參數(shù)資料
型號(hào)： 935270523557
廠商： NXP SEMICONDUCTORS
元件分類： 總線控制器
英文描述： UNIVERSAL SERIAL BUS CONTROLLER, PQFP64
封裝： 7 X 7 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-414-1, LQFP-64
文件頁數(shù)： 42/93頁
文件大?。?/td> 2118K
代理商： 935270523557
Philips Semiconductors
ISP1160
Embedded USB Host Controller
Product data
Rev. 03 — 27 February 2003
47 of 89
9397 750 10765
Koninklijke Philips Electronics N.V. 2003. All rights reserved.
Code (Hex): 0E — read
10.2.3
HcFmNumber register (0FH—Read only)
The HcFmNumber register is a 16-bit counter. It provides a timing reference for
events happening in the HC and the HCD. The HCD may use the 16-bit value
specied in this register and generate a 32-bit frame number without requiring
frequent access to the register.
Table 23:
HcFmRemaining register: bit description
Bit
Symbol
Description
31
FRT
FrameRemainingToggle: This bit is loaded from the
FrameIntervalToggle eld of HcFmInterval whenever
FrameRemaining reaches 0. This bit is used by the Host Controller
Driver (HCD) for synchronization between FrameInterval and
FrameRemaining.
30 to 14
-
reserved
13 to 0
FR[13:0]
FrameRemaining: This counter is decremented at each bit time.
When it reaches zero, it is reset by loading the FrameInterval value
specied in HcFmInterval at the next bit time boundary. When
entering the USBOPERATIONAL state, the HC reloads it with the
content of the FrameInterval part of the HcFmInterval register and
uses the updated value from the next SOF.
Table 24:
HCFmNumber register: bit allocation
Bit
31
30
29
28
27
26
25
24
Symbol
reserved
Reset
00000000
Access
RRRRRRRR
Bit
23
22
21
20
19
18
17
16
Symbol
reserved
Reset
00000000
Access
RRRRRRRR
Bit
15
14
13
12
11
10
9
8
Symbol
FN[15:8]
Reset
00000000
Access
RRRRRRRR
Bit
7
6
5
4
3
2
1
0
Symbol
FN[7:0]
Reset
00000000
Access
RRRRRRRR
Table 25:
HcFmNumber register: bit description
Bit
Symbol
Description
31 to 16
reserved
15 to 0
FN[15:0]
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.
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