AM79C976 Advanced Micro Devices, AM79C976 Datasheet - Page 278

• Manufacturer Part Number: AM79C976
• Description: PCnet-PRO 10/100 Mbps PCI Ethernet Controller
• Manufacturer: Advanced Micro Devices

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
3. t
4. t
278
Transmit Timing
t
Receive Timing
t
t
Management Cycle Timing
t
t
t
t
t
t
TVAL
RSU
RH
MHIGH
MLOW
MCYC
MSU
MH
MVAL
Parameter
IEEE 802.3u standard. They are not replicated here.
Symbol
MSU
MVAL
and t
is the output delay when MDIO is driven by the Am79C976 device.
MH
TX_EN, TX_ER, TXD valid from
’ TX_CLK
RX_DV, RX_ER, RXD setup to
’ RX_CLK
RX_DV, RX_ER, RXD hold from
’ RX_CLK
MDC Pulse Width HIGH Time
MDC Pulse Width LOW Time
MDC Cycle Period
MDIO setup to ’ MDC
MDIO hold from ’ MDC
MDIO valid from ’ MDC
are input requirements when MDIO is driven by an external PHY device.
Parameter Name
P R E L I M I N A R Y
measured from V
measured from V
measured from V
measured from V
measured from V
measured from V
C
C
C
C
measured from V
measured from V
(Note 1, 3)
C
measured from V
measured from V
(Note 1, 3)
C
measured from V
measured from V
(Note 1, 4)
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
Am79C976
= 390 pf
= 390 pf
= 390 pf
= 470 pf,
= 470 pf,
= 470 pf,
Test Condition
ilmax
ihmin
ilmax
ihmin
ilmax
ihmin
ilmax
ihmin
ilmax
ihmin
ilmax
ihmin
= 0.8 V or
= 0.8 V or
= 0.8 V or
= 0.8 V or
= 2.0V
= 2.0V
= 0.8 V or
= 2.0V
= 0.8 V or
= 2.0V
= 2.0V
= 2.0V,
0
10
10
160
160
400
25
10
t
t
MCYC
MSU
Min
-
25
Max
8/01/00
ns
ns
ns
ns
ns
ns
ns
ns
ns
Unit