Samsung S5PC100 User Manual page 831

S5PC100 USER'S MANUAL (REV1.0)
UHCLSTH Bit
Reserved [31:12]
LST [11:0]
5.2.19 USB HcRhDesciptorA Register (UHCRHDA, Address = 0xED40_0048)
The Root Hub Descriptor A register is the first register of two describing the characteristics of the root hub. The
descriptor length, descriptor type, and hub controller current fields of the Hub Class descriptor are emulated by
the HCD. All other fields are located in the Root Hub Descriptor A and Root Hub Descriptor B registers.
UHCRHDA Bit
POT [31:24]
PGT
Reserved [23:13]
NOCP [12]
OCPM [11]
DT [10]
Table 8.9-18 UHCLSTH Bit Definitions
Read as unknown and must be written as zero.
LSThreshold
This field contains an 12-bit value that is compared to the
Frame Remaining field (UHCFMR[FR]) prior to initiating a
low-speed transaction. The transaction is started only if the
Frame Remaining value is greater than or equal to this field.
The value is calculated by HCD with the consideration of
transmission and setup overhead.
Table 8.9-19 UHCRHDA Bit Definitions
PowerOnToPowerGoodTime
The duration that the HCD must wait before accessing a
powered on port (in 2-ms units)
Read as unknown and must be written as zero.
NoOverCurrentProtection
This bit describes if over-current protection is supported.
0 = Over-current protection is supported.
1 = Over-current protection is not supported.
OverCurrentProtectionMode
This bit describes how the over-current status for the root
hub ports is reported. At reset, this field reflects the same
mode as PowerSwitchingMode. This field is valid only if the
No Over Current Protection field is cleared.
0 = Over-current status is reported collectively for all
downstream ports (global).
1 = Over-current status is reported on a per-port basis.
DeviceType
This bit specifies that the root hub is not a compound
Description
Description
USB HOST CONTROLLER
R/W Reset Value
-
R/W
R/W Reset Value
R/W
-
R/W
R/W
R
8.9-31