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參數(shù)資料
| 型號(hào)： | S5N8947X |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | MCU for ADSL/Cable Modem |
| 中文描述： | 單片機(jī)為ADSL / Cable Modem的 |
| 文件頁數(shù)： | 29/49頁 |
| 文件大?。?/td> | 407K |
| 代理商： | S5N8947X |
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ELECTRONICS
S5N8947 (ADSL/Cable Modem MCU)
SAMSUNG ELECTRONICS
Page : 29
MagIC Team
6.7. DMA Controller
The S5N8947 has a two-channel general DMA controller, called the GDMA. The two-channel
GDMA performs the following data transfers without CPU intervention:
l
Memory-to-memory (memory to/from memory)
l
UART-to-memory (serial port to/from memory)
l
USB-to-memory (USB port to/from memory)
The on-chip GDMA can be started by software and/or by an external DMA request (nXDREQ).
Software can also be used to restart a GDMA operation after it has been stopped.
The CPU can recognize when a GDMA operation has been completed by software polling and/or
when it receives an appropriate internally generated GDMA interrupt. The S5N8947 GDMA controller
can increment or decrement source or destination addresses and conduct 8-bit (byte), 16-bit (half-word),
or 32-bit (word) data transfers.
System BUS
GDMA Channel 0
nDREQ
nDACK
GDMA Channel 1
nDREQ
nDACK
Port 14 Data
GDMA0
IOPCON [27:26]
nXDACK 0
IOPCON [29:28]
nXDACK 1
Port 15 Data
GDMA1
Mode Selection
Mode Selection
nXDREQ 1
USB
(to Memory)
UART
nXDREQ 0
USB
(from Memory)
Figure 10 GDMA controller block diagram
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| S5N8952X | 制造商:SAMSUNG 制造商全稱:Samsung semiconductor 功能描述:ADSL Transceiver for NIC |
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