參數(shù)資料
型號(hào)： ISP1521
廠商： NXP Semiconductors N.V.
英文描述： Hi-Speed Universal Serial Bus hub controller
中文描述： 高速通用串行總線控制器樞紐
文件頁數(shù)： 18/53頁
文件大小： 270K
代理商： ISP1521
Philips Semiconductors
ISP1521
Hi-Speed USB hub controller
Product data
Rev. 03 — 24 November 2004
18 of 53
9397 750 13702
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
9.2.2
Architecture of configurable hub descriptors
The configurable hub descriptors can be masked in the internal ROM memory; see
Figure 7
. These descriptors can also be supplied from an external EEPROM or a
microcontroller. The ISP1521 implements both the master and slave I
2
C-bus
controllers. The information from the external EEPROM or the microcontroller is
transferred into the internal RAM during the power-on reset. A signature word is used
to identify correct descriptors. If the signature matches, the content of the RAM is
chosen instead of the ROM.
When the external microcontroller mode is selected and while the external
microcontroller is writing to the internal RAM, any request to configurable descriptors
will be responded to with a Not AcKnowledge (NAK). There is no specified time-out
period for the NAK signal. This data is then passed to the host during the
enumeration process.
The three configuration methods are selected by connecting pins SCL and SDA in the
manner given in
Table 11
.
The I
2
C-bus cannot be shared between the EEPROM and the external microcontroller.
Fig 7.
Configurable hub descriptors.
Table 11:
Configuration method
Internal ROM
External EEPROM
External microcontroller
Configuration method
SCL
ground
2.2 k
to 4.7 k
pull-up
driven LOW by the
microcontroller during reset
SDA
ground
2.2 k
to 4.7 k
pull-up
2.2 k
to 4.7 k
pull-up
MLD711
MICROCONTROLLER
SERIAL EEPROM
MASTER/SLAVE
I
2
C-BUS INTERFACE
signature
match
RAM
(256 bytes)
DESCRIPTOR
GENERATOR
INTERFACE
ROM
(256 bytes)
MUX
HUB CORE
I
2
C-bus
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ISP1521BE,518 功能描述:USB 接口集成電路 USB2 7-PORT HUB CTRLR 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
ISP1521BE,551 功能描述:USB 接口集成電路 USB2 7 PORT HUB 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
ISP1521BE,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
ISP1521BE518 制造商:ST-Ericsson 功能描述:IC CONTROLLER USB HUB 80LQFP
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