DP83953VUL National Semiconductor, DP83953VUL Datasheet - Page 49

• 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

6.0 Port Block Functions
6.4 Local Ports and Expected Activity
The RIC2A incorporates security options into the repeater.
The configuration of the security features can be performed
globally or on a per port basis. Upon packet reception by
the RIC2A, depending on port configuration, the repeater
will either: transmit the actual data intact to the port, or
transmit pseudo random data to the port during the data
field of the packet.
RIC2A security features can be globally enabled/disabled
during the MLOAD process, or via the RIC2A Configuration
Register bit GSE (global security enable). When GSE is
set, the device will, for all ports, set the port SME (Security
Mode), ESA (Source Address Security), EDA (Destination
Address Security), LME (Learn Mode Enable) bits in the
Port Security Configuration Register (PSCR).
Learning Mode for all the port CAMs can be globally
enabled during the MLOAD process, or via the GLME (Glo-
bal Learn Mode Enable) bit in the Global Security Register
(GSR). When GLME is set, the device will, for all ports, set
the LME (Learn Mode Enable) bit in the PSCR register.
In a multi RIC2A repeater environment, each RIC2A will
get the packet intact over the InterRIC bus (except those
with mismatched source addresses when configured in the
security mode). Each RIC2A will transmit either the real,
intact data or pseudo random data depending on the port
configuration.
Configuration of the Source and Destination Ad-
dress Security Modes
1. Security Mode Disabled
2. Security Mode Enabled
Note: SME: Security Mode bit in the Port Security Configuration Register (PSCR).
RIC2A performs the same repeater operations as the
RIC. The received data is transmitted to all ports, and on
the InterRIC bus.
a. When a port's ESA =0 and,
ESA: Source Address Security bit in the PSCR register.
EDA: Destination Address Security bit in the PSCR register.
SME
0
1
ESA
X
0
1
Table 7. Local Ports and Inter-RIC Bus Data Field Contents
EDA
X
0
1
0
1
(Continued)
X
X
match
match
mismatch
mismatch
match
match
mismatch
match
match
mismatch
of Packet
Address
Source
X
X
match
mismatch
match
mismatch
match
mismatch
X
match
mismatch
X
49
Destination
of Packet
Table 7 describes the types of transmitted data, either
actual or pseudo random data, of each port and over the
Inter-RIC bus. It is assumed that the repeater is powered
up in security mode (GLME=0).
For example, suppose the repeater is in security mode
(SME=1) and configured to perform address comparison
only on destination addresses (ESA=0 and EDA=1). If a
packet is received whose destination address does not
match with that stored address in a designated CAM, then
all the transmitting ports switch to random packet, while the
data is transmitted intact over the Inter-RIC bus. The other
cascaded repeaters will compare the packet’s destination
address with their own internal CAMs for proper decision
making.
Address
b. When a port's ESA=1 and,
i. The port's EDA=0, then the repeater will repeat the
ii. The port's EDA=1, then the repeater will repeat the
i. The port's EDA=0, then on a valid source address
ii. The port's EDA=1, then on a valid source and des-
data on the port, and the Inter-RIC bus.
data on destination address match. On a destina-
tion address mismatch, the repeater will transmit
random data on that port. In both cases, the re-
peater will transmit data on the Inter-RIC bus.
match, the repeater will repeat the data on that
port, and on the Inter-RIC bus. If source address
mismatch occurs, then the repeater will transmit
random data to the port, and on the Inter-RIC bus.
tination address match, the repeater will repeat the
data on the port. If source address matches, but
the destination address does not match, then the
repeater will transmit random data to that port. In
both of these cases, the repeater will repeat the
data on the Inter-RIC bus. When source address
mismatch occurs, then the repeater will transmit
random data to the port and on the Inter-RIC bus.
repeat
repeat
repeat
random
repeat
random
repeat
repeat
random
repeat
random
random
Transmitting
ports
repeat
repeat
repeat
repeat
repeat
repeat
repeat
repeat
random
repeat
repeat
random
Inter-RIC
Bus
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