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PDF ACD82224 Data sheet ( Hoja de datos )
| Número de pieza | ACD82224 | |
| Descripción | 24 Ports 10/100 Fast Ethernet Switch | |
| Fabricantes | ACD | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de ACD82224 (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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Advanced Communication Devices Corp
ADVANCE INFORMATION
Data Sheet: ACD82224
ACD82224
24 Ports 10/100 Fast Ethernet Switch
Last Update: September 19, 2000
Please check ACD’ s website for update
information before starting a design
Web site: http://www.acdcorp.com
or Contact ACD at:
Email: [email protected]
Tel: 510-354-6810
Fax:510-354-6834
ACD Confidential Material
Use under Non-Disclosure Agreement only. No reproduction or redistribution without ACD’s prior permission.
1 page  
Figure-1.2: ACD82224 Based 24 Ports 3-Chip Managed 10/100 Switch System
PHYs & Transformers & RJ45
Not Populated for ACD82216
16-port System
DRAM
MAG
22-20
MAG
19-16
MAG
15-12
MAG
11-8
MAG
7-4
MAG
3-0
Quad
RMII
PHYs
Quad
RMII
PHYs
4 RMII
Bus
RMII
Bus
3 RMII
Bus
Quad
RMII
PHYs
4 RMII
Bus
RMII Bus
Quad
RMII
PHYs
4 RMII
Bus
Quad
RMII
PHYs
4 RMII
Bus
Quad
RMII
PHYs
4 RMII
Bus
ACD80900
ACD80800 ARL Bus
Optional
ACD82224
LED
Connector
Flash
Crystal
CPU
RS-232
Transceiver
Serial
Interface
Bus Drivers
SRAM BUS
ZBtetTextxSt RAM
100 MHz
OSC
Page 4 of 77
Confidential
Page 4
5 Page 
residue after the polynomial division, is the value of the frame check sequence. This value
should be equal to the FCS field appended at the end of the frame. If the value does not match
the FCS field of the frame, the Frame Bit Error LED of the port will be turned on once and the
packet will be dropped.
Illegal Frame Length & Extra-long Frame
During the receiving process, the MAC will monitor the length of the received frame. Legal
Ethernet frames should have a length of not less than 64 bytes and no more than 1518 bytes. If
the carrier-sense signal (CRS_DV) of a frame is asserted for less than 84 BT, the frame is
flagged with short event error. If the length of a frame is less than 512 BT, the frame is flagged
with runt error.
In order to support an application where extra byte length is required, an Extra long frame option
is provided. When the Extra long frame option is enabled (bit-11 of Register 25), only frames
longer than 1530 bytes are marked with a long event error. Frame length is measured from the
first byte of DA to the last byte of FCS.
Frame Filtering
Frames with any kind of error will be filtered. Error types include CRC, alignment, false carrier
sense, short event, runt, long event and jabber. An error frame will still be displayed on the MIB
interface, along with the error status indication.
Any frame heading to its own source port will be filtered.
When external ARL is used, the filtering decision will be made by the ARL. The ACD82224 will
act in accordance with the ARL’s decision.
If the Spanning Tree Support option (Bit 1 of Register 16) is set, a frame with DA equal to 01-80-
C2-00-00-00 will be forwarded to port-23 (the default CPU port) as a BPDU frame. If Spanning
Tree Support is not enabled, a frame with reserved group address specified in Table-3.5 of the
IEEE802.1d will be treated as a broadcast frame and will be forwarded to all the ports in the
same VLAN of the source port.
Jabber Lockup Protection
If a receiving port is active continuously for more than 50,000 bit times, the port is considered to
be jabbering. A jabbering port will automatically be partitioned from the switch system in order to
prevent it from impairing the performance of the network. The partitioned port will be re-activated
as soon as the offending signal discontinues.
Excessive Collision
In the event that there are more than 16 consecutive collisions, the ACD82224 will reset the
counter to zero and re-transmit the packet. This implementation insures there is no packet loss
even under channel capture situation. However, the ACD82224 has an option to drop the packet
on excessive collisions. When this option is enabled (bit-15 of Register 25), the frame will be
dropped after 16 consecutive collisions.
Page 10 of 77
Confidential
Page 10
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet ACD82224.PDF ] | |
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