BECKHOFF ET1100 - Manual (Page 106)

Example Schematics
III-92 Slave Controller – ET1100 Hardware Description
9.8 Transparent Mode
ET1100
CLK25OUT1/2
Ethernet PHY
RX_DV
RX_DATA[3:0]
RX_ERR
TX_ENA
TX_DATA[3:0]
RX_CLK
RX_DV
RXD[3:0]
RX_ER
TX_EN
TXD[3:0]
RX_CLK
TX_CLK
CLK25
CRS
TX_ER
COL
LINK_MII LI NK_STATUS
MI_DATA
MI_CLK
MDIO
MDC
4
K
7
V
CC I/O
W
PU
V
CC I/O
Alternative MAC
RX_DV
RX_DATA[3:0]
RX_ERR
TX_ENA
TX_DATA[3:0]
RX_CLK
MI_DATA
MI_CLK
4
K
7
TX_CLK
TX_ER
COL
CRS
LI NKACT
To RJ45/
Magnetics
MAC Enable Drivers may be embedded in the
alternative MAC
ET1100 is Link/Act LED source,
even if port is transparent
TRANS(x)
Connect MII Management
signals to alternative MAC
only if all ET1100 MII ports
can become transparent
RESET RESET
RESET
Figure 52: Transparent Mode
NOTE: MI_DATA outputs of alternative MAC have to be high-Z if ET1100 is controlling PHY management
interface, otherwise add driver (like MI_CLK). Check
alternative MAC’s TX timings when extra drivers are used.