s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 247

• Manufacturer Part Number: s3c4510b
• Description: 16/32-bit Risc Microcontroller
• Manufacturer: Samsung Semiconductor, Inc.

S3C4510B
31
[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
NOTE: Use this formula to calculate transmit time to the MAC Tx FIFO tBtOM:
[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.
BDMATxCON Register
tBtOM = (BTxMSL/8) * size of the BDMA Tx buffer
Reserved
Figure 7-12. Buffered DMA Transmit Control Register
16 15 14 13 12 11 10 9 8 7 6 5 4
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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
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ETHERNET CONTROLLER
BTxBRST
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