.8 V or
measured from Vihmin = 2.0V,
(Note 1)
tMCYC
tMSU
-
tMVAL
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.
Am79C978
227
AMD [ AMD ]
