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MU9C8338-TFI Datasheet(PDF) 9 Page - MUSIC Semiconductors |
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MU9C8338-TFI Datasheet(HTML) 9 Page - MUSIC Semiconductors |
9 / 28 page Functional Description MU9C8338 10/100Mb Ethernet Filter Interface Rev. 1a 9 MAC Address Storage When the MU9C8338 performs an SA processing function, it automatically extracts the MAC address from the packet. The database is searched and the MAC address is added to the LANCAM database if necessary. Similarly, when a DA processing function is performed, the MU9C8338 automatically searches the database for the extracted DA MAC address. It is important that the user is aware of the byte ordering of the 48-bit MAC address when it is stored in the LANCAM database. This is because the user must byte-order MAC addresses identically when a database entry is to be manually added or deleted. Similarly, if the user wishes to read out a MAC address, they should also be aware of the byte ordering when the relevant data registers are read. Throughout this data sheet MAC addresses are shown as bit 47 being the most significant bit, which is placed on the left. Similarly, bit 0 is shown as the least significant bit and placed on the right. Using this notation, the Individual/Group (I/G) bit subfield would be shown as bit 40. This bit would be the first bit of an address transmitted onto the serial network and also the first bit received. The IEEE 802.3 refers to the I/G bit subfield as bit 0. If the bit is set to 1, it indicates that the address is a group address. Conversely, if the bit is set to 0, it indicates it is an individual address. Figure 4 shows a typical 48-bit MAC address used in Ethernet or IEEE 802.3 networks. Figure 4: MAC Address Byte Order If the MAC address shown in Figure 4 is added to the database by the MU9C8338, it is stored as follows: • Segment 3 = 6002h • Segment 2 = 128Ch • Segment 1 = 5634h • Segment 0 = Associated data (permanent bit, time stamp and port ID) If the user wishes to use the built-in routines to manually add, delete, or read MAC addresses from the database, the System CAM Word registers (SCDW) are used as shown in Figure 5. It shows how the MAC address, used as an example in Figure 4, would be transferred using the SCDW registers. If the user intended to delete the MAC address, the SCDW registers would be written as shown in item 1 and the SDO_DELETE routine would be invoked. If the user intended to add the address manually, the SCDW registers would be written as shown in item 2 and the SDO_ADD routine would be invoked. Finally, if the user intended to read an entry, the SDO_READ routine would be invoked and the address would be read from the SCDW registers as shown in item 3. The built-in routines are explained more fully later in this document. Figure 5: SCDW Register Order 02 56 34 12 8C 60 0000 0010 47 40 16 23 24 31 32 39 07 08 15 00 :: : : : IEEE bit 0 I/G bit 6002 assoc. data 5634 128C seg 3 seg 2 seg 1 seg 0 LANCAM Database Entry MAC Address 6002 not used 5634 128C SCDW3 SCDW2 SCDW1 SCDW0 SDO_DELETE SDO_ADD SDO_READ 6002 assoc. data 5634 128C SCDW3 SCDW2 SCDW1 SCDW0 6002 assoc. data 5634 128C SCDW3 SCDW2 SCDW1 SCDW0 3 1 2 |
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