參數(shù)資料
型號: M66596FP
元件分類: 總線控制器
英文描述: UNIVERSAL SERIAL BUS CONTROLLER, PQFP64
封裝: 0.50 MM PITCH, LQFP-64
文件頁數(shù): 110/133頁
文件大?。?/td> 1611K
代理商: M66596FP
M66596FP/WG
rev .1.00
2006.3.14
page 76 of 127
3.4 Buffer memory
This chapter explains operation about the buffer memory which this controller contains. When there is no
description, both a Host and Peripheral are the same operation.
3.4.1
Buffer memory allocation
Figure 3.19 shows an example of a buffer memory map for the controller. The buffer memory is an area shared by
the user system control CPU and the controller. In the buffer memory status, there are times when the access right
to the buffer memory is allocated to the user system (CPU side), and times when it is allocated to the controller (SIE
side).
The buffer memory sets independent areas for each pipe. In the memory areas, 64 bytes comprise one block, and
the memory areas are set using the first block number of the number of blocks (specified using the BUFNMB and
BUFSIZE
bits of the PIPEBUF register). Moreover, three FIFO ports are used for access to the buffer memory
(reading and writing data). A pipe is assigned to the FIFO port by specifying the pipe number using the CURPIPE
bit of the C/DxFIFOSEL register.
The buffer statuses of the various pipes can be confirmed using the BSTS bit of the DCPCTR register and
PIPExCTR
register. Also, the access right of the FIFO port can be confirmed using the FRDY bit of the C/DxFIFOCTR
register.
FIFO Port
D0FIFO Port
BUFNMB=0, BUFSIZE=3
CFIFO Port
D1FIFO Port
CURPIPE=1
CURPIPE=3
Buffer memory
PIPEBUF reg
PIPE0
PIPE6
PIPE7
PIPE5
PIPE1
PIPE2
PIPE3
PIPE4
BUFNMB=4, BUFSIZE=0
BUFNMB=5, BUFSIZE=0
BUFNMB=6, BUFSIZE=3
BUFNMB=10, BUFSIZE=7
BUFNMB=18, BUFSIZE=3
BUFNMB=22, BUFSIZE=7
BUFNMB=28, BUFSIZE=2
CURPIPE=6
Figure 3.19 Example of buffer memory map
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