參數(shù)資料
型號(hào): AT85C51SND3B1-RTTUL
廠商: Atmel
文件頁(yè)數(shù): 110/119頁(yè)
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(pán)
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)第41頁(yè)第42頁(yè)第43頁(yè)第44頁(yè)第45頁(yè)第46頁(yè)第47頁(yè)第48頁(yè)第49頁(yè)第50頁(yè)第51頁(yè)第52頁(yè)第53頁(yè)第54頁(yè)第55頁(yè)第56頁(yè)第57頁(yè)第58頁(yè)第59頁(yè)第60頁(yè)第61頁(yè)第62頁(yè)第63頁(yè)第64頁(yè)第65頁(yè)第66頁(yè)第67頁(yè)第68頁(yè)第69頁(yè)第70頁(yè)第71頁(yè)第72頁(yè)第73頁(yè)第74頁(yè)第75頁(yè)第76頁(yè)第77頁(yè)第78頁(yè)第79頁(yè)第80頁(yè)第81頁(yè)第82頁(yè)第83頁(yè)第84頁(yè)第85頁(yè)第86頁(yè)第87頁(yè)第88頁(yè)第89頁(yè)第90頁(yè)第91頁(yè)第92頁(yè)第93頁(yè)第94頁(yè)第95頁(yè)第96頁(yè)第97頁(yè)第98頁(yè)第99頁(yè)第100頁(yè)第101頁(yè)第102頁(yè)第103頁(yè)第104頁(yè)第105頁(yè)第106頁(yè)第107頁(yè)第108頁(yè)第109頁(yè)當(dāng)前第110頁(yè)第111頁(yè)第112頁(yè)第113頁(yè)第114頁(yè)第115頁(yè)第116頁(yè)第117頁(yè)第118頁(yè)第119頁(yè)
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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