ISP1161A1BMGA STEricsson, ISP1161A1BMGA Datasheet - Page 55

• Manufacturer Part Number: ISP1161A1BMGA
• Manufacturer: STEricsson

Specifications of ISP1161A1BMGA

• Operating Temperature (max): 85C
• Operating Temperature (min): -40C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Lead Free Status / RoHS Status: Compliant

ISP1161A1_5
Product data sheet
Bit
Symbol
Reset
Access
Bit
Symbol
Reset
Access
10.3 HC Root Hub registers
R/W
15
0
7
Table 27.
All registers included in this partition are dedicated to the USB Root Hub, which is an
integral part of the HC although it is functionally a separate entity. The Host Controller
Driver (HCD) emulates USBD accesses to the Root Hub via a register interface. The HCD
maintains many USB-defined hub features that are not required to be supported in
hardware. For example, the Hub’s Device, Configuration, Interface, Endpoint Descriptors,
as well as some static fields of the Class Descriptor, are maintained only in the HCD. The
HCD also maintains and decodes the Root Hub’s device address as well as other minor
operations more suited for software than for hardware.
The Root Hub registers were developed to match the bit organization and operation of
typical hubs found in the system.
Four 32-bit registers have been defined:
Each register is read and written as a DWORD. These registers are only written during
initialization to correspond with the system implementation. The HcRhDescriptorA and
HcRhDescriptorB registers are writeable regardless of the HC’s USB states. HcRhStatus
and HcRhPortStatus are writeable during the USBOperational state only.
Bit
31 to 11
10 to 0
•
•
•
•
HcRhDescriptorA
HcRhDescriptorB
HcRhStatus
HcRhPortStatus[1:NDP]
R/W
14
0
6
HcLSThreshold register: bit description
Symbol
-
LST[10:0]
reserved
R/W
13
0
5
Rev. 05 — 29 September 2009
Description
reserved
LSThreshold: Contains a value that is compared to the
FrameRemaining field before a low-speed transaction is initiated. The
transaction is started only if FrameRemaining ≥ this field. The value is
calculated by the HCD, which considers transmission and set-up
overhead. Default value: 1576 (628H)
R/W
12
0
4
LST[7:0]
28H
R/W
USB single-chip host and device controller
R/W
11
0
3
R/W
10
1
2
LST[10:8]
ISP1161A1
© ST-ERICSSON 2009. All rights reserved.
R/W
9
1
1
R/W
55 of 137
8
0
0