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PDIUSBH11A Datasheet(PDF) 9 Page - NXP Semiconductors |
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PDIUSBH11A Datasheet(HTML) 9 Page - NXP Semiconductors |
9 / 28 page Philips Semiconductors Product specification PDIUSBH11A Universal Serial Bus Hub 1999 Jul 22 9 APPLICATION DIAGRAM I2C GOODLINK ™ LED POWER SWITCH AND OVERCURRENT CIRCUIT 5V SWITCHED 5V H11A µC CLKOUT 12MHz USB DOWNSTREAM USB UPSTREAM 3.3V SV00840 I2C Interface The I2C bus is used to interface to an external microcontroller needed to control the operation of the hub. For cost consideration, the target system microcontroller can be shared and utilized for this purpose. The PDIUSBH11A implements a slave I2C interface. When the PDIUSBH11A needs to communicate with the microcontroller it asserts an interrupt signal. The microcontroller services this interrupt by reading the appropriate status register on the PDIUSBH11A through the I2C bus. (For more information about the I2C serial bus, refer to the I2C Handbook, Philips order number 9397 750 00013). The I2C interface on the PDIUSBH11A defines two types of transactions: 1. command transaction A command transaction is used to define which data (e.g., status byte, buffer data, ...) will be read from / written to the USB interface in the next data transaction. A data transaction usually follows a command transaction. 2. data transaction A data transaction reads data from / writes data to the USB interface. The meaning of the data is dependent on the command transaction which was sent before the data transaction. Two addresses are used to differentiate between command and data transactions. Writing to the command address is interpreted as a command, while reading from / writing to the data address is used to transfer data between the PDIUSBH11A and the controller. ADDRESS TABLE TYPE OF ADDRESS PHYSICAL ADDRESS (MSB to LSB) Command 0011 011 (binary) Data 0011 010 (binary) Protocol An I2C transaction starts with a Start Condition, followed by an address. When the address matches either the command or data address the transaction starts and runs until a Stop Condition or another Start Condition (repeated start) occurs. The command address is write-only and is unable to do a read. The next bytes in the message are interpreted as commands. Several command bytes can be sent after one command address. Each of the command bytes is acknowledged and passed on to the Memory Management Unit inside the PDIUSBH11A. When the start condition address matches the data address, the next bytes are interpreted as data. When the RW bit in the address indicates a ‘master writes data to slave’ (=‘0’) the bytes are received, acknowledged and passed on to the Memory Management Unit. If the RW bit in the address indicates a ‘master reads data from slave’ (=‘1’) the PDIUSBH11A will send data to the master. The I2C-master must acknowledge all data bytes except the last one. In this way the I2C interface knows when the last byte has been transmitted and it then releases the SDA line so that the master controller can generate the STOP condition. Repeated start support allows another packet to be sent without generating a Stop Condition. Timing The I2C interface in the PDIUSBH11A can support clock speeds up to 1MHz. |
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