Receive Hub Address Register (Usbn_Rxhubaddrm); Receive Hub Port Register (Usbn_Rxhubportm) - Texas Instruments TMS320C6A816 Series Technical Reference Manual

Registers

20.9.7.3.5 Receive Hub Address Register (USBn_RXHUBADDRm)

The receive hub address register (USBn_RXHUBADDRm) is an 8-bit read/write register (meaningful in
host mode operation only) that, like USBn_RXHUBPORTm, only needs to be written where a full- or
low-speed device is connected to Rx endpoint EPn via a high-speed USB 2.0 hub that carries out the
necessary transaction translation to convert between high-speed transmission and full-/low-speed
transmission. In such circumstances:
• The lower 7 bits should record the address of this USB 2.0 hub
• The top bit should record whether the hub has multiple transaction translators (set to '0' if single
transaction translator; set to '1' if multiple transaction translators).
Note: If endpoint 0 is connected to a hub, then USBn_RXHUBADDRm need to be defined for this
endpoint.
The receive hub address register is shown in
Figure 20-184. Receive Hub Address Register (USBn_RXHUBADDRm)
7 6
Reserved
R-0-1h
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 20-203. Receive Hub Address Register (USBn_RXHUBADDRm) Field Descriptions
Bit Field
7 MULT_TRANS
6-0 HUBADDR

20.9.7.3.6 Receive Hub Port Register (USBn_RXHUBPORTm)

The receive hub port register (USBn_RXHUBPORTm) (meaningful in host mode operation only) only
needs to be written where a full- or low-speed device is connected to Rx endpoint EPn via a high-speed
USB 2.0 hub that 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_RXHUBPORT needs to be defined for this
endpoint.
The receive hub port register is shown in
Figure 20-185. Receive Hub Port Register (USBn_RXHUBPORTm)
7 6
Reserved
R-0-1h
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 20-204. Receive Hub Port Register (USBn_RXHUBPORTm) Field Descriptions
Bit Field
7 Reserved
6-0 HUBPORT
1978
Universal Serial Bus (USB)
Preliminary
Figure 20-184
HUBADDR
0-7Fh
Description
Set to 1 if hub has multiple transaction translators. Cleared to 0 if only single
transaction translator is available.
Address of HUB.
Figure 20-185 and described in
HUBPORT
0-7Fh
Description
Reserved
Port number of HUB.
© 2011, Texas Instruments Incorporated
and described in Table 20-203.
Table 20-204
SPRUGX9 – 15 April 2011
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