SPCA514A 查看數據表（PDF） - Unspecified

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SPCA514A

Digital Audio USB Controller

Unspecified 

SPCA514A

the 8-byte commands in the EP0 FIFO and interrupts the micro-controller. The micro-

controller then read the 8-byte command, decodes it, and prepares the appropriate data

according to the command if necessary. The data, if any, is then sent to the USB bus by

the USB controller.

USB Packet Format

USB Vendor Command for Register Read/Write (for example)

Command bmReqType BRequest wValue WIndex wLength

Read

0C1

0x00

reserved address 1

Write

0x41

0x00

High byte : address 0

reserved

low byte:

write value

USB Bulk-IN Packet Format

The maximum packet size is fixed at 64 bytes. The size of each Bulk-IN packet is

either maximum or zero. The zero-padding is applied to the last packet to make the size

maximum if necessary.

USB Bulk-OUT Packet Format

The maximum packet size is fixed at 64 bytes. The size of each Bulk-OUT packet must

be maximal.

USB Interrupt-IN Packet Format

The maximum packet size is fixed at two bytes. The micro-controller must program the

interrupt pipe registers (both register 0x8506 and 0x8507) after it detects a new event. The

USB controller sends the interrupt data to the host only after register 0x8507 is written.

3.4. Flash Memory

The flash memory is used to store data. The CPU can transfer command, address

and data to the flash memory by the 8-bit I/O port. There are three operation modes for

the CPU to read/write the flash memory: one is the direct mode, another is the FIFO mode

and the other is pseudo DRAM mode. The ECC that is 22-bit code for every 256 bytes will

 



  

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