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LAN8710A-EZC 데이터시트(PDF) 50 Page - SMSC Corporation |
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LAN8710A-EZC 데이터시트(HTML) 50 Page - SMSC Corporation |
50 / 82 page Small Footprint MII/RMII 10/100 Ethernet Transceiver with HP Auto-MDIX and flexPWR® Technology Datasheet Revision 1.4 (08-23-12) 50 SMSC LAN8710A/LAN8710Ai DATASHEET Chapter 4 Register Descriptions This chapter describes the various control and status registers (CSR’s). All registers follow the IEEE 802.3 (clause 22.2.4) management register set. All functionality and bit definitions comply with these standards. The IEEE 802.3 specified register index (in decimal) is included with each register definition, allowing for addressing of these registers via the Serial Management Interface (SMI) protocol. 4.1 Register Nomenclature Table 4.1 describes the register bit attribute notation used throughout this document. Many of these register bit notations can be combined. Some examples of this are shown below: R/W: Can be written. Will return current setting on a read. R/WAC: Will return current setting on a read. Writing anything clears the bit. Table 4.1 Register Bit Types REGISTER BIT TYPE NOTATION REGISTER BIT DESCRIPTION R Read: A register or bit with this attribute can be read. W Read: A register or bit with this attribute can be written. RO Read only: Read only. Writes have no effect. WO Write only: If a register or bit is write-only, reads will return unspecified data. WC Write One to Clear: writing a one clears the value. Writing a zero has no effect WAC Write Anything to Clear: writing anything clears the value. RC Read to Clear: Contents is cleared after the read. Writes have no effect. LL Latch Low: Clear on read of register. LH Latch High: Clear on read of register. SC Self-Clearing: Contents are self-cleared after the being set. Writes of zero have no effect. Contents can be read. SS Self-Setting: Contents are self-setting after being cleared. Writes of one have no effect. Contents can be read. RO/LH Read Only, Latch High: Bits with this attribute will stay high until the bit is read. After it is read, the bit will either remain high if the high condition remains, or will go low if the high condition has been removed. If the bit has not been read, the bit will remain high regardless of a change to the high condition. This mode is used in some Ethernet PHY registers. NASR Not Affected by Software Reset. The state of NASR bits do not change on assertion of a software reset. RESERVED Reserved Field: Reserved fields must be written with zeros to ensure future compatibility. The value of reserved bits is not guaranteed on a read. |
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