HD6417320 RENESAS [Renesas Technology Corp], HD6417320 Datasheet - Page 849

• Manufacturer Part Number: HD6417320
• Description: Renesas 32-Bit RISC Microcomputer SuperHTM RISC engine Family / SH7700 Series
• Manufacturer: RENESAS [Renesas Technology Corp]

24.3.19 Hc Rh Descriptor A Register (USBHRDA)
USBHRDA is the first register of two registers describing the features of the root hub. The reset
value is implementation specific. The descriptor length (11), descriptor type (TBD), and the hub
controller current bit (0) of Class Descriptor of the hub are emulated by HCD. All other bits are
placed in USBHRDA and USBHRDB.
Bit
31
30
29
28
27
26
25
24
23 to 13 
12
11
10
Bit Name
POTPGT7
POTPGT6
POTPGT5
POTPGT4
POTPGT3
POTPGT2
POTPGT1
POTPGT0
NOCP
OCPM
DT
Initial
Value
0
0
0
0
0
0
1
0
All 0
0
0
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R/W
R
R/W
Description
Power On To Power Good Time
These bits specify the time required for waiting before
accessing the power-on port of the root hub. These bits
are implementation specific. The unit of time is 2 ms. The
time is calculated as POTPGT × 2 ms.
Reserved
These bits are always read as 0. The write value should
always be 0.
No Over Current Protection
This bit selects how the over-current status of the root hub
is reported. When this bit is cleared, the OCPM bit
specifies global report or report at each port.
0: Over-current status is collectively reported for all
1: Over-current protection is not supported
Over Current Protection Mode
This bit selects how the over-current status in the root-hub
port is reported. At reset, this bit reflects the same mode of
PowerSwitchingMode. When the NOCP bit is cleared, this
bit is valid.
0: Over-current status is collectively reported for all
1: Over-current protection is not supported
Device Type
This bit indicates that the USB Host Controller is not a
compound device. Always set this bit to 0.
downstream ports
downstream ports
Rev. 3.00 Jan. 18, 2008 Page 787 of 1458
Section 24
USB Host Controller (USBH)
REJ09B0033-0300