S3C4510B
ETHERNET CONTROLLER
BDMATxCON Register
31
16 15 14 13 12 11 10 9
8
7
6
5
4
0
B
B B B
B B
B
T
x
M
S
L
T
x
E
m
p
t
T
x
T
x
T
x
B B
T
x
T
x
T
x
T
x
C M S
C A T
N N
O L
Reserved
BTxBRST
R E
P
I
I
S
I
I
s
n
N K
E E
y
E C O
[4:0] BDMA Tx burst size (BTxBRST)
(Word size + 1) of data bursts reqested in BDMA mode. If BTxBRST is zero, the burst size is
one word. If BTxBRST is 31, the burst size is 32 words.
[5] BDMA Tx stop/skip frame by owner bit (BTxSTSKO)
0 = Skips the current frame and goes to the next frame descriptor (if BDMA is not the
owner of the frame)
1 = BDMA transmitter generates an interrupt (if enabled).
[6] Reserved
[7] BDMA Tx complete to send control packet interrupt enable (BTxCCPIE)
0 = Disable complete to send control packet interrupt.
1 = Enable complete to send control packet interrupt. (The interrupt is generated when the MAC
completes sending the control packet).
[8] BDMA Tx Null list interrupt enable (BTxNLIE)
0 = Disable transmit Null list interrupt.
1 = Enable Null list interrupt to indicate that BDMATxPTR in the BDMA Tx unit has a Null
address (0x00000000).
[9] BDMA Tx not owner interrupt enable (BTxNOIE)
0 = Disable BDMA Tx not owner interrupt for the current frame.
1 = Enable BDMA Tx not owner interrupt for the current frame (and if the BTxSTSKO bit is set).
[10] BDMA Tx buffer empty interrupt (BTxEmpty)
0 = Disable Tx buffer empty interrupt.
1 = Enable Tx buffer empty interrupt.
[13:11] BDMA transmit to MAC Tx start level (BTxMSL)
000 = No waiting
010 = Wait to fill 2/8 of the Tx buffer
100 = Wait to fill 4/8 of the Tx buffer
001 = Wait to fill 1/8 of the Tx buffer
011 = Wait to fill 3/8 of the Tx buffer
1xx = Wait to fill 4/8 of the Tx buffer
NOTE: Use this formula to calculate transmit time to the MAC Tx FIFO tBtOM:
tBtOM = (BTxMSL/8) * size of the BDMA Tx buffer
[14] BDMA Tx enable (BTxEn)
0 = Disable the BDMA transmitter.
1 = Enable the BDMA transmitter.
[15] BDMA Tx reset (BTxRS)
0 = No effect.
1 = Reset the BDMA Tx block.
Figure 7-12. Buffered DMA Transmit Control Register
7-25
SAMSUNG [ SAMSUNG ]
