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Bit
Name
Description
7
TX.DMA.START
(Transmit DMA Start) (RfW)
This bit is set by the host to start a DMA transfer.
The DHQll will clear the bit before returning
TX.ACTION.
The bit is cleared by M,ASTER.RESET.
NOTE
After setting this bit, the host must not write to
TBUFFCT, TBUFFAD1, or TBUFFAD2" <7:()i>
until the TX.ACTION report has been returned.
<5:0>
Bits <21:16> of the Dl~A address. Before a DMA
transfer, TBUFFAD 1 and the low byte of
TBUFF AD2 are loaded with the start address of the
DMA buffer. This address will be continuously
changing during a D JMA transfer and has no
meaning. Once TX.ACTION has been returned, the
register contains the final DMA transfer address.
TBUFFAD<21:16>
(Transmit Buffer Address [High])
(RfW)
3.2.2.12 Transmit DMA Buffer Counter (fBUFFCT) TBUFFCT (BASE
15
14
+
13
16)
12
11
10
9
7
8
6
5
4
3
2
o
DMA CHARACTER COUNT
(WHEN VALID HOLDS NO. OF CHARS STILL TO BE SENT)
RO,,79
Bit
Name
Description
< 15:0>
TX.CHAR.CT
This word is loaded with the number of characters to
(Transmit Character Count) (RfW) be transferred by DMA.,
The number of characters is specified as a 16-bit
unsigned integer.
3-20