5.1.7 Strap Control 0 Register

This register reports the device packet type and the status of the external strap pins, as captured at power-on.
Important: For proper device operation, do not change the value of any bits in this register.
Name: STRAP_CTRL0
Address: 0x12

Bit 15141312111098 
 MITYP[1] 
Access ROROROROROROROR/W 
Reset ----000x 
Bit 76543210 
 MITYP[0]PKGTYP[1:0]SMIADR[4:0] 
Access R/WR/WR/WR/WR/WR/WR/WR/W 
Reset xxxxxxxx 

Bits 8:7 – MITYP[1:0] Media Interface Type - LAN8670 only

In the LAN8670, this field indicates the media interface type as defined by state of the MODE[] configuration strap pins at reset.
Note: This bit field is undetermined in the LAN8671 and LAN8672
ValueDescription
00b Invalid external strap setting.
01b

RMII with 50 MHz REFCLKIN oscillator

MODE[1:0] = 10b
10b

MII with 25 MHz crystal

MODE[1:0] = 01b
11b

Single Clock MII (SC-MII) with 25 MHz crystal

MODE[1:0] = 11b

Bits 6:5 – PKGTYP[1:0] Package Type

This field indicates the product and package type.
ValueDescription
00b Invalid
01b 32-pin LAN8670
10b 24-pin LAN8671with RMII interface
11b 36-pin LAN8672with MII interface

Bits 4:0 – SMIADR[4:0] Serial Management Interface Address

This field indicates the SMI address as defined by the PHYAD[] configuration strap pins at reset.
ValueDescription
xxxxxb Serial Management Interface Address: LAN8670/2
0xxxxb Serial Management Interface Address: LAN8671