參數(shù)資料
型號: ISP1161A1BM,557
廠商: NXP SEMICONDUCTORS
元件分類: 總線控制器
英文描述: 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): 92/137頁
文件大?。?/td> 599K
代理商: ISP1161A1BM,557
Philips Semiconductors
ISP1161A1
USB single-chip host and device controller
Product data
Rev. 03 — 23 December 2004
57 of 136
9397 750 13961
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Table 29:
HcRhDescriptorA register: bit description
Bit
Symbol
Description
31 to 24
POTPGT
[7:0]
PowerOnToPowerGoodTime: This byte species the duration
HCD has to wait before accessing a powered-on port of the Root
Hub. The unit of time is 2 ms. The duration is calculated as
POTPGT
× 2ms.
23 to 13
-
reserved
12
NOCP
NoOverCurrentProtection: This bit describes how the
overcurrent status for the Root Hub ports are reported. When this
bit is cleared, the OverCurrentProtectionMode eld species
global or per-port reporting.
0 — overcurrent status is reported collectively for all downstream
ports
1 — no overcurrent reporting supported
11
OCPM
OverCurrentProtectionMode: This bit describes how the
overcurrent status for the Root Hub ports is reported. At reset, this
eld reects the same mode as PowerSwitchingMode. This eld is
valid only if the NoOverCurrentProtection eld is cleared.
0 — overcurrent status is reported collectively for all downstream
ports.
1 — overcurrent status is reported on a per-port basis. On
power-up, clear this bit and then set it to logic 1.
10
DT
DeviceType: This bit species that the Root Hub is not a
compound device—it is not permitted. This eld will always
read/write 0.
9
NPS
NoPowerSwitching: This bit is used to specify whether power
switching is supported or ports are always powered. It is
implementation-specic. When this bit is cleared, the bit
PowerSwitchingMode species global or per-port switching.
0 — ports are power switched
1 — ports are always powered on when the HC is powered on
8
PSM
PowerSwitchingMode: This bit is used to specify how the power
switching of the Root Hub ports is controlled. It is
implementation-specic. This eld is valid only if the
NoPowerSwitching eld is cleared.
0 — all ports are powered at the same time
1 — each port is powered individually. This mode allows port
power to be controlled by either the global switch or per-port
switching. If bit PortPowerControlMask is set, the port responds to
only port power commands (Set/ClearPortPower). If the port mask
is cleared, then the port is controlled only by the global power
switch (Set/ClearGlobalPower).
7 to 2
-
reserved
1 to 0
NDP[1:0]
NumberDownstreamPorts: These bits specify the number of
downstream ports supported by the Root Hub. The maximum
number of ports supported by the ISP1161A1 is 2.
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