AX88140AP datasheet(27/46 Pages) ASIX

27 / 46 page

AX88140A

PRELIMINARY

ASIX ELECTRONICS CORPORATION

4.2.10 Serial ROM and MII Management Register (REG9)

The register provides an interface to the Microwire serial ROM and to the physical layer

protocol (PHY). It selects the device and contains both the commands and data to be read from

and stored in the serial ROM.

The MII management selects and operation mode for reading and writing the MII.

FIELD

R/W/C

DESCRIPTION

31:20

Reserved.--Written as “0” for future compatibility concern.

MDI - MII management data_in

Used by the AX88140A to read data from the PHY

R/W

MII - MII management operation mode

Defines the operation mode (read or write) of the PHY.

R/W

MDO - MII Management write data

Specifies the value of the data that AX88140A writes to the PHY

R/W

MDC - MII Management clock

MII management data clock (MII_MDC) is an output signal to the PHY. it is used as a timing

reference.

R/W

RD - Read operation

Read control bit. When set together with REG9<12>, The AX88140A performs read cycles from the

BOOT ROM, and the serial ROM.

13:12

Reserved.--Written as “0” for future compatibility concern.

R/W

SR - SERIAL ROM select

When set together with either SERIAL ROM read operation (REG9<14>) or SERIAL ROM Write

operation (REG9<13>), The AX88140A selects the SERIAL ROM.

10:4

Reserved.--Written as “0” for future compatibility concern.

R/W

SDO - SERIAL ROM data_out

SERIAL ROM data output(SR_DO) From the SERIAL ROM device to the AX88140A.

SDI - SERIAL ROM data_in

SERIAL ROM Data input(SR_DI) To the SERIAL ROM device from the AX88140A.

R/W

SCLK - SERIAL ROM serial clock

Serial clock (SR_CK) Output to the SERIAL ROM.

R/W

SCS - Serial ROM Chip Select

Chip select (sr_cs) output to the serial ROM.

Tab - 25 REG9 Serial ROM, and MII Management Register Description

4.2.11 General -Purpose Timer (REG11)

This register contains a 16 bit general-purpose timer. It is used mainly by the software driver

for timing functions not supplied by the operating system. After the timer is loaded, it starts

counting down . The expiration of the timer causes an interrupt in REG5<11>.

If the timer expires with the CON bit on, the counter will load itself automatically with the last

value. The timer is not active in snooze mode.

Field

R/W/C

Description

31:17

Reserved.--Written as “0” for future compatibility concern.

Continuous operating mode.

R/W

CON - Continuous Mode

One-shot operating mode.

15:0

R/W

Timer value

Contains the general-purpose timer value within a N microsecond cycle.

SRL_10M

: 204.8us

MII_10M

: 819.2us

MII_100M : 81.92us

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