TSB42AA4 Datasheet, PDF(138/183 Page) Texas Instruments – IEEE 1394 A CONSUMER ELECTRONICS LINK LAYER CONTROLLER

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TSB42AA4 Datasheet, PDF (138/183 Pages) Texas Instruments – IEEE 1394 A CONSUMER ELECTRONICS LINK LAYER CONTROLLER

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0x144 DBSTAT0 â Data Buffer Status 0 (continued)

BIT

NAME

TYPE RESET

FUNCTION

7:5 RSVD

0 Reserved â A write to this location has no effect. A read returns 0s.

4 BUF0WM1

0 Buffer 0 watermark 1 â This bit is set by hardware to indicate that the

number of quadlets in the associated buffer has risen above or fallen

below the value in DB0CFG3.WATERMARK1, depending on the

setting of DB0CFG0.WM1CTL.

3 BUF0WM0

1 Buffer 0 watermark 0 â This bit is set by hardware to indicate that the

number of quadlets in the associated buffer has risen above or fallen

below the value in DB0CFG3.WATERMARK0, depending on the

setting of DB0CFG0.WM0CTL.

2 BUF0LCELLAV RU

0 Buffer 0 logical cell available â When set to 1, a logical cell has been

received and confirmed into a receive buffer.

1 BUF0FULL

0 Buffer 0 full â When set to 1, indicates that there is no space available

in the current buffer. Software cannot write to this buffer when this bit is

set.

0 BUF0EMPTY

1 Buffer 0 empty â When set to 1, indicates that there is no data in the

current buffer. Software cannot read from this buffer when this bit is

set.

0x148 DBSTAT1 â Data Buffer Status 1

BIT

NAME

TYPE RESET

FUNCTION

31:29 RSVD

0 Reserved â A write to this location has no effect. A read returns 0s.

28 BUF7WM1

0 Buffer 7 watermark 1 â This bit is set by hardware to indicate that the

number of quadlets in the associated buffer has risen above or fallen

below the value in DB7CFG3.WATERMARK1, depending on the

setting of DB7CFG0.WM1CTL.

27 BUF7WM0

1 Buffer 7 watermark 0 â This bit is set by hardware to indicate that the

number of quadlets in the associated buffer has risen above or fallen

below the value in DB7CFG3.WATERMARK0, depending on the

setting of DB7CFG0.WM0CTL.

26 BUF7LCELLAV

0 Buffer 7 logical cell available â When set to 1, a logical cell has been

received and confirmed into a receive buffer.

25 BUF7FULL

0 Buffer 7 full â When set to 1, indicates that there is no space available

in the current buffer. Software cannot write to this buffer when this bit

is set to 1.

6â41

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