Datasheet

Micrel, Inc.
KSZ8081MNX/KSZ8081RNB
August
19, 2015 59
Revision 1.4
RMII Timing
Figure 16. RMII Timing – Data Received from RMII
Figure 17. RMII Timing – Data Input to RMII
Table 18. RMII Timing Parameters – KSZ8081RNB (25MHz input to XI pin, 50MHz output from REF_CLK pin)
Timing 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 19. RMII Timing Parameters – KSZ8081RNB (50MHz input to XI pin)
Timing 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