Preliminary
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Registers
20.9.7.3.3 Transmit Hub Port Register (USBn_TXHUBPORTm)
The transmit hub port register (USBn_TXHUBPORTm) (meaningful in host mode operation only) only
needs to be written where a full- or low-speed device is connected to Tx endpoint EPn via a high-speed
USB 2.0 hub, which carries out the necessary transaction translation. In such circumstances, these
7-bit read/write registers need to be used to record the port of that USB 2.0 hub through which the
target associated with the endpoint is accessed.
Note: If Endpoint 0 is connected to a hub, then USBn_TXHUBPORT needs to be defined for this
endpoint.
The transmit hub port register is shown in
and described in
Figure 20-182. Transmit Hub Port (USBn_TXHUBPORTm)
7
6
0
Reserved
HUBPORT
R-0-1h
0-7Fh
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 20-201. Transmit Hub Port Register (USBn_TXHUBPORTm) Field Descriptions
Bit
Field
Description
7
Reserved
Reserved
6-0
HUBPORT
Port number of the hub
20.9.7.3.4 Receive Function Address Register (USBn_RXFUNCADDRm)
The receive function address register (USBn_RXFUNCADDRm) is a 7-bit read/write register
(meaningful in host mode operation only) that records the address of the target function that is to be
accessed through the associated endpoint (EPn). USBn_ RXFUNCADDR needs to be defined for each
Rx endpoint that is used.
Note: USBn_RXFUNCADDRm needs to be defined for endpoint 0. This register (together with the
USBn_RXHUBADDRm and USBn_RXHUBPORTm registers described below) allow the allocation of
multiple devices to the USB controller endpoints.
The receive function address register is shown in
and described in
Figure 20-183. Receive Function Address Register (USBn_RXFUNCADDRm)
7
6
0
Reserved
FUNCADDR
R-0-1h
0-7Fh
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 20-202. Receive Function Address Register (USBn_RXFUNCADDRm) Field Descriptions
Bit
Field
Description
7
Reserved
Reserved
6-0
FUNCADDR
Address of target function.
1977
SPRUGX9 – 15 April 2011
Universal Serial Bus (USB)
© 2011, Texas Instruments Incorporated
Содержание TMS320C6A816 Series
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