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: 54/103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
54 of 103
NXP Semiconductors
ISP1561
HS USB PCI Host Controller
11.1.19 HcRhDescriptorA register (address: content of the base address register +
48h)
The HcRhDescriptorA register is the rst of two registers describing the characteristics of
the root hub. Reset values are implementation-specic.
Table 79 contains the bit allocation of the HcRhDescriptorA register.
[1]
X is 1 for OHCI1 (2P) and OHCI2 (2P); X is 0 for OHCI1 (1P) and OHCI2 (1P).
[2]
X is 0 for OHCI1 (2P) and OHCI2 (2P); X is 1 for OHCI1 (1P) and OHCI2 (1P).
Table 78.
HcLSThreshold register: bit description
Bit
Symbol
Description
31 to 12
-
reserved
11 to 0
LST[11:0]
LS Threshold: This eld contains a value that is compared to the FR
(Frame Remaining) eld prior to initiating a low-speed transaction.
The transaction is started only if FR
≥ this eld. The value is
calculated by the HCD, considering the transmission and set-up
overhead.
Table 79.
HcRhDescriptorA register: bit allocation
Bit
31
30
29
28
27
26
25
24
Symbol
POTPGT[7:0]
Reset
11111111
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
NOCP
OCPM
DT
NPS
PSM
Reset
00001001
Access
-
R/W
R
R/W
Bit
7
6
5
4
3
2
1
0
Symbol
NDP[7:0]
Reset
000000
Access
RRRRRRRR
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