SPCA514A 查看數據表（PDF） - Unspecified

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SPCA514A

Digital Audio USB Controller

Unspecified 

SPCA514A

Upload 6 USB

Flash memory The page size of Bulk OUT pipe

flash memory

Pseudo DMA (1)

Upload 8 CPU (0X8300) CPU (0X8300) 64 bytes

Test mode

3.5.2. Upload Mode (1):

When SPCA514A wants to record sound into flash memory, the “OprMode” field in the

register (0X8301) must be set to the value of 0X1. In this mode, the CPU will read and

process the audio data and then write into flash memory by the FIFO mode. The deep of

post buffer is the same as the page size of flash memory in this mode.

3.5.3. Upload Mode (2):

When SPCA514A wants to read data from flash memory and to transfer through the

CPU, for example RS-232 port, the “OprMode” field in the register (0X8301) must be set to

the value of 0X2. In this mode, the CPU will read and process data from flash memory by

the FIFO mode. The deep of post buffer is the same as the page size of flash memory in

this mode.

3.5.4. Upload Mode (3):

When SPCA514A wants to upload data from flash memory to the PC through the USB

bus, the “OprMode” field in the register (0X8301) must be set to the value of 0X3. In this

mode, The data in flash memory will be read by the CPU and written into post buffer by the

pseudo DMA mode (2). The data in the post buffer will be read through the Bulk-IN pipe

by the USB host controller. The deep of post buffer is the same as the page size of flash

memory in this mode.

3.5.5. Upload Mode (4):

When the USB host wants to do loop-back test, the “OprMode” field in the register

(0X8301) must be set to the value of 0X4. The forward path is from the PC through Bulk-

OUT pipe to the CPU and the backward path is from the CPU through Bulk-IN pipe to the

PC. The backward path is supported in this mode and the forward path is supported in

the next mode, Upload Mode (5). The deep of post buffer is 64 bytes in this mode.

 

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