參數(shù)資料
型號： ISP1362
廠商： NXP Semiconductors N.V.
英文描述： Single-chip Universal Serial Bus On-The-Go controller
中文描述： 單芯片通用串行總線和On - The - Go控制器
文件頁數(shù)： 55/150頁
文件大?。?/td> 647K
代理商： ISP1362
Philips Semiconductors
ISP1362
Single-chip USB OTG controller
Product data
Rev. 03
—
06 January 2004
55 of 150
9397 750 12337
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
The following features are supported:
Single-cycle or burst transfers (up to 16 bytes per cycle)
Programmable transfer direction (read or write)
Multiple End-Of-Transfer (EOT) sources: internal conditions, short or empty packet
Programmable signal levels on pins DREQ2 and DACK2.
13.4.1
Selecting an endpoint for the DMA transfer
The target endpoint for DMA access is selected using bits EPDIX[3:0] of the
DcDMACon
fi
guration register, as shown in
Table 17
. The transfer direction (read or
write) is automatically set by the EPDIR bit in the associated ECR, to match the
selected endpoint type (OUT endpoint: read; IN endpoint: write).
Asserting input DACK2 automatically selects the endpoint speci
fi
ed in the
DcDMACon
fi
guration register, regardless of the current endpoint used for the
I/O mode access.
13.4.2
8237 compatible mode
The 8237 compatible DMA mode is selected by clearing the DAKOLY bit of the
DcHardwareCon
fi
guration register (see
Table 114
). The pin functions for this mode
are shown in
Table 18
.
Table 17:
Endpoint
identi
fi
er
Endpoint selection for DMA transfer
EPIDX[3:0]
Transfer direction
EPDIR = 0
OUT: read
OUT: read
OUT: read
OUT: read
OUT: read
OUT: read
OUT: read
OUT: read
OUT: read
OUT: read
OUT: read
OUT: read
OUT: read
OUT: read
EPDIR = 1
IN: write
IN: write
IN: write
IN: write
IN: write
IN: write
IN: write
IN: write
IN: write
IN: write
IN: write
IN: write
IN: write
IN: write
1
2
3
4
5
6
7
8
9
10
11
12
13
14
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Table 18:
Symbol
DREQ2
DACK2
EOT
RD
WR
8237 compatible mode: pin functions
Description
DMA request of DC
DMA acknowledge of DC
end of transfer
read strobe
write strobe
I/O
O
I
I
I
I
Function
DC requests a DMA transfer
DMA controller con
fi
rms the transfer
DMA controller terminates the transfer
instructs the DC to put data on the bus
instructs the DC to get data from the bus
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