參數(shù)資料
型號(hào): AT85C51SND3B1-RTTUL
廠商: Atmel
文件頁數(shù): 110/119頁
文件大?。?/td> 0K
描述: IC DECODER/ENCODER DGTL 100-LQFP
標(biāo)準(zhǔn)包裝: 90
類型: 音頻編碼器/解碼器
應(yīng)用: 移動(dòng)電話,手機(jī),視頻顯示器
電壓 - 電源,數(shù)字: 1.65 V ~ 3.6 V
安裝類型: 表面貼裝
封裝/外殼: 100-LQFP
供應(yīng)商設(shè)備封裝: 100-LQFP(14x14)
包裝: 托盤
90
AT85C51SND3B
7632D–MP3–01/07
When using this mode, there is no influence over the USB controller.
Memory Management
The controller only supports the following memory allocation management:
The reservation of a Pipe or an Endpoint can only be made in the growing order
(Pipe/Endpoint 0 to the last Pipe/Endpoint). The firmware shall thus configure them in
the same order.
The reservation of a Pipe or an Endpoint “ki” is done when its ALLOC bit is set. Then,
the hardware allocates the memory and insert it between the Pipe/Endpoints “ki-1” and
“ki+1”. The “ki+1” Pipe/Endpoint memory “slides” up and its data is lost. Note that the “ki+2
and upper Pipe/Endpoint memory does not slide.
Clearing a Pipe enable (PEN) or an Endpoint enable (EPEN) does not clear neither its
ALLOC bit, nor its configuration (EPSIZE/PSIZE, EPBK/PBK). To free its memory, the
firmware should clear ALLOC. Then, the “ki+1” Pipe/Endpoint memory automatically
“slides” down. Note that the “ki+2” and upper Pipe/Endpoint memory does not slide.
The following figure illustrates the allocation and reorganization of the USB memory in a
typical example:
Figure 54. Allocation and reorganization USB memory flow
Endpoint 0
Endpoint 1 to N
Unused
[DPADDH
DPADDL]
USB DPRAM
Free m em ory
0
1
2
3
4
5
EPEN=1
ALLOC=1
Free m em ory
0
1
2
4
5
EPEN=0
(ALLOC=1)
Free m em ory
0
1
2
4
5
Pipe/Endpoints
activation
Pipe/Endpoint
Disable
Free its m em ory
(ALLOC=0)
Free m em ory
0
1
2
3 (bigger size)
5
Pipe/Endpoint
Activatation
Lost m em ory
4
Conflict
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