PSB21473FV13XT Infineon Technologies, PSB21473FV13XT Datasheet - Page 529

• 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

Figure 22-14 describes an example of a USB read operation in sequential mode with
both buffers empty at the beginning of the USB read operation.
The CPU starts writing data with sequential access (INCE=1) to the buffer assigned to
the CPU at
buffer assigned to the USB is empty (UBF=0) and as a result both buffers are logically
swapped. Now the buffer assigned to USB is full (UBF=1) and an USB read access can
take place. After the USB read access, the buffer assigned to the USB is empty again
with UBF=0. During the USB read access the CPU is still allowed to write into its
assigned buffer. When reaching MaxLen at
are again logically swapped. The USB further execute its read access.
Figure 22-14 Dual Buffer Mode USB Read Access : Buffer Switching when MaxLen
In dual buffer mode, the physical assignment of the USB memory pages (page 0 or page
1) to either CPU buffer or USB buffer is controlled automatically in the USB module and
cannot be selected by software.
Data Sheet
MaxLen
MaxLen
USB read accesses
Data Bytes
Number of
CBF
UBF
= 0
= 0
1
SOF (n)
set
. By definition, the buffer is full when MaxLen is reached at
is reached
1
Page 0
Page 1
Frame n
UBF = 1
Swap
Buffer
2
SOF (n+1)
CPU write accesses
529
set
3
, the CPU buffer is full and both buffers
Page 0
Page 1
UBF = 0
Frame n+1
UBF = 1
Swap
Buffer
SOF (n+2)
3
2
USB Module
set
PSB 21473
. The second
Page 0
Page 1
2003-03-31
MCT03407
INCA-D
Time
Time