KSZ8721SL Micrel Inc, KSZ8721SL Datasheet - Page 13
![IC TXRX PHY 10/100 3.3V 48-SSOP](/photos/6/84/68448/576-48-ssop_sml.jpg)
KSZ8721SL
Manufacturer Part Number
KSZ8721SL
Description
IC TXRX PHY 10/100 3.3V 48-SSOP
Manufacturer
Micrel Inc
Type
Transceiverr
Datasheet
1.KSZ8721SL.pdf
(35 pages)
Specifications of KSZ8721SL
Number Of Drivers/receivers
1/1
Protocol
IEEE 802
Voltage - Supply
3 V ~ 3.6 V
Mounting Type
Surface Mount
Package / Case
48-SSOP
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
For Use With
576-1630 - BOARD EVALUATION FOR KSZ8721SL
Lead Free Status / RoHS Status
Compliant, Lead free / RoHS Compliant
Other names
576-1031-5
576-1512-5
576-1512-5
KSZ8721SL
576-1512-5
576-1512-5
KSZ8721SL
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Manufacturer
Quantity
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Micrel, Inc.
receive clock is recovered from the line while carrier is active, and operates from the master input clock when the line is
idle. The KS8721BL/SL synchronizes the receive data and control signals on the falling edge of RXC in order to
stabilize the signals at the rising edge of the clock with 10ns setup and hold times.
Transmit Enable
The MAC must assert TXEN at the same time as the first nibble of the preamble, and de-assert TXEN after the last bit
of the packet.
Receive Data Valid
The KS8721BL/SL asserts RXDV when it receives a valid packet. Line operating speed and MII mode will determine
timing changes in the following way:
Error Signals
Whenever the KS8721BL/SL receives an error symbol from the network, it asserts RXER and drives “1110” (4B) on the
RXD pins. When the MAC asserts TXER, the KS8721BL/SL will drive “H” symbols (a Transmit Error defined in the IEEE
802.3 4B/5B code group) out on the line to force signaling errors.
Carrier Sense (CRS)
For 100BASE-TX links, a start-of-stream delimiter, or /J/K symbol pair causes assertion of Carrier Sense (CRS). An
end-of-stream delimiter, or /T/R symbol pair, causes de-assertion of CRS. The PMA layer will also de-assert CRS if
IDLE symbols are received without /T/R, yet in this case RXER will be asserted for one clock cycle when CRS is de-
asserted. For 10BASE-T links, CRS assertion is based on reception of valid preamble, and de-assertion on reception of
an end-of-frame (EOF) marker.
Collision
Whenever the line state is half-duplex and the transmitter and receiver are active at the same time, the KS8721BL/SL
asserts its collision signal, which is asynchronous to any clock.
RMII (Reduced MII) Data Interface
RMII interface specifies a low-pin count, Reduced Media Independent Interface (RMII) intended for use between
Ethernet PHYs and Switch or Repeater ASICs. It is fully compliant with IEEE 802.3u [2].
This interface has the following characteristics:
RMII Signal Definition
June 2009
Signal Name
REF_CLK
CRS_DV
RXD[1:0]
TX_EN
TXD[1:0]
RX_ER
•
•
•
•
•
•
For 100BASE-TX links with the MII in 4B mode, RXDV is asserted from the first nibble of the preamble to the
last nibble of the data packet.
For 10BASE-T links, the entire preamble is truncated. RXDV is asserted with the first nibble of the SFD “5D”
and remains asserted until the end of the packet.
It is capable of supporting 10Mbps and 100Mbps data rates.
A single clock reference is sourced from the MAC to PHY (or from an external source).
It provides independent 2-bit wide (di-bit) transmit and receive data paths.
It uses TTL signal levels compatible with common digital CMOS ASIC processes.
Direction
(w/respect to the PHY)
Input
Input
Output
Output
Input
Output
Input
Direction
(w/respect to the MAC)
Input or Output
Input
Output
Output
Input (Not Required)
13
Carrier Sense/Receive Data Valid
Transmit Enable
Use
Synchronous clock reference for receive, transmit and
control interface
Receive Data
Transmit Data
Receive Error
M9999-062509-1.3
KS8721BL/SL