MTD800 데이터 시트보기 (PDF) - Myson Century Inc

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MTD800

Integrated Fast Ethernet Controller

Myson Century Inc 

MYSON

TECHNOLOGY

MTD 800

(Preliminary)

4.2.8 Receive Poll Demand Register ( RxPDR )

The RxPDR is used for software driver to command MTD800 to poll the receive descriptor list. This register is

located at an offset address 24H and the access type is WRITE ONLY.

Table 4.16 Receive Poll Demand Register

Bit

31 - 0

Symbol

Description

-

When written with any value, the MTD800 begins to check if any available

descriptor for the reception.

4.2.9 Receive Current Word Pointer ( RxCWP )

The RxCWP allows the driver to read the current address value in the Rx DMA address counter register. This

counter will keep the track of location in the host memory for the last moved-in received word. This register is

useful when operates in the receive early interrupt mode. It must be cleared after hardware or software reset.

The location of RxCWP is at an offset address 28H and the access type is READ ONLY.

Table 4.17 The Content of Receive Current Word Pointer Register

Bit

31- 2

1-0

Symbol

RxCWP

MBZ

Description

Indicates the current word pointer of received word in the host memory.

This field must be zero since the address have to be longword alignment.

4.2.10 Transmit List Base Address ( TxLBA )

The TxLBA stores the base address for the transmit descriptor list. This register is located at an offset address

2CH and the access type is read/writable. The base address is used for MTD800 to point to the start of the

transmit descriptor list. It must be cleared after hardware or software reset and the access type is WRITE

ONLY.

Table 4.18 Transmit List Base Address Register

Bit

31- 2

1-0

Symbol

BA

MBZ

Description

Indicates the base address that points to the start of the transmit list.

This field must be zero since the descriptors have to be longword align-

ment.

4.2.11 Receive List Base Address ( RxLBA )

The RxLBA stores the base address for the receive descriptor list. This register is located at an offset address

30H and the access type is read/writable. The base address is used for MTD800 to point to the start of the

receive descriptor list. It must be cleared after hardware or software reset and the access type is WRITE

ONLY.

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MTD800 Revision 0.0 07/20/1999

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