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-rw-r--r--share/man/man9/usbdi.94
1 files changed, 4 insertions, 0 deletions
diff --git a/share/man/man9/usbdi.9 b/share/man/man9/usbdi.9
index 501c39f4c492..0e9f9f2e94a6 100644
--- a/share/man/man9/usbdi.9
+++ b/share/man/man9/usbdi.9
@@ -593,6 +593,10 @@ use the "usbd_xfer_set_stall()" and "usbd_transfer_clear_stall()"
functions! This flag is automatically cleared after that the stall or
clear stall has been executed.
.
+.It pre_scale_frames
+If this flag is set the number of frames specified is assumed to give the buffering time in milliseconds instead of frames.
+During transfer setup the frames field is pre scaled with the corresponding value for the endpoint and rounded to the nearest number of frames greater than zero.
+This option only has effect for ISOCHRONOUS transfers.
.El
.Pp
.Fa bufsize