LAN9353 Datasheet, PDF (155/523 Pages) Microchip Technology – Interfaces at up to 200Mbps via Turbo MII

LAN9353
TABLE 9-19: MMD REGISTERS (CONTINUED)
MMD DEVICE
ADDRESS
(IN DECIMAL)
INDEX
(IN DECIMAL)
REGISTER NAME
2
PHY x Vendor Specific MMD 1 Device ID 1 Register
(PHY_VEND_SPEC_MMD1_DEVID1_x)
3
PHY x Vendor Specific MMD 1 Device ID 2 Register
(PHY_VEND_SPEC_MMD1_DEVID2_x)
5
PHY x Vendor Specific MMD 1 Devices Present 1 Register
(PHY_VEND_SPEC_MMD1_PRESENT1_x)
30
(Vendor Specific)
6
PHY x Vendor Specific MMD 1 Devices Present 2 Register
(PHY_VEND_SPEC_MMD1_PRESENT2_x)
8
PHY x Vendor Specific MMD 1 Status Register
(PHY_VEND_SPEC_MMD1_STAT_x)
14
PHY x Vendor Specific MMD 1 Package ID 1 Register
(PHY_VEND_SPEC_MMD1_PKG_ID1_x)
15
PHY x Vendor Specific MMD 1 package ID 2 Register
(PHY_VEND_SPEC_MMD1_PKG_ID2_x)
To read or write an MMD register, the following procedure must be observed:
1. Write the PHY x MMD Access Control Register (PHY_MMD_ACCESS) with 00b (address) for the MMD Function
field and the desired MMD device (3 for PCS, 7 for Auto-Negotiation) for the MMD Device Address (DEVAD) field.
2. Write the PHY x MMD Access Address/Data Register (PHY_MMD_ADDR_DATA) with the 16-bit address of the
desired MMD register to read/write within the previously selected MMD device (PCS or Auto-Negotiation).
3. Write the PHY x MMD Access Control Register (PHY_MMD_ACCESS) with 01b (data) for the MMD Function
field and choose the previously selected MMD device (3 for PCS, 7 for Auto-Negotiation) for the MMD Device
Address (DEVAD) field.
4. If reading, read the PHY x MMD Access Address/Data Register (PHY_MMD_ADDR_DATA), which contains the
selected MMD register contents. If writing, write the PHY x MMD Access Address/Data Register (PHY_M-
MD_ADDR_DATA) with the register contents intended for the previously selected MMD register.
Unless otherwise specified, reserved fields must be written with zeros if the register is written.
 2015 Microchip Technology Inc.
DS00001925A-page 155