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參數資料
型號: ISP1161BD
廠商: NXP SEMICONDUCTORS
元件分類: 總線控制器
英文描述: Full-speed Universal Serial Bus single-chip host and device controller
中文描述: UNIVERSAL SERIAL BUS CONTROLLER, PQFP64
封裝: 10 X 10 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-314-2, LQFP-64
文件頁數: 65/127頁
文件大小: 2762K
代理商: ISP1161BD
Philips Semiconductors
ISP1161
Full-speed USB single-chip host and device controller
Product data
Rev. 01 — 3 July 2001
65 of 130
9397 750 08313
Philips Electronics N.V. 2001. All rights reserved.
Code (Hex): 0F —
read
13.2.4
HcLSThreshold Register
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.
Table 33: HcFmNumber Register: bit description
Bit
Symbol
31 to 16
15 to 0
FN[15:0]
Description
reserved
FrameNumber:
This is incremented when HcFmRemaining is
reloaded. It will be rolled over to 0H after FFFFH. When the
USBOPERATIONAL state is entered, this will be incremented
automatically. HC will set the StartofFrame in HcInterruptStatus.
Table 34: HcLSThreshold Register: bit allocation
Bit
31
Symbol
Reset
Access
Bit
23
Symbol
Reset
Access
Bit
15
Symbol
Reset
0
Access
Bit
7
Symbol
Reset
0
Access
30
29
28
27
26
25
24
reserved
00H
R/W
22
21
20
19
18
17
16
reserved
00H
R/W
14
13
12
11
10
9
8
reserved
0
LST[10:8]
1
0
0
0
1
0
R/W
6
5
4
3
2
1
0
LST[7:0]
0
1
0
1
0
0
0
R/W
Table 35: HcLSThreshold Register: bit description
Bit
Symbol
Description
31 to 16
reserved
15 to 11
reserved
10 to 0
LST[10:0]
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
setup overhead.
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