BCM43907 Preliminary Data Sheet
Ethernet MAC (MII/RMII) Interface Timing
RMII Receive Packet Timing
Figure 19 and Table 41 provide the RMII receive packet timing.
Figure 19: RMII Receive Packet Timing
REF_CLK
CRS_DV
RXD[1]
RXD[0]
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
1
0
1
0
1
0
1
0
1
1
1
X
X
X
X
X
X
X
X
X
X
X
X
0
0
/J/
/K/
Preamble
SFD
Data
Table 41: RMII Receive Packet Timing
Parameter
Symbol
Minimum Typical
Maximum Unit
REF_CLK Cycle Time
–
–
–
2
20
–
–
ns
ns
RXD[1:0], RXER, CRS_DV Output delay from
REF_CLK rising
10
Notes:
1. In 10 Mbps mode, there are ten REF_CLK periods per data period.
2. The receiver accounts for differences between the local REF_CLK and the recovered clock through use of
sufficient elasticity buffering.
Broadcom®
March 12, 2016 • 43907-DS104-R
Page 101
BROADCOM CONFIDENTIAL
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