DM9102AT datasheet(31/77 Pages) ETC

31 / 77 page

DM9102A

Single Chip Fast Ethernet NIC controller

Final

Version: DM9102A-DS-F03

August 28, 2000

15:14

TSB

0,RW

Threshold Bits

These bits are set together with CR6<22> (chose 10Mb or 100Mb) and will decide

the exact FIFO threshold level. The packet transmission will start after the data level

exceeds the threshold value.

Bit15

Bit14

Threshold(100M)

Threshold(10M)

128

256

512

128

Reserved

TXSC

0,RW

Transmit Start/stop Command

When set, transmit process will begin by fetching the transmit descriptor for

available packet data to be transmitted (running state). If the fetched descriptor is

owned by the host, transmit process will enter the suspend state and transmit buffer

unavailable (CR5<2>) is set. Otherwise it will begin to move data from host to

FIFO and transmit out after reaching threshold level.

When reset, transmit process is placed in the stopped state after completing the

transmission of the current frame.

FCM

0,RW

Force Collision Mode

When set, the transmission process is forced to be the collision status. Meaningful

only in the internal loopback mode.

11:10

LBM

0,RW

Loopback Mode

These bits decide two loopback modes besides normal operation. External

loopback mode expects transmitted data back to receive path and makes no

collision detection.

Bit11

Bit10

Loopback Mode

normal

internal loopback

internal PHY digital loopback

internal PHY analog loopback

FDM

0,RW

Full-duplex Mode

This bit is set to make DM9102A operate in the full-duplex mode. Transmit and

receive processes can work simultaneously.

There is no collision detection needed during this mode operation.

Reserved

0,RO

Must be zero.

PAM

0,RW

Pass All Multicast

When set, any packet with a multicast destination address is received by the

DM9102A. The packet with a physical address will also be filtered based on the

filter mode setting.

1,RW

Promiscuous mode

When set, any incoming valid frame is received by the DM9102A, and no matter

what the destination address. The DM9102A is initialized to this mode after reset

operation.

Reserved

0,RO

Must be Zero.

IAFM

0,RO

Inverse Address Filtering Mode

It is set to indicate the DM9102A operate in a Inverse Filtering Mode. This is a read

only bit and mapped from the setup frame together with CR6<2>, CR6<0> setting.

That is, it is valid only during perfect filtering mode.

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