E T H E R N E T C O M M U N I C A T I O N M O D U L E

Transmit packet processor

Transmit buffer descriptor format

reside in different buffers in system memory, several buffer descriptors can be used to transfer the frame.

All buffer descriptors (that is, up to 64) are found in a local TX buffer descriptor RAM. This is the transmit buffer descriptor format.

 

31

30

29

28

 

16

15

 

 

0

OFFSET + 0

 

 

 

 

Source Address

 

 

 

 

 

 

 

 

 

 

 

 

 

OFFSET + 4

 

 

 

 

Buffer Length (11-bits used)

 

 

OFFSET + 8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Destination Address (not used)

 

 

OFFSET + C

 

 

 

 

 

 

 

 

 

 

W

I

L

F

Reserved

 

 

Status

 

 

 

 

 

 

 

 

 

 

 

Transmit buffer

descriptor field

Field

Description

definitions

 

 

W

WRAP bit, which, when set, tells the TX_WR logic that this is the last buffer descriptor

 

 

 

within the continuous list of descriptors in the TX buffer descriptor RAM. The next

 

 

buffer descriptor is found using the initial buffer descriptor pointer in the TX Buffer

 

 

Descriptor Pointer register (TXPTR).

 

 

When the WRAP bit is not set, the next buffer descriptor is located at the next entry

 

 

in the TX buffer descriptor RAM.

 

 

 

 

I

When set, tells the TX_WR logic to set TXBUFC in the Ethernet Interrupt Status

 

 

register when the buffer is closed due to a normal channel completion.

 

 

 

 

Buffer pointer

32-bit pointer to the start of the buffer in system memory. This pointer can be aligned

 

 

on any byte of a 32-bit word.

 

 

 

 

Status

Lower 16 bits of the Ethernet Transmit Status register. The status is returned from

 

 

the Ethernet MAC at the end of the frame and written into the last buffer descriptor

 

 

of the frame.

 

 

 

 

L

When set, tells the TX_WR logic that this buffer descriptor is the last descriptor that

 

 

completes an entire frame. This bit allows multiple descriptors to be chained together

 

 

to make up a frame.

270Hardware Reference NS9215

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Digi NS9215 manual Transmit buffer descriptor format, Transmit buffer Descriptor field, Definitions

NS9215 specifications

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