ADM7008
Function Description
de-asserted, CRSDV_P is de-asserted synchronously to REFCLK.
REFCLK
CRSDV
00
00
00
00
00
00
01
01
01
01
01
11 Data Data
Data Data Data Data Data Data Data 00
00
00
RXD
RXER
Carrier Sense
Detected
Carrier
Deasserted
Preamble
SFD
Data
Figure 3-5 RMII Reception Without Error
REFCLK
CRSDV_P
RXD_P
00
00
00
00
10
11
10
11
10
11
10
11
10
11
10
00
00
00
00
00
00
00
00
00
RXER_P
Carrier Sense
Detected
Carrier
Deasserted
False Carrier
Detected
False Carrier
Figure 3-6 RMII Reception with False Carrier (100M Only)
A receive symbol error event is shown in Figure 3-7. The packet with the symbol error is
treated as if it were a valid packet with the exception that all di-bits are substituted with
the (01) pattern.
REFCLK
CRSDV_P
00
00
00
00
00
00
01
01
Data Data 01
01
01
01
01
01
01
01
01
01
01
00
00
00
RXD_P
RXER_P
Carrier Sense
Detected
RX Error
Detected
Carrier
Deasserted
Error Data
Figure 3-7 RMII Reception with Symbol Error
ADMtek Inc.
3-15
ETC [ ETC ]
