dp83846a National Semiconductor Corporation, dp83846a Datasheet - Page 39

• Manufacturer Part Number: dp83846a
• Description: Dsphyter ? Single 10/100 Ethernet Transceiver
• Manufacturer: National Semiconductor Corporation

This counter provides information required to implement the “FalseCarriers” attribute within the MAU managed object
class of Clause 30 of the IEEE 802.3u specification.
This counter provides information required to implement the “SymbolErrorDuringCarrier” attribute within the PHY man-
aged object class of Clause 30 of the IEEE 802.3u specification.
15:13
15:8
15:8
7:0
7:0
Bit
Bit
Bit
12
11
10
9
8
SD FORCE PMA
RXERCNT[7:0]
FCSCNT[7:0]
Table 19. 100 Mb/s PCS Configuration and Status Register (PCSR), address 0x16
SD_OPTION
RESERVED
RESERVED
RESERVED
FREE_CLK
BYP_4B5B
Bit Name
Bit Name
Bit Name
TQ_EN
Table 17. False Carrier Sense Counter Register (FCSCR), address 0x14
Table 18. Receiver Error Counter Register (RECR), address 0x15
0, RW / COR
0, RW / COR
<00>, RO
Default
Default
Default
0,
0, RW
0, RW
0
1, RW
0, RO
0, RO
, RW
RW
RESERVED: Writes ignored, Read as 0
False Carrier Event Counter:
This 8-bit counter increments on every false carrier event. This
counter sticks when it reaches its max count (FFh).
RESERVED: Writes ignored, Read as 0
RX_ER Counter:
This 8-bit counter increments for each receive error detected.
When a valid carrier is present and there is at least one occurrence
of an invalid data symbol. This event can increment only once per
valid carrier event. If a collision is present, the attribute will not in-
crement. The counter sticks when it reaches its max count.
RESERVED: Writes ignored, Read as 0.
Bypass 4B/5B Encoding:
1 = 4B5B encoder functions bypassed.
0 = Normal 4B5B operation.
Receive Clock:
1 = RX_CK is free-running.
0 = RX_CK phase adjusted based on alignment.
100Mbs True Quiet Mode Enable:
1 = Transmit True Quiet Mode.
0 = Normal Transmit Mode.
Signal Detect Force PMA:
1 = Forces Signal Detection in PMA.
0 = Normal SD operation.
Signal Detect Option:
1 = Enhanced signal detect algorithm.
0 = Reduced signal detect algorithm.
39
Description
Description
Description
www.national.com