adm6993 Infineon Technologies Corporation, adm6993 Datasheet - Page 24

• Manufacturer Part Number: adm6993
• Description: Adm6993/x Hdlc To Fast Ethernet Converter
• Manufacturer: Infineon Technologies Corporation

purpose. These pins are also used for evaluating the default value in the base mode control register (register 0
according to
In order to make these pins with the same Read/Write priority as software, they should be programmed to
11111111
Table 13
Advertis
e all
capabilit
y
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
X
X
X
X
3.3
The ADM6993/X uses a “store & forward” switching approach for the following reason:
Store & forward switches allow switching between different speed media (e.g. 10BaseX and 100BaseX). Such
switches require the large elastic buffer especially bridging between a server on a 100Mbps network and clients
on a 10Mbps segment.
Store & forward switches improve overall network performance by acting as a “network cache”
Store & forward switches prevent the forwarding of corrupted packets by the frame check sequence (FCS) before
forwarding to the destination port.
3.3.1
The ADM6993/X receives incoming packets from one of its ports, searches in the Address Table for the
Destination MAC Address and then forwards the packet to the other port within the same VLAN group, if
appropriate. If the destination address is not found in the address table, the ADM6993/X treats the packet as a
broadcast packet and forwards the packet to the other ports which in the same VLAN group.
Data Sheet
B
Advertis
e single
capabili
ty
0
0
1
1
0
0
1
1
0
1
0
0
1
1
X
X
X
X
X
in case a user wishes to update the advertisement register through software.
Speed Configuration
Switch Functional Description
Basic Operation
Table
13.
Paralle
l detect
follow
IEEE
std.
0
1
0
1
0
1
0
1
X
X
0
1
0
1
X
X
X
X
X
Auto
Negoti-
ation
(Pin &
EEPROM)
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
Speed
(Pin &
EEPROM
)
X
X
X
X
1
1
1
1
1
1
0
0
0
0
0
1
1
0
0
24
Duplex
(Pin &
EEPROM
)
X
X
X
X
1
1
1
1
0
0
1
1
1
1
0
1
0
1
0
Auto
Negot
iation
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
Advertise
Capability
10
0F
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
1
—
—
—
10
0H
1
1
0
0
1
1
0
0
1
1
0
0
0
0
0
—
1
—
—
10
F
1
1
0
0
1
1
0
0
0
0
1
1
1
1
0
—
—
1
—
10
H
1
1
0
0
1
1
0
0
1
0
1
1
0
0
1
—
—
—
1
Function Description
Rev 1.11, 2005-11-28
Parallel Detect
Capability
10
0F
1
0
1
0
1
0
1
0
0
0
0
0
0
0
0
—
—
—
—
ADM6993/X
10
0H
0
1
0
1
0
1
0
1
1
1
0
0
0
0
0
—
—
—
—
10
F
1
0
0
0
1
0
0
0
0
0
1
0
1
0
0
—
—
—
—
10
H
0
1
0
0
0
1
0
0
1
0
0
1
0
1
1
—
—
—
—
H
)