RM0319 datasheet(119/368 Pages) STMICROELECTRONICS

119 / 368 page

RM0319

USB 2.0 Device ports (UDC)

Doc ID 022640 Rev 3

119/368

11.3.1

USB transaction layer interface (UTLI)

The USB transaction layer interface (UTLI) of the UDC-AHB subsystem interfaces with the

UDC and the FIFOs to handle data reception/transmission with a USB Host.

The main tasks of UTLI are:

●

Interfaces to the UDC,

●

Interfaces to endpoint-specific TxFIFOs (Section 11.3.6: Endpoint FIFO controller

(Transmit FIFO controller)) when transmitting data in response to in requests from USB

Host,

●

Interfaces to the common RxFIFO (Section 11.3.4: Receive FIFO controller) when

receiving out data from the USB Host,

●

Works with the CSRs block (Section 11.3.7: Control and status registers) to maintain

correct status and control,

●

Works with the interrupt manager block (Section 11.3.2: Interrupt manager) to generate

proper interrupts to the application,

●

Interfaces to the SOF tracker (Section 11.3.3: SOF tracker) to ensure that isochronous

data is transmitted in intended frame.

In particular, during data reception from a USB Host (that is, an out transaction), the UTLI

directly read incoming data from the UDC and writes them to the receive FIFO

(Section 11.3.4: Receive FIFO controller). Besides, for data transmission to a USB Host

(that is, an in transaction), the UTLI reads data to be transmitted from relevant endpoint

FIFO (Section 11.3.6: Endpoint FIFO controller (Transmit FIFO controller)) and provides

them to UDC.

11.3.2

Interrupt manager

The interrupt manager block controls the generation of interrupts to the application. In

particular, exchanging information with the UTLI, an interrupt is issued by the interrupt

manager when any of the following device-level events occurs:

●

Reception of a SOF token from the USB Host,

●

Detection of a USB suspend,

●

Detection of a USB reset,

●

Completion of speed enumeration,

●

Reception of a Set Interface command (defined in USB specification),

●

Reception of a Set Configuration command (defined in USB specification).

In addition, the interrupt manager also triggers an interrupt when any of the following

endpoint-specific events occurs:

●

Reception of a request for in data,

●

Reception of an out data packet,

●

Reception of 8 bytes of SETUP data packet,

●

An application error resulting in an AHB error response.

The interrupt manager block maintains the device interrupt register and the device interrupt

mask register, which are mapped into the address space of the global control and status

registers (CSRs, Section 11.3.7: Control and status registers).

Interrupt (IRQ24) issued will be the OR of all active events defined above, plus the plug

detect interrupt.

RM0319 Datasheet(PDF) 119 Page - STMicroelectronics

RM0319 Datasheet(HTML) 119 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Descarga

Enlace URL