Datasheet

 2006-2012 Microchip Technology Inc. . DS39662E-page 21
ENC28J60
REGISTER 3-3: MICMD: MII COMMAND REGISTER
U-0 U-0 U-0 U-0 U-0 U-0 R/W-0 R/W-0
— — — — — — MIISCAN MIIRD
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 7-2 Unimplemented: Read as ‘0’
bit 1 MIISCAN: MII Scan Enable bit
1 = PHY register at MIREGADR is continuously read and the data is placed in MIRD
0 = No MII Management scan operation is in progress
bit 0 MIIRD: MII Read Enable bit
1 = PHY register at MIREGADR is read once and the data is placed in MIRD
0 = No MII Management read operation is in progress
REGISTER 3-4: MISTAT: MII STATUS REGISTER
U-0 U-0 U-0 U-0 R-0 R-0 R-0 R-0
— — — — r NVALID SCAN BUSY
bit 7 bit 0
Legend: r = Reserved bit
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 7-4 Unimplemented: Read as ‘0’
bit 3 Reserved: Maintain as ‘0’
bit 2 NVALID: MII Management Read Data Not Valid bit
1 = The contents of MIRD are not valid yet
0 = The MII Management read cycle has completed and MIRD has been updated
bit 1 SCAN: MII Management Scan Operation bit
1 = MII Management scan operation is in progress
0 = No MII Management scan operation is in progress
bit 0 BUSY: MII Management Busy bit
1 = A PHY register is currently being read or written to
0 = The MII Management interface is Idle