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5238-DS03-405-R Datasheet(PDF) 33 Page - Broadcom Corporation.

Part # 5238-DS03-405-R
Description  10/100BASE-TX Octal Transceiver
PDF  76 Pages
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Manufacturer  BOARDCOM [Broadcom Corporation.]
Direct Link  http://www.broadcom.com
Logo BOARDCOM - Broadcom Corporation.

5238-DS03-405-R Datasheet(HTML) 33 Page - Broadcom Corporation.

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Advance Data Sheet
BCM5238
1/31/03
Broa d c om Co rp o r a t i o n
Document
5238-DS03-405-R
MII Management Interface: Register Programming
Page 25
1111 1111 1111 1111 1111 1111 1111 1111
0110 00001 00001 ZZ ZZZZ ZZZZ ZZZZ ZZZZ 1...
For the MII read operation, the BCM5248 drives the MDIO line during the TA and Data fields (the last 17 bit times). A final
65th clock pulse must be sent to close the transaction and cause a write operation to take place.
MII REGISTER MAP SUMMARY
Table 16onpage 26 and Table17onpage 28 contains the MII register map summary for each port of the BCM5248. The
register addresses are specified in hex form, and the name of register bits have been abbreviated. When writing to any
register, preserve existing values of the reserved bits by completing a Read/Modify Write. Ignore reserved bits when reading
registers. Never write to an undefined register. The reset values of the registers are shown in the INIT column. Some of these
values could be different depending on how the device is configured and also depending on the device revision value.



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