W712 Datasheet, PDF(9/17 Page) OKI electronic componets – Universal Serial Bus Controller 0.5uM Technology Mega Macrofunction

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W712 Datasheet, PDF (9/17 Pages) OKI electronic componets – Universal Serial Bus Controller 0.5uM Technology Mega Macrofunction

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FUNCTIONAL DESCRIPTION

The W712 controller consists of two submodules, the Z712a hard macro, and the W712b soft macro, each

containing multiple function blocks. The Z712a includes the Protocol Engine, DPLL, and Timer Blocks.

The W712b includes the Status/Control, FIFO Control, Application Interface, Frame Timer Synthesizer,

and remote wakeup blocks.

Protocol Engine

The Protocol Engine handles the USB communication protocol. It performs packet sequencing, signal

generation/detection, CRC generation/checking, NRZI data encoding, bit-stuffing and packet ID (PID)

generation/decoding.

DPLL

The Digital Phase Locked Loop extracts the clock and data from the USB differential received data.

Timer

The Timer block monitors idle time on the USB bus.

Status/Control

The Status/Control block uses transfer type and FIFO state information to manage the reception and

transmission of USB data. It monitors the transaction status and communicates control events to the appli-

cation via the Application Interface.

FIFO Control

The FIFO control block manages all FIFO operations for transmitting and receiving USB data sets. The

W712 supports eight FIFOs (four transmit and four receive). They can be configured as described in the

table below.

FIFO Configuration

FIFO Type

Transmit

Receive

Endpoint Address

Programmable

64 bytes

2 Kbytes

64 bytes

2 Kbytes

Function

Control Transfers

Interrupt and Bulk Transfers

Isochronous, Interrupt, and Bulk Transfers

Control Transfers

Bulk Transfers

Isochronous and Bulk Transfers

Endpoints 3 and 7 are 2-level FIFOs which support up to two separate data sets of variable sizes. All FIFOs

have flags that detect a full or empty FIFO and have the capability of re-transmitting or re-receiving the

current data set.

Oki Semiconductor

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