
S1S60000 Technical Manual
16
EPSON
Rev.1.5
3.2
Management Interface
S1S60000 supports MII management interface.
It can write or read registers in PHY through this interface.
Fig.3.3 and 3.4 show the waveforms in the read and write operations, respectively.
Fig.3.3
MII Management Interface Read Operation
Fig.3.4
MII Management Interface Write Operation
3.3
Connecting PHY Chips
Fig.3.5 shows connection between S1S60000 and PHY chips.
You do not have to connect CRS for Full Duplex communication only.
Also, TX_ER signal is not connected.
[ Important ]
Make necessary setting so that the PHY chip address becomes 0
×01 all the time. Operation cannot be
guaranteed if set to any other setting.
In the normal operation and the power save mode, OSC pin on S1S60000 outputs the signal being formed after
buffering OSC3 input.
Thus connecting a 25MHz crystal oscillator to OSC3 input and connecting OSCO to the
clock of PHY allows you operate both S1S60000 and PHY with a single crystal oscillator.
Note: Before supplying clock form OSCO to PHY, make sure that it meets the clock accuracy required by PHY.
Also make sure that length of the pattern connected is minimized and the clock waveform satisfies
requirements of the PHY specification.
After deciding a PHY chip to be used, acquire result of auto negotiation, speed (100BASE/10BASE) established
by link and bit information showing the mode (Full Duplex/ Half Duplex) and arrange so that they are reflected
to the ANEGR register. (Realtek Company’s RTL8201L is not equipped with a register for storing result of auto
negotiation and cannot be used for S1S60000. )
Acquiring Method of ANEGR Register Value
(1) Seek for a register in which result of auto negotiation can be stored. In general, it is available between 16 and
19 or at 24 or 25.
(2) Set the value obtained by subtracting 16 from the register offset to LSOFF bit.
(3) Set DINV and SINV according to the result storing method.
(4) Set each bit of DUPLEX and SPEED depending on the result store bit position.
32bit
preamble Start of
frame
read
Z 1 1 1
1 0 1 1 0 A A A A A R R R R R Z 0 D D D D D
D Z
PHY
address
PHY
register
Turnaround
16bit
Data
MDC
MDIO
32bit
preamble Start of
frame
write
Z 1 1 1
1 0 1
1
0
A A A A A R R R R R 1 0 D D D D D
D Z
PHY
address
PHY
register
Turnaround
16bit
Data
MDC
MDIO