參數(shù)資料
型號: ISP1161A1BM,557
廠商: NXP SEMICONDUCTORS
元件分類: 總線控制器
英文描述: UNIVERSAL SERIAL BUS CONTROLLER, PQFP64
封裝: 7 X 7 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-414-1, LQFP-64
文件頁數(shù): 137/137頁
文件大?。?/td> 599K
代理商: ISP1161A1BM,557
Philips Semiconductors
ISP1161A1
USB single-chip host and device controller
Product data
Rev. 03 — 23 December 2004
98 of 136
9397 750 13961
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
[1]
Unchanged by a bus reset.
For selecting an endpoint for device DMA transfer, see Section 11.2.
13.1.7
DcDMACounter register (R/W: F3H/F2H)
This command accesses the DcDMACounter register. The bit allocation is given in
Table 88. 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.
Table 86:
DcDMAConguration register: bit allocation
Bit
15
14
13
12
11
10
9
8
Symbol
CNTREN
SHORTP
reserved
ODD_
EVEN_IND
Reset
0
Access
R/W
R
Bit
7
6
5
4
3
2
1
0
Symbol
EPDIX[3:0]
DMAEN
reserved
BURSTL[1:0]
Reset
00
Access
R/W
Table 87:
DcDMAConguration register: bit description
Bit
Symbol
Description
15
CNTREN
A logic 1 enables the generation of an EOT condition, when the
DMA Counter register reaches zero. Bus reset value:
unchanged.
14
SHORTP
A logic 1 enables short/empty packet mode. When receiving
(OUT endpoint) a short/empty packet an EOT condition is
generated. When transmitting (IN endpoint), this bit should be
cleared. Bus reset value: unchanged.
13 to 9
-
reserved
8
ODD_EVEN_
IND
This bit is logic 0 when the last DMA access is a byte (LSB byte
valid; MSB byte invalid). This bit is logic 1 when the last DMA
access is a word (LSB byte valid; MSB byte invalid).
7 to 4
EPDIX[3:0]
Indicates the destination endpoint for DMA, see Table 70.
3
DMAEN
Writing a logic 1 enables DMA transfer, a 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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