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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： | 8/69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
8 of 69
9397 750 06896
Philips Electronics N.V. 2000. All rights reserved.
7.2 Philips Serial Interface Engine (SIE)
The Philips SIE implements the full USB protocol layer. It is completely hardwired for
speed and needs no firmware intervention. The functions of this block include:
synchronization pattern recognition, parallel/serial conversion, bit (de-)stuffing, CRC
checking/generation, Packet IDentifier (PID) verification/generation, address
recognition, handshake evaluation/generation.
7.3 Memory Management Unit (MMU) and integrated RAM
The MMU and the integrated RAM provide the conversion between the USB speed
(12 Mbit/s bursts) and the parallel interface to the microcontroller (max. 12 Mbyte/s).
This allows the microcontroller to read and write USB packets at its own speed.
7.4 SoftConnect
The connection to the USB is accomplished by bringing D
+
(for high-speed USB
devices) HIGH through a 1.5 k
pull-up resistor. In the ISP1181 the 1.5 k
pull-up
resistor is integrated on-chip and is not connected to V
CC
by default. The connection
is established through a command sent by the external/system microcontroller. This
allows the system microcontroller to complete its initialization sequence before
deciding to establish connection with the USB. Re-initialization of the USB connection
can also be performed without disconnecting the cable.
The ISP1181 will check for USB V
BUS
availability before the connection can be
established. V
BUS
sensing is provided through pin V
BUS
.
Remark:
Note that the tolerance of the internal resistors is 25%. This is higher than
the 5% tolerance specified by the USB specification. However, the overall V
SE
voltage
specification for the connection can still be met with a good margin. The decision to
make use of this feature lies with the USB equipment designer.
7.5 GoodLink
Indication of a good USB connection is provided at pin GL through GoodLink
technology. During enumeration the LED indicator will blink on momentarily. When
the ISP1181 has been successfully enumerated (the device address is set), the LED
indicator will remain permanently on. Upon each successful packet transfer (with
ACK) to and from the ISP1181 the LED will blink off for 100 ms. During ‘suspend’
state the LED will remain off.
This feature provides a user-friendly indicator of the status of the USB device, the
connected hub and the USB traffic. It is a useful field diagnostics tool for isolating
faulty equipment. It can therefor help to reduce field support and hotline overhead.
A register bit can be set to stop the GoodLink LED blinking in traffic (see
Table 20
).
The LED indicator will then be permanently on.
7.6 Bit clock recovery
The bit clock recovery circuit recovers the clock from the incoming USB data stream
using a 4
×
over-sampling principle. It is able to track jitter and frequency drift as
specified by the USB Specification Rev. 1.1
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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