參數(shù)資料
型號: TUSB3410VF
英文描述: BUS CONTROLLER
中文描述: 總線控制器
文件頁數(shù): 41/92頁
文件大?。?/td> 317K
代理商: TUSB3410VF
6
1
6 DMA Controller
Table 6
1 outlines the DMA channels and their associated transfer directions. Two channels are provided for data
transfer between the host and the UART.
Table 6
1. DMA Controller Registers
DMA CHANNEL
TRANSFER DIRECTION
COMMENTS
DMA
1
Host to UART
DMA writes to UART TDR register
DMA
3
UART to host
DMA reads from UART RDR register
6.1
DMA Controller Registers
Each DMA channel can point to one of three EDBs (EDB[3:1]) and transfer data to/from the UART channel. The DMA
can move data from a given out-point buffer (defined by EDB) to the destination port. Similarly, the DMA can move
data from a port to a given input-endpoint buffer. Two modes of DMA transfers are supported: burst and continuous.
Burst (CNT = 0) Mode
The DMA stops at the end of a block-data transfer (or if an error condition occurred) and interrupts the MCU.
It is the responsibility of the MCU to update the X/Y bit and the NAK bit in the EDB.
Continuous (CNT = 1) Mode
At the end of a block transfer the DMA updates the byte count and NAK bit in the EDB when receiving. In
addition, it uses the X/Y bit to switch automatically, without interrupting the MCU (the X/Y bit toggle is
performed by the UBM). The DMA stops only when a time-out or error condition occurs. When the DMA is
transmitting (from the X/Y buffer) it continues alternating between X/Y buffers until it detects a byte count
smaller than the buffer size (buffer size is typically 64 bytes). At that point it completes the transfer and stops.
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