Universal serial bus full-speed device interface (USB) RM0440
2038/2126 RM0440 Rev 4
Reception buffer address n (USB_ADDRn_RX)
Address offset: [USB_BTABLE] + n*8 + 4
Note: In case of double-buffered or isochronous endpoints in the OUT direction, this address
location is referred to as USB_ADDRn_RX_1.
In case of double-buffered or isochronous endpoints in the IN direction, this address location
is used for USB_ADDRn_TX_1.
Reception byte count n (USB_COUNTn_RX)
Address offset: [USB_BTABLE] + n*8 + 6
Note: In case of double-buffered or isochronous endpoints in the OUT direction, this address
location is referred to as USB_COUNTn_RX_1.
In case of double-buffered or isochronous endpoints in the IN direction, this address location
is used for USB_COUNTn_TX_1.
This table location is used to store two different values, both required during packet
reception. The most significant bits contains the definition of allocated buffer size, to allow
buffer overflow detection, while the least significant part of this location is written back by the
USB peripheral at the end of reception to give the actual number of received bytes. Due to
the restrictions on the number of available bits, buffer size is represented using the number
of allocated memory blocks, where block size can be selected to choose the trade-off
between fine-granularity/small-buffer and coarse-granularity/large-buffer. The size of
allocated buffer is a part of the endpoint descriptor and it is normally defined during the
Bits 15:10 These bits are not used since packet size is limited by USB specifications to 1023 bytes. Their
value is not considered by the USB peripheral.
Bits 9:0 COUNTn_TX[9:0]: Transmission byte count
These bits contain the number of bytes to be transmitted by the endpoint associated with the
USB_EPnR register at the next IN token addressed to it.
1514131211109876543210
ADDRn_RX[15:1] -
rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw -
Bits 15:1 ADDRn_RX[15:1]: Reception buffer address
These bits point to the starting address of the packet buffer, which will contain the data
received by the endpoint associated with the USB_EPnR register at the next OUT/SETUP
token addressed to it.
Bit 0 This bit must always be written as ‘0 since packet memory is half-word wide and all packet
buffers must be half-word aligned.
151413121110987654321 0
BLSIZE NUM_BLOCK[4:0] COUNTn_RX[9:0]
rwrwrwrwrwrwrrrrrrrrr r
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