DS33R11 Maxim Integrated Products, DS33R11 Datasheet - Page 45
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DS33R11
Manufacturer Part Number
DS33R11
Description
Network Controller & Processor ICs Ethernet Mapper with Integrated T1-E1-J1
Manufacturer
Maxim Integrated Products
Datasheet
1.DS33R11.pdf
(344 pages)
Specifications of DS33R11
Product
Framer
Number Of Transceivers
1
Supply Voltage (max)
1.89 V, 3.465 V
Supply Voltage (min)
1.71 V, 3.135 V
Supply Current (max)
100 mA
Maximum Operating Temperature
+ 85 C
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Package / Case
BGA
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DS33R11 Ethernet Mapper with Integrated T1/E1/J1 Transceiver
9.1.1 Ethernet Interface Clock Modes
The Ethernet PHY interface has several different clocking requirements, depending on the mode of operation.
Table 9-1
outlines the possible clocking modes for the Ethernet Interface. The buffered REF_CLKO output is
generated by division of the 100MHz system clock input by the user on SYSCLKI. The frequency of the
REF_CLKO pin is automatically determined by the DS33R11 based on the state of the RMIIMIIS pin. The
REF_CLKO function can be turned off with the GL.CR1.RFOO bit. Note that in DCE and RMII operating modes,
the REF_CLKO signal should not be used to provide an input to REF_CLK, due to the reset requirements in these
operating modes.
In RMII mode, receive and transmit timing is always synchronous to a 50 MHz clock input on the REF_CLK pin.
The source of REF_CLK is expected to be the external PHY. The user has the option of using the 50MHz
REF_CLKO output as the timing source for the PHY. More information on RMII mode can be found in
Section 9.15.2.
While using MII mode with DTE operation, the MII clocks (RX_CLK and TX_CLK) are inputs that are expected to
be provided by the external PHY. While using MII mode with DCE operation, the MII clocks (TX_CLK and
RX_CLK) are output by the DS33R11, and are derived from the 25MHz REF_CLK input. More information on MII
mode can be found in Section 9.15.1.
9.1.2 Serial Interface Clock Modes
The serial interface timing is determined by the line clocks. Both the transmit and receive clocks (TCLKE and
RCLKI) are inputs, and can be gapped.
45 of 344
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