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RTL8201CP Datasheet(PDF) 19 Page - Realtek Semiconductor Corp.

Part # RTL8201CP
Description  SINGLE-CHIP/SINGLE-PORT 10/100M FAST ETHERNET PHYCEIVER
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Manufacturer  REALTEK [Realtek Semiconductor Corp.]
Direct Link  https://www.realtek.com/en/
Logo REALTEK - Realtek Semiconductor Corp.

RTL8201CP Datasheet(HTML) 19 Page - Realtek Semiconductor Corp.

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RTL8201CP
Datasheet
Single-Chip/Port 10/100 Fast Ethernet PHYceiver
14
Track ID: JATR-1076-21 Rev. 1.1
7.
Functional Description
The RTL8201CP PHYceiver is a physical layer device that integrates 10Base-T and 100Base-
TX/100Base-FX functions and some extra power management features into a 48-pin single chip that is
used in 10/100 Fast Ethernet applications. This device supports the following functions:
MII interface with MDC/MDIO SMI management interface to communicate with MAC
IEEE 802.3u clause 28 Auto-Negotiation ability
Flow control ability support to cooperate with MAC
Speed, duplex, auto-negotiation ability configurable by hard wire or MDC/MDIO
Flexible LED configuration
7-wire SNI (Serial Network Interface) support (only in 10Mbps mode)
Power Down mode support
4B/5B transform
Scrambling/De-scrambling
NRZ to NRZI, NRZI to MLT-3
Manchester Encode and Decode for 10Base-T operation
Clock and Data recovery
Adaptive Equalization
Far End Fault Indication (FEFI) in fiber mode
7.1. MII and Management Interface
7.1.1.
Data Transition
To set the RTL8201CP for MII mode operation, pull MII/SNIB pin high and set the ANE, SPEED, and
DUPLEX pins.
The MII (Media Independent Interface) is an 18-signal interface (as described in IEEE 802.3u) supplying
a standard interface between the PHY and MAC layer. This interface operates at two frequencies –
25Mhz and 2.5Mhz to support 100Mbps/10Mbps bandwidth for both transmit and receive functions.
Transmission
The MAC asserts the TXEN signal. It then changes byte data into 4-bit nibbles and passes them to the
PHY via TXD[0..3]. The PHY will sample TXD[0..3] synchronously with TXC — the transmit clock
signal supplied by PHY – during the interval TXEN is asserted.
Reception
The PHY asserts the RXEN signal. It passes the received nibble data RXD[0..3] clocked by RXC. CRS
and COL signals are used for collision detection and handling.
In 100Base-TX mode, when the decoded signal in 5B is not IDLE, the CRS signal will assert. When 5B is
recognized as IDLE it will be de-asserted. In 10Base-T mode, CRS will assert when the 10M preamble
has been confirmed and will be de-asserted when the IDLE pattern has been confirmed.


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