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Universal serial bus full-speed device interface (USB)
RM0008
Bits 6:0 ADD[6:0]: Device address
These bits contain the USB function address assigned by the host PC during the
enumeration process. Both this field and the Endpoint Address (EA) field in the associated
USB_EPnR register must match with the information contained in a USB token in order to
handle a transaction to the required endpoint.
Buffer table address (USB_BTABLE)
Address offset: 0x50
Reset value: 0x0000
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
BTABLE[15:3]
Reserved
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
rw
Res.
Bits 15:3 BTABLE[15:3]: Buffer table
These bits contain the start address of the buffer allocation table inside the dedicated packet
memory. This table describes each endpoint buffer location and size and it must be aligned
to an 8 byte boundary (the 3 least significant bits are always ‘0’). At the beginning of every
transaction addressed to this device, the USP peripheral reads the element of this table
related to the addressed endpoint, to get its buffer start location and the buffer size (Refer to
Structure and usage of packet buffers on page 516 ).
Bits 2:0 Reserved, forced by hardware to 0.
21.5.2
Endpoint-specific registers
The number of these registers varies according to the number of endpoints that the USB
peripheral is designed to handle. The USB peripheral supports up to 8 bidirectional
endpoints. Each USB device must support a control endpoint whose address (EA bits) must
be set to 0. The USB peripheral behaves in an undefined way if multiple endpoints are
enabled having the same endpoint number value. For each endpoint, an USB_EPnR
register is available to store the endpoint specific information.
USB endpoint n register (USB_EPnR), n=[0..7]
Address offset: 0x00 to 0x1C
Reset value: 0x0000
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
CTR_
RX
DTOG
_RX
STAT_RX[1:0]
SETUP
EP
TYPE[1:0]
EP_
KIND
CTR_
TX
DTOG_
TX
STAT_TX[1:0]
EA[3:0]
rc_w0
t
t
t
r
rw
rw
rw
rc_w0
t
t
t
rw
rw
rw
rw
They are also reset when an USB reset is received from the USB bus or forced through bit
FRES in the CTLR register, except the CTR_RX and CTR_TX bits, which are kept
unchanged to avoid missing a correct packet notification immediately followed by an USB
reset event. Each endpoint has its USB_EPnR register where n is the endpoint identifier.
532/995
Doc ID 13902 Rev 9
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