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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)： | 47/84頁 |
| 文件大?。?/td> | 276K |
| 代理商： | TUSB5052B |
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6–7
6.1.6
DMACSR5: DMA-5 Control and Status Register (P-Port Channel)
This register is used to define the transaction time-out value. In addition, it contains a completion code that reports
any errors or a time-out condition.
TEN
C4
C3
C2
C1
C0
TXFT
PPKT
7
6
5
4
3
2
1
0
R/W
R/W
R/W
R/W
R/W
R/W
R/C
R/C
BIT
0
NAME
PPKT
RESET
0
FUNCTION
Partial packet condition bit. This bit is set by the DMA and cleared by the MCU (see Table 6–2).
PPKT = 0
No partial-packet condition
PPKT = 1
Partial-packet condition detected. Clears when MCU writes a 1. Writing a 0 has no effect.
1
TXFT
0
Transfer Timeout Condition Bit (see Table 6–2 and Table 6–3)
TXFT = 0
DMA stopped transfer without time-out
TXFT = 1
DMA stopped due to transaction time-out. Clears when MCU writes a 1. Writing a 0 has no effect.
6-2
C[4:0]
0000b
This field is used to define the transaction time-out value in 1ms increments. This value is loaded to a down
counter every time a byte transfer occurs. The down counter is decremented every SOF pulse (1 ms). If the
counter decrements to zero it sets TXFT = 1 (in DMACSR register) and halts the DMA transfer.
For OUT transaction:
The counter starts counting only when TEN = 1 and EN = 1 (in DMACDR) and the first
byte has been transmitted by the DMA.
For IN transaction
: The counter starts counting only when TEN = 1 and EN = 1 (in DMACDR) and the first byte
has been received by DMA (see Figure 6–1).
00000 = 0 ms time-out
:
:
11111 = 31 ms time-out
7
TEN
0
Transaction timeout counter enable/disable bit
TEN = 0 Counter is disabled (does nottime out).
TEN = 1 Counter is enabled.
6.2
Bulk Data I/O Using the EDB
The UBM (USB buffer manager) and the DMAC (DMA controller) access the EDB to fetch buffer parameters for IN
and OUT transactions (IN and OUT are with respect to host). In this discussion, it is assumed that (a) the MCU
initialized the EDBs, (b) DMA-continuous mode is being used, (c) double buffering is being used, and (d) the X/Y
toggle is controlled by the UBM.
NOTE:
The IN and OUT transfers apply to UART and P-port transactions (SPP, EPP and ECP
modes).
IN Transaction (TUSB5152 to Host):
1.
MCU initializes the IEDB (64-byte packet, and double-buffering is used) and the following DMA registers:
DMACSR: Defines the transaction time-out value.
DMACDR: Defines the IEDB being used and the DMA mode of operation (continuous-mode). Once this
register is set with EN = 1, the transfer starts.
2.
DMA transfers data from a device (UART or P-port) to the X-buffer. When a block of 64-bytes is transferred,
the DMA updates the byte-count and sets NAK = 0 in IEDB (indicating to the UBM that the X-buffer is ready
to be transferred to host). The UBM starts X-buffer transfer to host using the byte-count value in IEDB and
toggles the X/Y-bit. The DMA continues transferring data from a device to Y-buffer. At the end of the block
transfer, the DMA updates the byte-count and sets NAK = 0 in IEDB (indicating to the UBM that the Y-buffer
is ready to be transferred to host). The DMA continues the transfer from the device to host, alternating
between X and Y buffers without MCU intervention.
3.
Transfer termination: As mentioned, the DMA/UBM continues the data transfer, alternating between the X
and Y buffers. Termination of the transfer can happen under the following conditions:
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相關(guān)代理商/技術(shù)參數(shù) |
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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 標準包裝:1 |
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