參數(shù)資料
型號(hào)： ISP1181B
廠商： NXP Semiconductors N.V.
英文描述： Full-speed Universal Serial Bus peripheral controller
中文描述： 全速通用串行總線外設(shè)控制器
文件頁(yè)數(shù)： 16/70頁(yè)
文件大?。?/td> 341K
代理商： ISP1181B
Philips Semiconductors
ISP1181B
Full-speed USB peripheral controller
Product data
Rev. 02 — 07 December 2004
16 of 70
9397 750 13958
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
10.2 8237 compatible mode
The 8237 compatible DMA mode is selected by clearing bit DAKOLY in the Hardware
Configuration Register (see
Table 20
). The pin functions for this mode are shown in
Table 8
.
The DMA subsystem of an IBM compatible PC is based on the Intel 8237 DMA
controller. It operates as a ‘fly-by’ DMA controller: the data is not stored in the DMA
controller, but it is transferred between an I/O port and a memory address. A typical
example of ISP1181B in 8237 compatible DMA mode is given in
Figure 4
.
The 8237 has two control signals for each DMA channel: DREQ (DMA Request) and
DACK (DMA Acknowledge). General control signals are HRQ (Hold Request) and
HLDA (Hold Acknowledge). The bus operation is controlled via MEMR (Memory
Read), MEMW (Memory Write), IOR (I/O read) and IOW (I/O write).
12
13
14
1101
1110
1111
OUT: read
OUT: read
OUT: read
IN: write
IN: write
IN: write
Table 7:
Endpoint selection for DMA transfer
…continued
Endpoint
identifier
EPIDX[3:0]
Transfer direction
EPDIR = 0
EPDIR = 1
Table 8:
Symbol
DREQ
DACK
EOT
RD
WR
8237 compatible mode: pin functions
Description
DMA request
DMA acknowledge
end of transfer
read strobe
write strobe
I/O
O
I
I
I
I
Function
ISP1181B requests a DMA transfer
DMA controller confirms the transfer
DMA controller terminates the transfer
instructs ISP1181B to put data on the bus
instructs ISP1181B to get data from the
bus
Fig 4.
ISP1181B in 8237 compatible DMA mode.
AD0,
DATA1 to DATA15
CPU
004aaa137
RAM
ISP1181B
DMA
CONTROLLER
8237
DREQ
DREQ
DACK
HRQ
HLDA
HRQ
HLDA
DACK
IOR
IOW
MEMR
MEMW
RD
WR
相關(guān)PDF資料
PDF描述
ISP1181BBS Full-speed Universal Serial Bus peripheral controller
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ISP1181 Full-speed Universal Serial Bus Interface Device(全速通用串行總線接口器件)
ISP1181DGG INDUCTOR 4.7NH +-.3NH 0402 SMD
ISP1183 Low-power Universal Serial Bus interface device with DMA
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ISP1181BBS 制造商:NXP Semiconductors 功能描述:IC CONTROLLER USB PERIPHERAL SMD 制造商:ST-Ericsson 功能描述:CONTROLLER USB PERIPHERAL 48HVQFN
ISP1181BBS,518 功能描述:USB 接口集成電路 USB 1.1 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
ISP1181BBS,551 功能描述:USB 接口集成電路 USB 1.1 DEVICE CONTROLLER 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
ISP1181BBS,557 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
ISP1181BBS518 制造商:ST-Ericsson 功能描述:CONTROLLER USB PERIPHERAL 48HVQFN
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