KS8721SL-EVAL Micrel Inc, KS8721SL-EVAL Datasheet - Page 28

• Manufacturer Part Number: KS8721SL-EVAL
• Description: BOARD EVAL EXPERIMENT KS8721SL
• Manufacturer: Micrel Inc

Specifications of KS8721SL-EVAL

• Main Purpose: Interface, Ethernet Controller (PHY and MAC)
• Embedded: No
• Utilized Ic / Part: KSZ8721SL
• Primary Attributes: 1 Port, 100BASE-TX/100BASE-FX/10BASE-T
• Secondary Attributes: MII, RMII, Auto MDI, MDIX, >130 Meter Cable Driver, LDO, IEEE802.3u Compliant
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 576-1010

KS8721BL/SL (3.3V Single Power Supply 10/100BaseTX/FX MII Physical Layer Transceiver)
RX_ER
The PHY shall provide RX_ER as an output according to the rules specified
in IEEE 802.3u [2] (see Clause 24, Figure 24-11 - Receive State Diagram).
RX_ER shall be asserted for one or more REF_CLK periods to indicate that
an error (e.g. a coding error or any error that a PHY is capable of detecting,
and that may otherwise be undetectable by the MAC sublayer) was
detected somewhere in the frame presently being transferred from the PHY.
RX_ER shall transition synchronously with respect to REF_CLK. While
CRS_DV is de-asserted, RX_ER shall have no effect on the MAC.
RMII AC Characteristics
Symbol
Thold
Tsu
REF_CLK
Frequency
REF_CLK Duty
Cycle
TXD[1:0],
TX_EN,
RXD[1:0],
CRS_DV, RX_ER
Data Setup to
REF_CLK rising
edge
TXD[1:0],
TX_EN,
RXD[1:0],
CRS_DV, RXER
Data hold from
REF_CLK rising
edge
Parameter
Min
- 28 -
35
4
2
Typ
50
KS8721BL/SL Preliminary Rev 0.90
Max
65
Units
MHz
%
ns
ns
Aug, 2003