Datasheet

KSZ8081RNA/RND
DS00002199A-page 38  2016 Microchip Technology Inc.
7.0 TIMING DIAGRAMS
7.1 RMII Timing
FIGURE 7-1: RMII TIMING - DATA RECEIVED FROM RMII
FIGURE 7-2: RMII TIMING - DATA INPUT TO RMII
TABLE 7-1: RMII TIMING PARAMETERS (25 MHZ INPUT TO XI PIN, 50 MHZ OUTPUT FROM
REF_CLK PIN)
Parameter Description Min. Typ. Max. Units
t
CYC
Clock cycle — 20 — ns
t
1
Setup time 4 — — ns
t
2
Hold time 2 — — ns
t
OD
Output delay 7 10 13 ns
TABLE 7-2: RMII TIMING PARAMETERS (50 MHZ INPUT TO XI PIN)
Parameter Description Min. Typ. Max. Units
t
CYC
Clock cycle — 20 — ns
t
1
Setup time 4 — — ns
t
2
Hold time 2 — — ns
t
OD
Output delay 8 11 13 ns
t
CYC
REF_CLK
TXEN
TXD[1:0]
t
1
t
2
TRANSMIT TIMING
t
CYC
REF_CLK
CRS_DV
RXD[1:0]
RXER
t
OD
RECEIVE TIMING