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| 型號： | ISP1183 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Low-power Universal Serial Bus interface device with DMA |
| 中文描述： | 低功耗通用串行總線與DMA接口設(shè)備 |
| 文件頁數(shù)： | 17/62頁 |
| 文件大小： | 295K |
| 代理商： | ISP1183 |
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Philips Semiconductors
ISP1183
Low-power USB interface device with DMA
Product data
Rev. 01 — 24 February 2004
17 of 62
9397 750 11804
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
11. DMA transfer
Direct Memory Access (DMA) is a method to transfer data from one location to
another in a computer system, without intervention of the central processor unit
(CPU). Many implementations of DMA exist. The ISP1183 supports two methods:
8237 compatible mode
: based on the DMA subsystem of the IBM
personal
computers (PC, AT and all its successors and clones); this architecture uses the
Intel
8237 DMA controller and has separate address spaces for memory and I/O
DACK-only mode
: based on the DMA implementation in some embedded RISC
processors, which has a single address space for both memory and I/O.
The ISP1183 supports DMA transfer for all 14 configurable endpoints (see
Table 4
).
Only one endpoint can be selected at a time for DMA transfer. The DMA operation of
the ISP1183 can be interleaved with normal I/O mode access to other endpoints.
The following features are supported:
Single-cycle or burst transfers (up to 16 bytes per cycle)
Programmable transfer direction (read or write)
Programmable signal levels on pins DREQ and DACK.
11.1 Selecting an endpoint for DMA transfer
The target endpoint for DMA access is selected through bits EPDIX[3:0] in the DMA
Configuration register, see
Table 7
. The transfer direction (read or write) is
automatically set by bit EPDIR in the associated ECR, to match the selected endpoint
type (OUT endpoint: read; IN endpoint: write).
Asserting input DACK automatically selects the endpoint specified in the DMA
Configuration register, regardless of the current endpoint used for I/O mode access.
Table 7:
Endpoint
identifier
Endpoint selection for DMA transfer
EPDIX[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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ISP1183BS | 功能描述:IC USB HOST CTRL LOW-SPD 32HVQFN RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 應(yīng)用:PDA，便攜式音頻/視頻，智能電話 接口:I²C，2 線串口 電源電壓:1.65 V ~ 3.6 V 封裝/外殼:24-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) 安裝類型:表面貼裝 產(chǎn)品目錄頁面:1015 (CN2011-ZH PDF) 其它名稱:296-25223-2 |
| ISP1183BS,118 | 功能描述:USB 接口集成電路 FULL-SPD USB2 DEVICE RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| ISP1183BS,151 | 功能描述:USB 接口集成電路 FULL-SPD USB2 DEVICE RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| ISP1183BS,157 | 功能描述:USB 接口集成電路 DO NOT USE ORDER -S OR -T PART RoHS:否 制造商:Cypress Semiconductor 產(chǎn)品:USB 2.0 數(shù)據(jù)速率: 接口類型:SPI 工作電源電壓:3.15 V to 3.45 V 工作電源電流: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| ISP1183BSFA | 功能描述:IC USB HOST CTRL LOW-SPD 32HVQFN RoHS:是 類別:集成電路 (IC) >> 接口 - 專用 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 應(yīng)用:PDA，便攜式音頻/視頻，智能電話 接口:I²C，2 線串口 電源電壓:1.65 V ~ 3.6 V 封裝/外殼:24-WQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:24-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) 安裝類型:表面貼裝 產(chǎn)品目錄頁面:1015 (CN2011-ZH PDF) 其它名稱:296-25223-2 |
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