PSB21473FV13XT Infineon Technologies, PSB21473FV13XT Datasheet - Page 520

• Manufacturer Part Number: PSB21473FV13XT
• Manufacturer: Infineon Technologies

Specifications of PSB21473FV13XT

• Operating Supply Voltage (typ): 3.3V
• Operating Supply Voltage (min): 3.135V
• Operating Supply Voltage (max): 3.6V
• Operating Temp Range: 0C to 70C
• Operating Temperature Classification: Commercial
• Mounting: Surface Mount
• Pin Count: 144
• Lead Free Status / RoHS Status: Compliant

Data Sheet
22.4
22.4.1
Every endpoint of the USB module can operate in 2 modes, dual buffer mode and single
buffer mode. Each mode provides random or sequential access to the USB memory.
Figure 22-6 shows the possible buffer modes.
Figure 22-6 Memory Buffer Modes
Single Buffer Mode
In single buffer mode, the USB module and the CPU use one common memory page.
The active buffer page is either page 0 or page 1.
Dual Buffer Mode
In dual buffer mode the USB module and the CPU write into different USB memory
pages allowing back-to-back data transfers. Switching between the pages is done
automatically, enabling a high data transfer rate between the CPU and the USB module.
Random Access
Random access is available in both modes. Random access allows to change only a few
bytes in a data block of the USB memory buffer. When the CPU has modified the bytes
in the data block, setting of bit DONE by software marks the buffer ready for transmission
or reception of data over the USB pipe. For modification of a specific byte in the buffer,
Sequential
Access
Memory Buffer
Overview
Dual Buffer Mode
Random
Access
Buffer Modes
520
Sequential
Access
Single Buffer Mode
Random
2154_24.vsd
Access
USB Module
PSB 21473
2003-03-31
INCA-D