參數(shù)資料
型號: ISP1161ABM
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: 7 X 7 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-414-1, LQFP-64
文件頁數(shù): 52/134頁
文件大小: 587K
代理商: ISP1161ABM
Philips Semiconductors
ISP1161A
Full-speed USB single-chip host and device controller
Product data
Rev. 03 — 23 December 2004
52 of 134
9397 750 13962
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
10.2 HC frame counter registers
10.2.1
HcFmInterval register (R/W: 0DH/8DH)
The HcFmInterval register contains a 14-bit value which indicates the bit time interval
in a frame (that is, between two consecutive SOFs), and a 15-bit value indicating the
full-speed maximum packet size that the HC may transmit or receive without causing
a scheduling overrun. The HCD may carry out minor adjustments on the
FrameInterval by writing a new value at each SOF. This allows the HC to synchronize
with an external clock source and to adjust any unknown clock offset.
Code (Hex): 0D —
read
Code (Hex): 8D —
write
Table 20:
Bit
Symbol
Reset
Access
Bit
Symbol
Reset
Access
Bit
Symbol
Reset
Access
Bit
Symbol
Reset
Access
HcFmInterval register: bit allocation
31
FIT
0
R/W
23
30
29
28
27
26
25
24
FSMPS[14:8]
0
R/W
19
FSMPS[7:0]
0
0
0
0
0
0
R/W
22
R/W
21
R/W
20
R/W
18
R/W
17
R/W
16
0
0
0
0
0
0
0
0
R/W
15
R/W
14
R/W
13
R/W
12
R/W
11
R/W
10
R/W
9
R/W
8
reserved
FI[13:8]
0
0
1
0
1
1
1
0
R/W
7
R/W
6
R/W
5
R/W
4
R/W
3
R/W
2
R/W
1
R/W
0
FI[7:0]
1
1
0
1
1
1
1
1
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Table 21:
Bit
31
HcFmInterval register: bit description
Symbol
Description
FIT
FrameIntervalToggle:
The HCD toggles this bit whenever it loads
a new value to FrameInterval.
FSMPS
[14:0]
value which is loaded into the Largest Data Packet Counter at the
beginning of each frame. The counter value represents the largest
amount of data in bits which can be sent or received by the HC in a
single transaction at any given time without causing a scheduling
overrun. The field value is calculated by the HCD.
-
reserved
FI[13:0]
FrameInterval:
Specifies the interval between two consecutive
SOFs in bit times. The default value is 11999. The HCD must save
the current value of this field before resetting the HC. Setting the
HostControllerReset of the HcCommandStatus register will cause
the HC to reset this field to its default value. HCD may choose to
restore the saved value upon completing the Reset sequence.
30 to 16
FSLargestDataPacket (FSMaximumPacketSize):
Specifies a
15 to 14
13 to 0
相關(guān)PDF資料
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ISP1161 Full-speed Universal Serial Bus single-chip host and device controller
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