isp1122 NXP Semiconductors, isp1122 Datasheet - Page 20

• Manufacturer Part Number: isp1122
• Description: Isp1122 Universal Serial Bus Stand-alone Hub
• Manufacturer: NXP Semiconductors

10. I
Philips Semiconductors
9397 750 07002
Product specification
2
C-bus interface
9.4.10 Get string descriptor (1)
9.4.11 Get string descriptor (2)
10.1 Protocol
9.4.6 Get configuration descriptor
9.4.7 Get device descriptor
9.4.8 Get hub descriptor
9.4.9 Get string descriptor (0)
The hub returns 25 bytes containing the configuration descriptor (9 bytes, see
Table
(7 bytes, see
The hub returns 18 bytes containing the device descriptor, see
The hub returns 9 bytes containing the hub descriptor, see
The hub returns 4 bytes containing the language ID, see
The hub returns 46 bytes containing the manufacturer name, see
The hub returns 16 bytes containing the product name, see
A simple I
product ID and some other configuration bits from an external EEPROM. The
interface supports single master operation at a nominal bus speed of 93.75 kHz.
The I
serial bus wires, SDA (data) and SCL (clock). Both lines are driven by open-drain
circuits and must be connected to the positive supply voltage via pull-up resistors.
The I
Each device on the I
select a device for access.
The master starts a data transfer using a START condition and ends it by generating
a STOP condition. Transfers can only be initiated when the bus is free. The receiver
must acknowledge each byte by means of a LOW level on SDA during the ninth clock
pulse on SCL.
For detailed information please consult The I
9398 393 40011.
•
•
•
•
Bus free: both SDA and SCL are HIGH
START: a HIGH-to-LOW transition on SDA, while SCL is HIGH
STOP: a LOW-to-HIGH transition on SDA, while SCL is HIGH
Data valid: after a START condition, data on SDA are stable during the HIGH
period of SCL; data on SDA may only change while SCL is LOW.
2
2
11), the interface descriptor (9 bytes, see
C-bus interface is intended for bidirectional communication between ICs via two
C-bus protocol defines the following conditions:
2
C-bus interface is provided in the ISP1122 to read customized vendor ID,
Table
Rev. 03 — 29 March 2000
13).
2
C-bus has a unique slave address, which the master uses to
2
C-bus and how to use it ., order number
Table
12) and the endpoint descriptor
Table
Table
Table
USB stand-alone hub
15.
Table
© Philips Electronics N.V. 2000. All rights reserved.
14.
Table
15.
ISP1122
10.
15.
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