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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)： | 67/84頁 |
| 文件大?。?/td> | 276K |
| 代理商： | TUSB5052B |
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8–7
8.4
Host IN/OUT Transaction From/To P-Port
8.4.1
Host IN Transaction
Figure 8–2 illustrates the data flow for a USB IN transaction (from P-port to host) using the DMA transfer.
The MCU sets the IEDB (input-EDB) with the proper parameters (start-address, byte-count, etc.). In addi-
tion, the MCU sets the DMA and P-port transfer direction. Once initialization has completed, MCU starts
the DMA transfer by setting EN = 1 (DMA is in continuous mode). Initially, the UBM NAKs the host be-
cause the buffer is empty (NAK = 1). Once the DMA completes the 64-byte transfer to the X-Buffer, it up-
dates the byte-count (and sets NAK = 0) in IEDB and switches to the Y-buffer (DMA controls the X/Y-bit).
The UBM starts transmitting the X-Buffer to host and the DMA transfers data from the parallel port to the
Y-Buffer. When the UBM completes the transfer, it sets NAK = 1 indicating to the DMA that the buffer is
ready. This ping-pong transfer continues until the MCU halts the transfer (or times out). If for any reason
the DMA does not transfer a full 64-bytes, it updates the (partial) byte-count value (and sets NAK = 0) in
IEDB, and interrupts the MCU. The UBM uses this count to transfer a partial packet to host. Note: the
DMA increments the byte-count and save it in IEDB at the end of the transfer. On the other hand, the
UBM uses the byte-count from IEDB as the transfer count but does not update the IEDB at the end of the
transfer, i.e., the DMA both increments and updates; the UBM only decrements.
UBM
64 Byte
Y-Buffer
64 Byte
X-Buffer
DMA5
DIR = 1
PPDAT
Host
P-Port
UBM uses the X/Y-bit to
select X/Y-buffers. UBM uses the
byte count in IEDB for the IN
transfer. At the end of transfer
UBM sets NAK = 1
DMA sets the X/Y-bit. At the end of
transfer, DMA updates the IEDB
with the byte count (and NAK = 0)
and toggles the X/Y–bit.
Figure 8–2. USB IN Transaction From P-Port (DMA CNT mode)
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| TUSB5052PZG4 | 功能描述:USB 接口集成電路 5-port Hub with Int Bridge 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 |
| 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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