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參數資料
| 型號： | ISP1181 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Full-speed Universal Serial Bus Interface Device(全速通用串行總線接口器件) |
| 中文描述： | 全速通用串行總線接口設備（全速通用串行總線接口器件） |
| 文件頁數： | 14/69頁 |
| 文件大小： | 1655K |
| 代理商： | ISP1181 |
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Philips Semiconductors
ISP1181
Full-speed USB interface
Objective specification
Rev. 01 — 13 March 2000
14 of 69
9397 750 06896
Philips Electronics N.V. 2000. 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 22
). 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 ISP1181 in 8237 compatible DMA mode is given in
Figure 3
.
The 8237 has two control signals for each DMA channel: DRQ (DMA Request) and
DACK (DMA Acknowledge). General control signals are HRQ (Hold Request), HLDA
(Hold Acknowledge) and EOP (End-Of-Process). The bus operation is controlled via
MEMR (Memory Read), MEMW (Memory Write), IOR (I/O read) and IOW (I/O write).
8
9
1001
1010
1011
1100
1101
1110
1111
OUT: read
OUT: read
OUT: read
OUT: read
OUT: read
OUT: read
OUT: read
IN: write
IN: write
IN: write
IN: write
IN: write
IN: write
IN: write
10
11
12
13
14
Table 7:
Endpoint selection for DMA transfer
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
ISP1181 requests a DMA transfer
DMA controller confirms the transfer
DMA controller terminates the transfer
instructs ISP1181 to put data on the bus
instructs ISP1181 to get data from the bus
Fig 3.
ISP1181 in 8237 compatible DMA mode.
idth
AD,
DATA1 to DATA15
CPU
MGS778
RAM
ISP1181
DMA
CONTROLLER
8237
DREQ
DREQ
DACK
HRQ
HLDA
HRQ
HLDA
DACK
IOR
IOW
MEMR
MEMW
RD
WR
相關PDF資料 |
PDF描述 |
|---|---|
| ISP1181DGG | INDUCTOR 4.7NH +-.3NH 0402 SMD |
| ISP1183 | Low-power Universal Serial Bus interface device with DMA |
| ISP1183BS | Low-power Universal Serial Bus interface device with DMA |
| ISP1301 | Universal Serial Bus On-The-Go transceiver |
| ISP1301BS | Universal Serial Bus On-The-Go transceiver |
相關代理商/技術參數 |
參數描述 |
|---|---|
| ISP1181A | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Full-speed Universal Serial Bus peripheral controller |
| ISP1181ABS | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Full-speed Universal Serial Bus peripheral controller |
| ISP1181ABS,518 | 功能描述:USB 接口集成電路 USB 1.1 ADV DEVICE RoHS:否 制造商:Cypress Semiconductor 產品:USB 2.0 數據速率: 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 安裝風格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| ISP1181ABS,551 | 功能描述:USB 接口集成電路 USB 1.1 ADVANCED DEVICE RoHS:否 制造商:Cypress Semiconductor 產品:USB 2.0 數據速率: 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 安裝風格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
| ISP1181ABS,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 產品:USB 2.0 數據速率: 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 安裝風格:SMD/SMT 封裝 / 箱體:WLCSP-20 |
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