Direct Slave Interface, System Bus, Ethernet, and Interrupt Signals
MSC8122 Technical Data, Rev. 13
Freescale Semiconductor
1-7
HD55
D55
ETHTX_ER
Reserved
Input/ Output
Input/ Output
Output
Input
Host Data Bus 55
Bit 55 of the DSI data bus.
System Bus Data 55
For write transactions, the bus master drives valid data on this line. For read transactions, the slave drives
valid data on this bus.
Ethernet Transmit Data Error
In MII mode only, indicates a transmit data error.
In RMII mode, this pin is reserved and can be left unconnected.
HD56
D56
ETHRX_DV
ETHCRS_DV
Input/ Output
Input/ Output
Input
Input
Host Data Bus 56
Bit 56 of the DSI data bus.
System Bus Data 56
For write transactions, the bus master drives valid data on this line. For read transactions, the slave drives
valid data on this bus.
Ethernet Receive Data Valid
Indicates that the receive data is valid.
Ethernet Carrier Sense/Receive Data Valid
In RMII mode, indicates that a carrier is detected and after the connection is established that the receive
data is valid.
HD57
D57
ETHRX_ER
Input/ Output
Input/ Output
Input
Host Data Bus 57
Bit 57 of the DSI data bus.
System Bus Data 57
For write transactions, the bus master drives valid data on this line. For read transactions, the slave drives
valid data on this bus.
Ethernet Receive Data Error
In MII and RMII modes, indicates a receive data error.
HD58
D58
ETHMDC
Input/ Output
Input/ Output
Output
Host Data Bus 58
Bit 58 of the DSI data bus.
System Bus Data 58
For write transactions, the bus master drives valid data on this line. For read transactions, the slave drives
valid data on this bus.
Ethernet Management Clock
In MII and RMII modes, used for the MDIO reference clock.
HD59
D59
ETHMDIO
Input/ Output
Input/ Output
Input/ Output
Host Data Bus 59
Bit 59 of the DSI data bus.
System Bus Data 59
For write transactions, the bus master drives valid data on this line. For read transactions, the slave drives
valid data on this bus.
Ethernet Management Data
In MII and RMII modes, used for station management data input/output.
Table 1-5.
DSI, System Bus, Ethernet, and Interrupt Signals (Continued)
Signal Name
Type
Description