DP83953VUL National Semiconductor, DP83953VUL Datasheet - Page 42

• Manufacturer Part Number: DP83953VUL
• Description: IC CTRLR RIC REPEATER 160-PQFP
• Manufacturer: National Semiconductor

Specifications of DP83953VUL

• Controller Type: Ethernet Repeater Interface Controller
• Interface: IEEE 802.3
• Voltage - Supply: 4.75 V ~ 5.25 V
• Current - Supply: 870mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 160-MQFP, 160-PQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *DP83953VUL

5.0 HUB MANAGEMENT SUPPORT
Packet Status Register 2
Modified Packet Status Register 5 (MPS=1 in GSR register)
RIC2A provides an option for a new Packet Status Register 5 (PSR5) field. On the seven bytes of management status
field, PSR5 has been modified to indicate the source address mismatch information (SAM bit) for security purposes.
By using this option, the maximum received byte count changes to 2048 (2
ber, it will freeze, instead of rolling over and starting again on the reception of the next packet.
A RUNT bit has also been added to this register indicating whether the last packet received by a port was RUNT. (A
packet is RUNT when its length is greater than or equal to Short Event and less than or equal to 64 bytes from SFD.)
The other registers comprise the remainder of the collision timer register [PSR(3)], the Repeat Byte Count registers
[PSR(4) and PSR(5)], and the Inter Frame Gap Counter "IFG" register [PSR(6)].
D(1:0)
D[7:5]
Bit
D2
D3
D4
D5
D6
D7
Bit
D0
D1
D2
D3
D4
R/W
NA
NA
NA
NA
NA
NA
Symbol
CT(9:8)
ELBER
CRER
NSFD
OWC
resv
D7
SE
JAB
D7
SE
Symbol
RBY10
RUNT
RBY8
RBY9
SAM
resv
Modified Packet Status Register 5 (MPS=1 in GSR register)
OWC
resv
D6
D6
Collision Timer Bits 9 and 8: These two bits are the upper bits of the collision bit timer.
Jabber Event: This bit indicates that the receive packet was long enough to force the
repeater into the jabber protect state.
Elasticity Buffer Error During the packet an Elasticity Buffer underflow or overflow
condition occurred.
Carrier Error Event: The packet suffered sufficient jitter/noise corruption to cause the
PLL decoder to lose lock.
Non SFD: The repeated packet did not contain a Start of Frame Delimiter. When this bit
is set the Repeat Byte Counter counts the length of the entire packet. When this bit is
not set the byte counter only counts post SFD bytes.
Note: The operation of this bit is not inhibited by the occurrence of a collision during packet repetition (see de-
scription of the Repeat Byte Counter below).
Out of Window Collision: The packet suffered an out of window collision.
Short Event: The received activity was so small it met the criteria to be classed as a
short event.
Eighth bit of receive byte count
Ninth bit of receive byte count
Tenth bit of receive byte count
RUNT: A packet whose length is less or equal to 64 bytes from SFD and
greater than or equal to SE length.
0: Last packet received was not a runt
1: Last packet received was a runt
Source Address Mismatch:
0: Source address match occurred for the last packet
1: Source address mismatch occurred for the last packet
Reserved for Future Use: reads as a logic 0
NSFD
resv
D5
D5
(Continued)
PLER
SAM
D4
D4
42
ELBER
RUNT
D3
D3
Description
Description
RBY10
11
JAB
D2
D2
). As soon as the counter reaches this num-
CBT9
RBY9
D1
D1
CBT8
RBY8
D0
D0
www.national.com