Sundance Spas ST201 manual Phyctrl, BIT BIT Name

Sundance Technology

ST201

PRELIMINARY draft 2

PHYCTRL
Class	I/O Registers, External Interface Control
Base Address	IoBaseAddress register value
Address Offset	0x5e
Access Mode	Read/Write
Width	8 bits

This register contains control bits for the MII Management Interface. The MII Management Interface is used to access registers in an MII PHY device. The Management Interface is a two-wire serial interface connecting ST201 to any MII-compliant PHY devices residing on the adapter. The host system operates the Management Interface by writing and reading bit patterns to the PhyCtrl register which correspond to the physical waveforms required on the interface signals. For more information on the Management Inter- face signal protocols, refer to the Media Independent Interface standard of IEEE 802.3u Specification.

BIT

0

1

2

3

4

5

6

7

BIT NAME

MgmtClk

MgmtData

MgmtDir

DisableClk25

PhyDuplexPolarity

PhyDuplexStatus

PhySpeedStatus

PhyLinkStatus

BIT DESCRIPTION

The MII Management Clock. This bit drives directly the management clock to the PHY device(s).

The MII Management Data bit. When the MgmtDir bit (below) is set, the value written to this bit is driven onto the MDIO signal. When Mgmt- Dir is cleared, data being driven by the PMD can be read from this bit.

The MII data direction control bit. Setting this bit causes ST201 to drive MDIO with the data bit written into MgmtData.

This bit is set to tri-state the CLK25 pin. DisableClk25 is cleared upon reset.

Clearing this read/write bit will cause the PHYDPLXN input pin to be active low. The default value for this bit upon reset is cleared.

This read-only bit provides a real-time indication of the duplex status of the PHY. This bit is set for full duplex operation.

This read-only bit provides a real-time indication of the speed status of the PHY. This bit is set for 100Mb/s operation.

This read-only bit provides a real-time indication of the twisted-pair transceiver link. This bit is set for operational link (link status up).

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