ISP1161A1BMUM STEricsson, ISP1161A1BMUM Datasheet - Page 56

• Manufacturer Part Number: ISP1161A1BMUM
• Manufacturer: STEricsson

Specifications of ISP1161A1BMUM

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

Philips Semiconductors
Table 26:
9397 750 13961
Product data
Bit
Symbol
Reset
Access
Bit
Symbol
Reset
Access
Bit
Symbol
Reset
Access
Bit
Symbol
Reset
Access
HcLSThreshold register: bit allocation
R/W
31
23
15
0
7
10.2.4 HcLSThreshold register (R/W: 11H/91H)
10.3 HC Root Hub registers
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, 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.
Bit
31 to 11
10 to 0
R/W
30
22
14
0
6
HcLSThreshold register: bit description
Symbol
LST[10:0]
reserved
R/W
29
21
13
0
5
Rev. 03 — 23 December 2004
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
value is calculated by the HCD, which considers transmission and
set-up overhead. Default value: 1576 (628H)
R/W
28
20
12
0
4
reserved
reserved
LST[7:0]
R/W
R/W
R/W
00H
00H
28H
USB single-chip host and device controller
R/W
27
19
11
0
3
R/W
26
18
10
1
2
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
ISP1161A1
LST[10:8]
R/W
25
17
9
1
1
this field. The
R/W
55 of 136
24
16
8
0
0