
RTL8305S
2002/02/19
Rev. 1.2
15
The illustrations below show a summary of MII/SNI application circuits for port4 of the RTL8305S.
Note that, as described above, the pins MRXC, MRXDV and MRXD in MII/SNI PHY mode are pins MTXC, MTXEN and
MTXD in MII MAC mode, and vice versa.
RTL8305S
51 MTXC/MRXC
52 MTXEN/MRXDV
59 MRXC/MTXC
60 MRXDV/MTXEN
67~61
58 COL
Routing Engine
RXC
CRS
RXDV
RXD[3:0]
TXC
TXEN
TXD[3:0]
COL
Routing Engine
RXC
CRS
RXDV
RXD
TXC
TXEN
TXD
COL
1
1
10MHz
MII PHY mode
SNI PHY mode
4
4
25M/2.5MHz
Hom ePHY
AM 79C901A
DP83851
RXC
CRS
RXDV
RXD[3:0]
TXC
TXEN
TXD[3:0]
COL
MII MAC mode (HomePNA Application)
4
4
1MHz
Single PH Y
RXC
CRS
RXDV
RXD[3:0]
TXC
TXEN
TXD[3:0]
COL
MII MAC mode (100Base-FX Application)
4
4
25MHz
Fiber
Transceiber
P4Mode[0]
P4Mode[1]
P4FlCtrl#
EnP4Led
P4LnkSta#
P4SpdSta#
P4DupSta#
SelMiiMac#
Floating=High
Note1
Note1
Not used
RTL8305S
52 MTXEN/MRXDV
54
59 MRXC/MTXC
60 MRXDV/MTXEN
61
58 COL
P4Mode[0]
P4Mode[1]
P4FlCtrl#
EnP4Led
P4LnkSta#
P4SpdSta#
P4DupSta#
SelMiiMac#
Floating=10M
Not used
51 MTXC/MRXC
Pull-down=Link On
RTL8305S
60 MRXDV/MTXEN
67~61 MRXD[3:0]/
51 MTXC/MRXC
52 MTXEN/MRXDV
57-54 MTXD[3:0]/
58 COL
P4Mode[0]
P4Mode[1]
P4FlCtrl#
EnP4Led
P4LnkSta#
P4SpdSta#
P4DupSta#
SelMiiMac#
Used
59 MRXC/MTXC
RTL8305S
60 MRXDV/MTXEN
67~61 MRXD[3:0]/
51 MTXC/MRXC
52 MTXEN/MRXDV
57-54 MTXD[3:0]/
58 COL
P4Mode[0]
P4Mode[1]
P4FlCtrl#
EnP4Led
P4LnkSta#
P4SpdSta#
P4DupSta#
SelMiiMac#
Used
59 MRXC/MTXC
Pull-down=100M
Note1
x
Floating=High
x
x
Floating=High
x
x
Note1
Note1
Note1
x
Floating=High
x
Floating=High
x
x
x
Floating=High
Floating=High
Pull-down=Link On
Pull-down=Link On
Pull-down=Link On
Floating=High
x
Note1
Floating=High
x
Floating=High
x
Floating=High
x
Floating=High
x
/MRXD[3:0]
MRXD[3:0]/MTXD[3:0]
MTXD[3:0]
57-54
MTXD[0]/MRXD[0]
MRXD[0]/MTXD[0]
MTXD[3:0]
MRXD[3:0]
MTXD[3:0]
MRXD[3:0]
Note 1: Floating or Pull-down states depend on application.
Note 2: For general cases, most of the option pins should be floating (=High=Enable), except for EnBrdCtrl. This means that
EnBrdCtrl should be pulled down (=Low=Disable) for normal applications.