參數(shù)資料
型號(hào): ISP1561BM,557
廠商: ST-ERICSSON
元件分類: 總線控制器
英文描述: UNIVERSAL SERIAL BUS CONTROLLER, PQFP128
封裝: 14 X 14 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-420-1, LQFP-128
文件頁數(shù): 51/103頁
文件大小: 457K
代理商: ISP1561BM,557
ISP1561_2
NXP B.V. 2007. All rights reserved.
Product data sheet
Rev. 02 — 5 March 2007
51 of 103
NXP Semiconductors
ISP1561
HS USB PCI Host Controller
11.1.15 HcFmRemaining register (address: content of the base address register +
38h)
The HcFmRemaining register is a 14-bit down counter showing the bit time remaining in
the current frame. Table 71 contains the bit allocation of this four-byte register.
11.1.16 HcFmNumber register (address: content of the base address register + 3Ch)
This register is a 16-bit counter, and the bit allocation is given in Table 73. It provides a
timing reference among events happening in the Host Controller 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 71.
HcFmRemaining register: bit allocation
Bit
31
30
29
28
27
26
25
24
Symbol
FRT
reserved
Reset
00000000
Access
R/W
-------
Bit
23
22
21
20
19
18
17
16
Symbol
reserved
Reset
00000000
Access
--------
Bit
15
14
13
12
11
10
9
8
Symbol
reserved
FR[13:8]
Reset
00000000
Access
-
R/W
Bit
7
6
5
4
3
2
1
0
Symbol
FR[7:0]
Reset
00000000
Access
R/W
Table 72.
HcFmRemaining register: bit description
Bit
Symbol
Description
31
FRT
Frame Remaining Toggle: This bit is loaded from the FIT (Frame Interval
Toggle) eld of HcFmInterval whenever FR (Frame Remaining) reaches 0.
This bit is used by the HCD for the synchronization between FI (Frame
Interval) and FR.
30 to 14
-
reserved
13 to 0
FR[13:0]
Frame Remaining: This counter is decremented at each bit time. When it
reaches 0, it is reset by loading the FI value specied in HcFmInterval at
the next bit time boundary. When entering the USBOPERATIONAL state,
the Host Controller reloads the content with the FI of HcFmInterval and
uses the updated value from the next SOF.
Table 73.
HcFmNumber register: bit allocation
Bit
31
30
29
28
27
26
25
24
Symbol
reserved
Reset
00000000
Access
--------
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