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参数资料
型号： ISP1561BM,557
厂商： ST-ERICSSON
元件分类： 总线控制器
英文描述： UNIVERSAL SERIAL BUS CONTROLLER, PQFP128
封装： 14 X 14 MM, 1.40 MM HEIGHT, PLASTIC, MS-026, SOT-420-1, LQFP-128
文件页数： 37/103页
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
39 of 103
NXP Semiconductors
ISP1561
HS USB PCI Host Controller
Table 47.
HcCommandStatus register: bit allocation
Bit
31
30
29
28
27
26
25
24
Symbol
reserved
Reset
00000000
Access
--------
Bit
23
22
21
20
19
18
17
16
Symbol
reserved
SOC[1:0]
Reset
00000000
Access
------
R
Bit
15
14
13
12
11
10
9
8
Symbol
reserved
Reset
00000000
Access
--------
Bit
7
6
5
4
3
2
1
0
Symbol
reserved
OCR
BLF
CLF
HCR
Reset
00000000
Access
----
R/W
Table 48.
HcCommandStatus register: bit description
Bit
Symbol
Description
31 to 18
-
reserved
17 to 16
SOC[1:0]
Scheduling Overrun Count: The bit is incremented on each scheduling
overrun error. It is initialized to 00b and wraps around at 11b. It must be
incremented when a scheduling overrun is detected, even if the SO bit in
HcInterruptStatus is already set. This is used by the HCD to monitor any
persistent scheduling problems.
15 to 4
-
reserved
3
OCR
Ownership Change Request: This bit is set by an OS HCD to request a
change of control of the Host Controller. When set, the Host Controller
must set the OC (Ownership Change) eld in HcInterruptStatus. After the
changeover, this bit is cleared and remains so until the next request from
the OS HCD.
2
BLF
Bulk List Filled: This bit is used to indicate whether there are any
Transfer Descriptors (TDs) on the bulk list. It is set by the HCD whenever
it adds a TD to an ED in the bulk list. When the Host Controller begins to
process the head of the bulk list, it checks Bulk-Filled (BF). If BLF (Bulk
List Filled) is logic 0, the Host Controller does not need to process the
bulk list. If BLF is logic 1, the Host Controller must start processing the
bulk list and set BF to logic 0. If the Host Controller nds a TD on the list,
then the Host Controller must set BLF to logic 1, causing the bulk list
processing to continue. If no TD is found on the bulk list, and if the HCD
does not set BLF, then BLF is still logic 0 when the Host Controller
completes processing the bulk list and the bulk list processing stops.
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