參數(shù)資料
型號(hào)： ISP1183BS
廠商： NXP SEMICONDUCTORS
元件分類： 總線控制器
英文描述： Low-power Universal Serial Bus interface device with DMA
中文描述： UNIVERSAL SERIAL BUS CONTROLLER, PQCC32
封裝： 5 X 5 MM, 0.85 MM HEIGHT, PLASTIC, MO-220, SOT-617-1, HVQFN-32
文件頁(yè)數(shù)： 19/62頁(yè)
文件大?。?/td> 295K
代理商： ISP1183BS
Philips Semiconductors
ISP1183
Low-power USB interface device with DMA
Product data
Rev. 01 — 24 February 2004
19 of 62
9397 750 11804
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
The following example shows the steps that occur in a typical DMA transfer:
1. The ISP1183 receives a data packet in one of its endpoint FIFOs; the packet
must be transferred to memory address 1234H.
2. The ISP1183 asserts the DREQ signal requesting the 8237 for a DMA transfer.
3. The 8237 asks the CPU to release the bus by asserting the HRQ signal.
4. After completing the current instruction cycle, the CPU places the bus control
signals (MEMR_N, MEMW_N, IOR_N and IOW_N) and the address lines in
three-state and asserts HLDA to inform the 8237 that it has control of the bus.
5. The 8237 sets its address lines to 1234H and activates the MEMW_N and IOR_N
control signals.
6. The 8237 asserts DACK_N to inform the ISP1183 that it will start a DMA transfer.
7. The ISP1183 places the byte or word to be transferred on the data bus lines
because its RD_N signal was asserted by the 8237.
8. The 8237 waits one DMA clock period and then deasserts MEMW_N and
IOR_N. This latches and stores the byte or word at the desired memory location.
It also informs the ISP1183 that the data on the bus lines has been transferred.
9. The ISP1183 deasserts the DREQ signal to indicate to the 8237 that DMA is no
longer needed. In the
single cycle mode
this is done after each byte or word, in
the
burst mode
following the last transferred byte or word of the DMA cycle.
10. The 8237 deasserts the DACK_N output indicating that the ISP1183 must stop
placing data on the bus.
11. The 8237 places the bus control signals (MEMR_N, MEMW_N, IOR_N and
IOW_N) and the address lines in three-state and deasserts the HRQ signal,
informing the CPU that it has released the bus.
12. The CPU acknowledges control of the bus by deasserting HLDA. After activating
the bus control lines (MEMR_N, MEMW_N, IOR_N and IOW_N) and the address
lines, the CPU resumes the execution of instructions.
For a typical bulk transfer, the above process is repeated 64 times, once for each
byte. After each byte, the address register in the DMA controller is incremented and
the byte counter is decremented.
11.3 DACK-only mode
The DACK-only DMA mode is selected by setting bit DAKOLY in the Hardware
Configuration register (see
Table 20
). The pin functions for this mode are shown in
Table 9
. A typical example of the ISP1183 in the DACK-only DMA mode is given in
Figure 10
.
Table 9:
Symbol
DREQ
DACK
DACK-only mode: pin functions
Description
DMA request
DMA acknowledge
I/O
O
I
Function
ISP1183 requests a DMA transfer
DMA controller confirms the transfer;
also functions as data strobe
not used
not used
RD_N
WR_N
read strobe
write strobe
I
I
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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(yè)面:1015 (CN2011-ZH PDF) 其它名稱:296-25223-2
ISP1183BS-S 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
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