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USB on-the-go full-speed (OTG_FS) RM0008

862/1096 Doc ID 13902 Rev 12

OTG_FS Host channel-x transfer size register (OTG_FS_HCTSIZx) (x = 0..7,

where x = Channel_number)

Address offset: 0x510 + (Channel_number × 0x20)

Reset value: 0x0000 0000

Bit 2 Reserved

Bit 1 CHHM: Channel halted mask

0: Masked interrupt

1: Unmasked interrupt

Bit 0 XFRCM: Transfer completed mask

0: Masked interrupt

1: Unmasked interrupt

313029282726252423222120191817161514131211109876543210

Reserved

DPID PKTCNT XFRSIZ

rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw rw

Bit 31 Reserved

Bits 30:29 DPID: Data PID

The application programs this field with the type of PID to use for the initial transaction. The

host maintains this field for the rest of the transfer.

00: DATA0

01: DATA2

10: DATA1

11: MDATA (non-control)/SETUP (control)

Bits 28:19 PKTCNT: Packet count

This field is programmed by the application with the expected number of packets to be

transmitted (OUT) or received (IN).

The host decrements this count on every successful transmission or reception of an OUT/IN

packet. Once this count reaches zero, the application is interrupted to indicate normal

completion.

Bits 18:0 XFRSIZ: Transfer size

For an OUT, this field is the number of data bytes the host sends during the transfer.

For an IN, this field is the buffer size that the application has reserved for the transfer. The

application is expected to program this field as an integer multiple of the maximum packet size

for IN transactions (periodic and non-periodic).

ST STM32F101xx User Manual

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