AM79C978 Advanced Micro Devices, AM79C978 Datasheet - Page 227

• Manufacturer Part Number: AM79C978
• Description: Single-Chip 1/10 Mbps PCI Home Networking 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
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
TX_EN and TXD valid from
RX_DV, RX_ER, RXD setup to
RX_DV, RX_ER, RXD hold to
MDC Pulse Width HIGH Time
MDC Pulse Width LOW Time
MDC Cycle Period
MDIO setup to
MDIO hold to
MDIO valid from
TX_CLK
RX_CLK
RX_CLK
Parameter Name
MDC
MDC
MDC
measured from V
measured from V
(Note 1)
measured from V
measured from V
(Note 1)
measured from V
measured from V
(Note 1)
C
C
C
C
measured from V
measured from V
(Note 1)
C
measured from V
measured from V
(Note 1)
C
measured from V
measured from V
(Note 1)
LOAD
LOAD
LOAD
LOAD
LOAD
LOAD
Am79C978
= 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
10
10
t
t
MCYC
MSU
Min
-
25
Max
ns
ns
ns
ns
ns
ns
ns
ns
ns
Unit
227