ISP1160BM,518 NXP Semiconductors, ISP1160BM,518 Datasheet - Page 46

• Manufacturer Part Number: ISP1160BM,518
• Manufacturer: NXP Semiconductors

Specifications of ISP1160BM,518

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

Table 26.
ISP1160-01_7
Product data sheet
Bit
Symbol
Reset
Access
Bit
Symbol
Reset
Access
Bit
Symbol
Reset
Access
Bit
Symbol
Reset
Access
HcLSThreshold register: bit allocation
10.2.4 HcLSThreshold register (R/W: 11H/91H)
10.3 HC Root Hub registers
R/W
R/W
R/W
R/W
31
23
15
0
0
0
7
0
The HcLSThreshold register contains an 11-bit value used by the HC to determine
whether to commit to the transfer of a maximum of 8-byte LS packet before EOF. Neither
the HC nor the HCD is allowed to change this value.
Code (Hex): 11 — read
Code (Hex): 91 — write
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, and 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 hardware.
The Root Hub registers were developed to match the bit organization and operation of
typical hubs found in the system.
Bit
31 to 11
10 to 0
R/W
R/W
R/W
R/W
30
22
14
0
0
0
6
0
HcLSThreshold register: bit description
Symbol
-
LST[10:0]
reserved
R/W
R/W
R/W
R/W
29
21
13
0
0
0
5
1
Rev. 07 — 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.
R/W
R/W
R/W
R/W
28
20
12
0
0
0
4
0
reserved
reserved
LST[7:0]
R/W
R/W
R/W
R/W
27
19
11
0
0
0
3
1
Embedded USB host controller
R/W
R/W
R/W
R/W
26
18
10
0
0
1
2
0
ISP1160/01
LST[10:8]
© ST-ERICSSON 2009. All rights reserved.
R/W
R/W
R/W
R/W
25
17
0
0
9
1
1
0
R/W
R/W
R/W
R/W
24
16
0
0
8
0
0
0
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