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參數資料
| 型號： | W722 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | Universal Serial Bus (USB) Hub/Compound Device Controller(通用串行總線集線器/混合設備控制器) |
| 中文描述： | 通用串行總線（USB）集線器/復合設備控制器（通用串行總線集線器/混合設備控制器） |
| 文件頁數： | 11/18頁 |
| 文件大小： | 229K |
| 代理商： | W722 |
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I
W722 USB Hub/Compound Device Controller
I
9
Oki Semiconductor
Descriptors
The Descriptors/Status/Register File block includes standard and hub descriptors, hub and port status,
and the register file to store all control and status information.
FIFO Control
The FIFO controller/application interface block:
Manages all first-in/first-out (FIFO) operations for the embedded functions
Provides a parallel read/write interface to the customer’s application
Supports up to eight asynchronous FIFOs (four transmit and four receive).
The FIFOS can be configured as described in the table below.
Endpoint 3 and 7 are two-level FIFOs that support up to two separate data sets of variable sizes. All
FIFOs have flags that detect full and empty conditions and have the capability of retransmitting or re-
receiving the current data set. The FIFO controller logic can be customized to support various FIFO/end-
point requirements.
USB Interface
The W722 connects to the USB via Oki’s USB transceiver. The USB-specific input/output (I/O ) converts
the W722’s internal unidirectional signals into USB-compliant signals. The USB Transceiver allows the
designer’s application module to interface with the physical layer of the USB. By controlling the select
signal, the USB is capable of transmitting and receiving serial data at both full-speed (12 Mbps) and low-
speed (1.5 Mbps) data rates.
FIFO Configuration
FIFO Type
Endpoint Address
Programmable (bytes)
Function
Transmit
0
64
Control transfers
Transmit
5
64
Interrupt and bulk transfers
Transmit
6
64
Interrupt and bulk transfers
Transmit
7
2K
Isochronous, interrupt, and bulk transfers
Receive
0
64
Control transfers
Receive
1
64
Bulk transfers
Receive
2
64
Bulk transfers
Receive
3
2K
Isochronous and bulk transfers
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| W72-43 | 制造商:Olympic Controls Corporation 功能描述: |
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