MSC8113 Reference Manual, Rev. 0
25-12
Freescale Semiconductor
Ethernet Controller
25.6
Ethernet Controller Interfaces
The following sections give a detailed functional description of the supported interfaces.
Table 25-7. Ethernet Controller Interface Signals In RMII Mode
Signal Name
Type
Description
Reset
State
ETHTXD[1–0]
O
MII Transmit Data Bits 1–0
0
ETHTX_EN
O
MII Transmit Enable
0
ETHREF_CLK
I
RMII Synchronous Clock Reference, REF_CLK
The ETHREF_CLK is a 50 MHz Clock. and is defined as a synchronous clock reference
for receive, transmit, and control.
—
CRS_DV
I
Carrier Sense/Receive Data Valid
—
ETHRXD[1–0]
I
MII - Receive Data Bits 3–0
—
ETHRX_ER
I
MII Receive Error
Use of this signal is optional.
—
ETHMDC
O
Management Clock
This output signal is the clock of the management interface. ETHMDIO should be
synchronized with this clock (typically 2.5 MHz) which is supplied by the MAC. The IEEE
standard sets the minimum period at 400 ns or 2.5 MHz, but the device can be configured
as fast as 12.5 MHz, if the PHY supports that speed.
—
ETHMDIO
I/O
Management Data
ETHMDIO is a bidirectional signal to input PHY-supplied status during management read
cycles and output control during management write cycles.
—
Table 25-8. Ethernet Controller Interface Signals In SMII Mode
Signal Name
Type
Description
Reset
State
ETHSYNC
O
Transmit Synchronization Control Signal
Used in SMII MAC-to-PHY (Sync Out) mode. This signal is not used in MAC-to-MAC
(Sync In) mode.
0
ETHTXD
O
Transmit Data
0
ETHRXD
I
Receive Data
—
ETHSYNC_IN
I
Receive Synchronization Control Signal
Used in SMII MAC-to-MAC Sync In mode. This signal is not used in Sync Out mode.
—
ETHCLOCK
I
Clock
Global 125MHz reference clock.
—
ETHMDC
O
Management Clock
The clock of the management interface. ETHMDIO should be synchronized with this clock
(typically 2.5 MHz) which is supplied by the MAC. The IEEE standard sets the minimum
period at 400 ns or 2.5 MHz, but the device can be configured as fast as 12.5 MHz, if the
PHY supports that speed.
—
ETHMDIO
I/O
Management Data
Inputs PHY-supplied status during management read cycles and outputs control during
management write cycles.
—
Содержание MSC8113
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