MCBSTM32EXL Keil, MCBSTM32EXL Datasheet - Page 715
MCBSTM32EXL
Manufacturer Part Number
MCBSTM32EXL
Description
BOARD EVALUATION FOR STM32F103ZE
Manufacturer
Keil
Specifications of MCBSTM32EXL
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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RM0008
26.13
OTG_FS to fill in the available RAM space at best regardless of the current USB sequence.
With these features:
●
●
As the OTG_FS Core is able to fill in the 1.25 Kbyte RAM buffer very efficiently, and as
1.25 Kbyte of transmit/receive data is more than enough to cover a full speed frame, the
USB system is able to withstand the maximum full-speed data rate for up to one USB frame
(1 ms) without any CPU intervention.
OTG_FS interrupts
When the OTG_FS controller is operating in one mode, either Device or Host, the
application must not access registers from the other mode. If an illegal access occurs, a
mode mismatch interrupt is generated and reflected in the Core interrupt register (MMIS bit
in the OTG_FS_GINTSTS register). When the core switches from one mode to the other,
the registers in the new mode of operation must be reprogrammed as they would be after a
power-on reset.
Figure 268
The application gains good margins to calibrate its intervention in order to optimize the
CPU bandwidth usage:
–
–
The USB Core is able to maintain its full operating rate, that is to provide maximum full-
speed bandwidth with a great margin of autonomy versus application intervention:
–
–
it can accumulate large amounts of transmission data in advance compared to
when they are effectively sent over the USB
it benefits of a large time margin to download data from the single receive FIFO
it has a large reserve of transmission data at its disposal to autonomously manage
the sending of data over the USB
it has a lot of empty space available in the receive buffer to autonomously fill it in
with the data coming from the USB
shows the interrupt hierarchy.
Doc ID 13902 Rev 9
USB on-the-go full-speed (OTG_FS)
715/995
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