PSB21473FV13XT Infineon Technologies, PSB21473FV13XT Datasheet - Page 531

• 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

If bit SOFDE is set, buffer switching is done automatically after SOF (start of frame) has
been detected by the USB. Figure 22-16 describes this functionality for USB read
access for this case. The buffer which contains the latest data from the CPU is tagged
valid for USB access (UBF=1) at
empty. After the USB read access has occured at
empty again (UBF=0) and can be swapped again as soon as the CPU has filled its buffer
(at
threshold is always active, but an occurrence of SOF (if SOFDE=1) or setting bit DONE
by software are used to tag the CPU buffer full before reaching MaxLen.
Figure 22-16 Dual Buffer Mode USB Read Access: Buffer Switching on SOF with
Data Sheet
MaxLen
Len1
Len2
MaxLen
Len1
Len2
3
). The number of bytes in the buffer is less or equal MaxLen. The MaxLen
USB read accesses
Data Bytes
Number of
CBF
UBF
= 0
= 0
SOF (n)
SOFDE=1
set
Frame n
Page 0
Page 1
1
and the buffers are swapped if the USB buffer is
SOF (n+1)
CPU write accesses
531
set
Swap
Buffer
1
2
UBF = 0
2
, this buffer assigned to USB is
Frame n+1
Page 0
Page 1
SOF (n+2)
USB Module
PSB 21473
set
3
Swap
Buffer
2003-03-31
MCT03409
INCA-D
Time
Time