LAN9303MI-AKZE Datasheet, PDF (202/386 Pages) SMSC Corporation – Small Form Factor Three Port 10/100 Managed Ethernet Switch with Dual MII/RMII/Turbo MII

Small Form Factor Three Port 10/100 Managed Ethernet Switch with Dual MII/RMII/Turbo MII
Datasheet
13.2.7.7 Port 1 MII Basic Control Register (P1_MII_BASIC_CONTROL)
Offset:
1ECh
Size:
32 bits
This register is re-written in its entirety by the EEPROM Loader following the release of reset or a
RELOAD command. Refer to Section 8.4, "EEPROM Loader," on page 121 for additional information.
BITS
DESCRIPTION
31
30
29
28
27
26
25:24
RESERVED
Switch Looopback Port 1
When set, transmissions from the Switch Fabric Port 1 are not sent to the
External MAC. Instead, they are looped back into the Switch Engine.
From the MAC viewpoint, this is effectively a FAR LOOPBACK.
If loopback is enabled during half-duplex operation, then the Enable Receive
Own Transmit bit in the (x=1) Port x MAC Receive Configuration Register
(MAC_RX_CFG_x) must be set for this port. Otherwise, the Switch Fabric
will ignore receive activity when transmitting in half-duplex mode.
Note: This mode works even if the Isolate bit is set.
Note: This bit is used when Port 1 is in MII or RMII PHY mode. It is not
usable in internal PHY or MII MAC modes.
RESERVED
Manual Duplex
When set, the duplex is based on the Duplex Mode bit. When clear, the
duplex is based on the P1_DUPLEX input and duplex_pol_strap_1.
Note: This bit is used when Port 1 is in the MII MAC mode. It is not
usable in internal PHY or MII or RMII PHY modes.
RESERVED
Turbo MII Enable
This bit, along with the Speed Select LSB bit, determines the speed of the
MII PHY mode.
When set, the Speed Select LSB bit selects between 200Mbps and 10
Mbps. When cleared, the Speed Select LSB bit selects between 100Mbps
and 10 Mbps.
Note:
When operating at 200Mbps, the drive strength of the MII output
clock is selected using the RMII/Turbo MII Clock Strength bit. When
at 100 Mbps or 10 Mbps, the drive strength is fixed at 12 mA.
Mode
This field indicates the operating mode of port 1.
00: MII MAC mode
01: MII PHY mode
10: RMII PHY mode
11: Internal PHY mode
TYPE
RO
R/W
RO
R/W
RO
R/W
RO
DEFAULT
-
0b
-
0b
-
Note 13.56
Note 13.57
Revision 1.5 (07-08-11)
202
DATASHEET
SMSC LAN9303M/LAN9303Mi