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)： 118/150頁
文件大小： 647K
代理商： ISP1362
Philips Semiconductors
ISP1362
Single-chip USB OTG controller
Product data
Rev. 03
—
06 January 2004
118 of 150
9397 750 12337
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
[1]
Unchanged by a bus reset.
16.1.7
DcDMACounter register (R/W: F3H/F2H)
This command accesses the DcDMACounter register, which consists of two bytes.
The bit allocation is given in
Table 120
. Writing to the register sets the number of
bytes for a DMA transfer. Reading the register returns the number of remaining bytes
in the current transfer. A bus reset will not change the programmed bit values.
The internal DMA counter is automatically reloaded from the DcDMACounter register
when DMA is re-enabled (DMAEN = 1). See
Section 16.1.6
for more details.
Code (Hex): F2/F3
—
write or read DcDMACounter register
Transaction
—
write or read 2 bytes (code or data)
Table 118: DcDMACon
fi
guration register: bit allocation
Bit
15
Symbol
CNTREN
Reset
0
[1]
Access
R/W
Bit
7
Symbol
Reset
0
[1]
Access
R/W
14
13
12
11
10
9
8
SHORTP
0
[1]
R/W
6
reserved
-
-
5
-
-
4
-
-
3
-
-
2
-
-
1
-
-
0
EPDIX[3:0]
0
[1]
R/W
DMAEN
0
R/W
reserved
-
-
BURSTL[1:0]
0
[1]
R/W
0
[1]
R/W
0
[1]
R/W
0
[1]
R/W
Table 119: DcDMACon
fi
guration register: bit description
Bit
Symbol
Description
15
CNTREN
Logic 1 enables the generation of an EOT condition, when the
DcDMACounter register reaches zero. Bus reset value:
unchanged.
14
SHORTP
Logic 1 enables the short or empty packet mode. When
receiving (OUT endpoint) a short or empty packet, an EOT
condition is generated. When transmitting (IN endpoint), this bit
should be cleared. Bus reset value: unchanged.
13 to 8
-
reserved
7 to 4
EPDIX[3:0]
Indicates the destination endpoint for DMA, see
Table 17
.
3
DMAEN
Writing logic 1 enables DMA transfer, logic 0 forces the end of
an ongoing DMA transfer. Reading this bit indicates whether
DMA is enabled (0 = DMA stopped; 1 = DMA enabled). This bit
is cleared by a bus reset.
2
-
reserved
1 to 0
BURSTL[1:0]
Selects the DMA burst length:
00
—
single-cycle mode (1 byte)
01
—
burst mode (4 bytes)
10
—
burst mode (8 bytes)
11
—
burst mode (16 bytes)
Bus reset value: unchanged.
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