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參數(shù)資料
| 型號： | TUSB5052B |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | USB to 2-Serial + 1-Parallel Controller With Configurable Optional Hub |
| 中文描述： | USB轉(zhuǎn)2 -串行接口1 -可配置可選并行控制器集線器 |
| 文件頁數(shù)： | 41/84頁 |
| 文件大?。?/td> | 276K |
| 代理商： | TUSB5052B |
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6–1
6 DMA Controller
Table 6–1 outlines the five DMA channels and their associated transfer directions. Four channels are provided for
data transfer between the host and the UARTs. DMA-5 is provided for half-duplex parallel-port transfer (the transfer
direction is defined by the DIR bit in the PPMCR register).
Table 6–1. DMA Channel Allocation
DMA
CHANNEL
TRANSFER
DIRECTION
COMMENTS
DMA-1
Host to UART-1
DMA writes to UART-1 TDR register
DMA-2
Host to UART-2
DMA writes to UART-2 TDR register
DMA-3
UART-1 to host
DMA reads from UART-1 RDR register
DMA-4
UART-2 to host
DMA reads from UART-2 RDR register
DMA-5
Host to/from P-port
DMA reads/writes from/to PPDAT register. Direction is defined by DIR-bit in PPMCR register.
6.1
DMA Controller Registers
Each DMA channel can point to one of seven EDBs (EDB[7:1]) and transfer data to/from a UART channel or the
parallel port. 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.
In 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.
In 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 timeout 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, then stops.
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| TUSB5052PZ | 功能描述:USB 接口集成電路 5port Hub w/Int Brdg to 2-Serial Ports RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
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| TUSB5152 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:USB to 2-Serial 1-Parallel Controller With Configurable Optional Hub |
| TUSB5152PZ | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| TUSB522PEVM | 功能描述:EVAL BOARD FOR TUSB522P 制造商:texas instruments 系列:- 零件狀態(tài):在售 主要用途:接口，信號加強(qiáng)器 嵌入式:- 使用的 IC/零件:TUSB522P 主要屬性:2 通道（雙路） 輔助屬性:LED 狀態(tài)指示器 所含物品:板 標(biāo)準(zhǔn)包裝:1 |
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