s3c4510b Samsung Semiconductor, Inc., s3c4510b Datasheet - Page 235

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

S3C4510B
BUFFERED DMA INTERFACE
BUFFERED DMA (BDMA) CONTROL BLOCKS
The BDMA engine controls a transmit buffer and a receive buffer. The BDMA transmit buffer holds data and
status information for packets being transmitted. The BDMA receive buffer holds data and status information for
packets being received. Each FIFO has a control block which controls data being placed in, and removed from,
the buffers.
I/F
M
U
S
Y
S
T
E
B
S
SD[31:0]
SA[25:0]
nREQ
nACK
Target Address
Half_empty
for Rx
Generator
Source Address
Address
Arbiter
BUS
Half_full
for Tx
nREQ_Tx
nREQ_Rx
RX_over flow
Tx_Underflow
Request
Request
Rx Bus
Rx Bus
Figure 7-5. BDMA Control Blocks
-
-
Rx_Widget
Tx widget
HEAD Ptr
HEAD Ptr
TAIL Ptr
TAIL Ptr
Big/little
SD [31:0]
Word-to-Byte
Byte-to-Word
Converter
Converter
(32 x 64)
(33 x 64)
BDMA
BDMA
Buffer
Buffer
Rx
Tx
Data Swapper
Machine
Machine
Control
Control
Rx
Tx
ETHERNET CONTROLLER
Half_empty
Rx_DB[7:0]
Tx_DB[7:0]
Half_full
Big/Little
Rx_rdy
Tx_rdy
Rx_clk
Tx_clk
Tx_wr
Rx_rd
I/F
M
D
D
B
B
A
7-13
I