ISP1161A1BM ST-Ericsson Inc, ISP1161A1BM Datasheet - Page 27

• Manufacturer Part Number: ISP1161A1BM
• Description: IC USB HOST/DEVICE CTRLR 64-LQFP
• Manufacturer: ST-Ericsson Inc

Specifications of ISP1161A1BM

• Controller Type: USB 2.0 Controller
• Interface: Parallel
• Voltage - Supply: 3.3V, 5V
• Current - Supply: 47mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 64-LQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 568-1163; ISP1161A1BM,557

Philips Semiconductors
9397 750 13961
Product data
9.3 PTD data structure
The Philips Transfer Descriptor (PTD) data structure provides communication
between the HCD and the ISP1161A1 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
The PTD data structure is used by the HC to define a buffer of data that will be moved
to or from an endpoint in the USB device. This data buffer is set up for the current
frame (1 ms frame) by the HCD. The payload data for every transfer in the frame must
have a PTD as a header to describe the characteristics of the transfer. PTD data is
DWORD (double-word or 4-byte) aligned.
6. Transfer PTD data into HC’s FIFO buffer RAM
7. HC interprets PTD data
8. HC performs USB transactions via USB bus interface
9. HC informs HCD of the USB traffic results
Fig 25. PTD data in FIFO buffer RAM.
The physical storage media of PTD data for the HCD is the microprocessor’s
system RAM. For the ISP1161A1 HC, the storage media is the internal FIFO
buffer RAM.
The HCD prepares PTD data in the microprocessor system RAM for transfer to
the ISP1161A1 HC internal FIFO buffer RAM.
When PTD data is ready in the microprocessor’s system RAM, the HCD must
transfer the PTD data from the microprocessor’s system RAM into the
ISP1161A1 internal FIFO buffer RAM.
The HC determines what USB transactions are required based on the PTD data
that has been transferred into the internal FIFO buffer RAM.
The HC performs the USB transactions with the specified USB device endpoint
through the USB bus interface.
The USB transaction status and the feedback from the specified USB device
endpoint will be put back into the ISP1161A1 HC internal FIFO buffer RAM in
PTD data format. The HCD can read back the PTD data from the internal FIFO
buffer RAM.
Figure
Rev. 03 — 23 December 2004
25.
bottom
top
FIFO buffer RAM
payload data
payload data
payload data
PTD
PTD
PTD
USB single-chip host and device controller
MGT949
PTD data #1
PTD data #2
PTD data #N
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
ISP1161A1
26 of 136