HD6417660 RENESAS [Renesas Technology Corp], HD6417660 Datasheet - Page 573

• Manufacturer Part Number: HD6417660
• Description: Renesas 32-Bit RISC Microcomputer
• Manufacturer: RENESAS [Renesas Technology Corp]

19.3.19 HcRhDescriptorA Register (HRDRA)
HRDRA is the first register of two registers describing the features of the root hub. The descriptor
length (11), descriptor type (T.B.D), and the hub controller current bit (0) of the class descriptor of
the hub are emulated by the host controller driver. All other bits are placed in the
HcRhDescriptorA register and HcRhDescriptorB register.
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
1
0
0
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R
R/W
R/W
R
Description
Power On To Power Good Time
These bits specify the waiting time until a host controller
driver access 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. The operation is not guaranteed if 1 is
written to these bits.
No Over Current Protection
This bit selects how the overcurrent status of the root
hub port is reported. When this bit is cleared, the OCPM
bit specifies global report or report at each port.
0: Overcurrent status is collectively reported for all
1: Overcurrent protection is not supported.
Over Current Protection Mode
This bit selects how the overcurrent status in the root-
hub port is reported. At reset, this bit reflects the same
mode as the PSM bit. When the NOCP bit is cleared,
this bit is valid.
0: Overcurrent status is collectively reported for all
1: Overcurrent status is reported for each port.
DeviceType
This bit indicates that the route hub is not a compound
device. This bit should always be set to 0.
downstream ports.
downstream ports.
Rev. 1.00, 02/04, page 535 of 804