參數(shù)資料
型號(hào): TSB82AA2I
廠(chǎng)商: Texas Instruments, Inc.
英文描述: 1394b OHCI-LYNX CONTROLLER
中文描述: 的1394b OHCI的山貓控制器
文件頁(yè)數(shù): 74/104頁(yè)
文件大?。?/td> 461K
代理商: TSB82AA2I
432
4.34 Isochronous Cycle Timer Register
The isochronous cycle timer register indicates the current cycle number and offset. When the TSB82AA2 device is
cycle master, this register is transmitted with the cycle start message. When the TSB82AA2 device is not cycle master,
this register is loaded with the data field in an incoming cycle start. In the event that the cycle start message is not
received, the fields can continue incrementing on their own (if programmed) to maintain a local time reference. See
Table 427 for a complete description of the register contents.
Bit
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
Name
Isochronous cycle timer
Type
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
Default
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Bit
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
Name
Isochronous cycle timer
Type
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
RWU
Default
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
Register:
Type:
Offset:
Default:
Isochronous cycle timer
Read/Write/Update
F0h
XXXX XXXXh
Table 427. Isochronous Cycle Timer Register Description
BIT
FIELD NAME
TYPE
DESCRIPTION
3125
cycleSeconds
RWU
This field counts seconds [rollovers from bits 2412 (cycleCount field)] modulo 128.
2412
cycleCount
RWU
This field counts cycles [rollovers from bits 110 (cycleOffset field)] modulo 8000.
This field counts 24.576-MHz clocks modulo 3072, that is, 125
μ
s. If an external 8-kHz clock
configuration is being used, then this field must be cleared to 0s at each tick of the external clock.
110
cycleOffset
RWU
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