ISP1160BD-T NXP Semiconductors, ISP1160BD-T Datasheet - Page 18
ISP1160BD-T
Manufacturer Part Number
ISP1160BD-T
Description
Manufacturer
NXP Semiconductors
Datasheet
1.ISP1160BD-T.pdf
(87 pages)
Specifications of ISP1160BD-T
Operating Temperature (max)
85C
Operating Temperature (min)
-40C
Operating Temperature Classification
Industrial
Mounting
Surface Mount
Lead Free Status / RoHS Status
Compliant
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ISP1160-01_7
Product data sheet
9.3 PTD data structure
The Proprietary Transfer Descriptor (PTD) data structure provides communication
between the HCD and the ISP1160/01’s USB HC. The PTD data contains information
required by the USB traffic. PTD data consists of a PTD followed by its payload data, as
shown in
3. Entry: The normal entry point. The microprocessor returns to this point when there
4. Need USB traffic: USB devices need the HC to generate USB traffic when they have
5. Prepare PTD data in μP system RAM: The communication between the HCD and
6. Transfer PTD data into HC’s FIFO buffer RAM: When PTD data is ready in the
7. HC interprets PTD data: The HC determines what USB transactions are required
8. HC performs USB transactions via USB bus interface: The HC performs the USB
9. HC informs HCD of the USB traffic results: The USB transaction status and the
are HC requests.
USB traffic requests such as:
a. Connecting to or disconnecting from downstream ports
b. Issuing the Resume signal to the HC.
To generate USB traffic, the HCD must enter the USB transaction loop.
the ISP1160/01 HC is in the form of Proprietary Transfer Descriptor (PTD) data. The
PTD data provides USB traffic information about the commands, status and USB data
packets.
The physical storage media of PTD data for the HCD is the microprocessor’s system
RAM. For the ISP1160/01’s HC, the storage media is the internal FIFO buffer RAM.
The HCD prepares PTD data in the microprocessor’s system RAM for transfer to the
ISP1160/01’s HC internal FIFO buffer RAM.
microprocessor’s system RAM, the HCD must transfer the PTD data from the
microprocessor’s system RAM into the ISP1160/01’s internal FIFO buffer RAM.
based on the PTD data that has been transferred into the internal FIFO buffer RAM.
transactions with the specified USB device endpoint through the USB bus interface.
feedback from the specified USB device endpoint will be put back into the
ISP1160/01’s HC internal FIFO buffer RAM in PTD data format. The HCD can read
back the PTD data from the internal FIFO buffer RAM.
Figure
16.
Rev. 07 — 29 September 2009
Embedded USB host controller
ISP1160/01
© ST-ERICSSON 2009. All rights reserved.
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