DS33R41 Maxim Integrated Products, DS33R41 Datasheet - Page 295
DS33R41
Manufacturer Part Number
DS33R41
Description
Network Controller & Processor ICs Inverse-Multiplexing Ethernet Mapper wit
Manufacturer
Maxim Integrated Products
Datasheet
1.DS33R41.pdf
(335 pages)
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Receive Data (RXD[3:0]) is clocked from the external PHY synchronously with RX_CLK. The RX_CLK signal is
2.5MHz for 10Mbps operation and 25MHz for 100Mbps operation. RX_DV is asserted by the PHY from the first
Nibble of the preamble in 100Mbps operation or first nibble of SFD for 10Mbps operation. The data on RXD[3:0] is
not accepted by the MAC if RX_DV is low or RX_ERR is high (in DTE mode). RX_ERR should be tied low when in
DCE Mode.
Figure 13-3. MII Receive Functional Timing
In RMII Mode, TX_EN is high with the first bit of the preamble. The TXD[1:0] is synchronous with the 50MHz
REF_CLK. For 10Mbps operation, the data bit outputs are updated every 10 clocks.
Figure 13-4. RMII Transmit Interface Functional Timing
RMII Receive data on RXD[1:0] is expected to be synchronous with the rising edge of the 50MHz REF_CLK. The
data is only valid if CRS_DV is high. The external PHY asynchronously drives CRS_DV low during carrier loss.
Figure 13-5. RMII Receive Interface Functional Timing
CRS_DV
TXD[1:0]
TX_EN
REFCLK
REFCLK
RXD[1:0]
RX_CLK
RXD[3:0]
RX_DV
P
P
R
P
R
E
E
R
A
A
M
M
E
B
B
L
L
A
E
E
E
295 of 335
M
B
L
E
F
F
F
C
C
C
S
S
S
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