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参数资料
| 型号： | MC141556P |
| 厂商： | MOTOROLA INC |
| 元件分类： | 总线控制器 |
| 英文描述： | UNIVERSAL SERIAL BUS CONTROLLER, PDIP28 |
| 封装： | PLASTIC, DIP-28 |
| 文件页数： | 16/18页 |
| 文件大小： | 159K |
| 代理商： | MC141556P |
MC141556
7
MOTOROLA
DP5/SEL1 (Pin 27)
When IIC Mode: this pin acts as differential data plus I/O
pin of downstream port 5 for internal use; that is, there are
no PWRSW5 and OVR5 for downstream port 5.
When non IIC Mode: in Initialization, this pin, along with
SEL0 and OVR5, determines Power Mode and Power Con-
trol Mode. (refer to Table1 for detail) After Initialization, if
self-powered, this pin is differential data plus I/O pin of
downstream port 5.
DM5/SEL0 (Pin 28)
When IIC Mode: this pin acts as differential data minus I/
O pin of downstream port 5 for internal use; that is, there are
no PWRSW5 and OVR5 for downstream port 5.
When non-IIC Mode: in initialization, this pin, along with
SEL1 and OVR5, determines Power Mode and Power Con-
trol Mode. (refer to Table1 for detail) After initialization, if
self-powered, this pin is differential data minus I/O pin of
downstream port 5; if bus-powered, pull this pin high.
SYSTEM DESCRIPTION
MC141556 is booted up from the Power-On Reset which
will initialize all the internal hardware circuitry and reset the
program counter of the internal processor. During Power-On
Reset, MC141556 must be set to the desired configuration
by the input states of the pins IICEN, OVR5/GANG/SCL,
PWRSW5/SDA, DP5/SEL1 and DM5/SEL0. See Table1
Configuration Selection for detail.
After Power-On, the Hub Repeater will handle the con-
nectivity in per packet basis, and all downstream ports tran-
sition to the powered off state. After all initialization, the Hub
Controller takes over the responsibility for receiving Host’s
commands, Downstream Power Management and to report
status in per port basis while Repeater is detecting the con-
nectivity of each downstream port.
MC141556 accepts the Host Reset request to generate a
per port reset and receives reset signalling from root port to
complete its own reset sequence.
HUB CONFIGURATION
MC141556 can be configured as one of the four operating
modes: IIC Mode, Self Power Mode with Individual Control,
Bus Power Mode with Individual Control, Bus Power Mode
with Ganged Control.
(a) IIC Mode
During Power-On Reset, pull IICEN pin high to select this
mode. OVR5/GANG/SCL acts as SCL which is the synchro-
nizing clock input from the transmitter for IIC protocol.
PWRSW5/SDA acts as SDA which is the uni-directional data
line for IIC protocol.
In this mode, Vendor ID, Product ID, Powered Mode,
Number of Downstream Ports, Power Management Mode
and Debounce Setting are programmable by an external
MCU.
If MC141556 is programmed as a five-downstream-port
hub, DP5/SEL1 acts as the differential data plus I/O pin of
downstream port 5, and DM5/SEL0 as the differential data
minus I/O pin. OVR5/GANG/SCL acts as the SCL line for IIC
communication, and PWRSW5/SDA acts as SDA line for IIC
communication.
If MC141556 is programmed as a four-downstream-port
hub, DP5/SEL1 and DM5/SEL0 have no further usage.
OVR5/GANG/SCL and PWRSW5/SDA are dedicated to IIC
communication.
(b) Self-powered Mode with Individual control
(Monitor Application)
During Power-On Reset, pull IICEN, DP5/SEL1 and DM5/
SEL0 low to select this mode. Meanwhile, MC141556 is con-
figured to be self-powered with 5 downstream ports whose
power management is in Individual control; that is, after
Power-On Reset, DP5/SEL1 acts as DP5, DM5/SEL0 acts
as DM5, OVR5/GANG/SCL acts as OVR5 and PWRSW5/
SDA acts as PWRSW5.
(c) Bus-powered Mode with Individual control
During Power-On Reset, pull IICEN and DP5/SEL1 low,
pull OVR5/GANG/SCL and DM5/SEL0 high to select this
mode. Meanwhile, MC141556 is configured to be bus-pow-
ered with 4 downstream ports whose power management is
in Individual control; that is, after Power-On Reset, DP5/
SEL1, DM5/SEL0, OVR5/GANG/SCL and PWRSW5/SDA
have no further usage.
(d) Bus-powered Mode with Ganged control
During Power-On Reset, pull IICEN, DP5/SEL1 and
OVR5/GANG/SCL low, pull DM5/SEL0 high to select this
mode. Meanwhile, MC141556 is configured to be bus- pow-
ered with 4 downstream ports whose power management is
in Ganged control. In this mode, only PWRSW1 and OVR1
are dedicated to power management for all the 4 down-
stream ports.
All the four operating modes, with pin input states during
Power-On Reset, are summarized in Table1 .
Table 1. Configuration Selection
X: don’t care
DESCRIPTOR
IICEN
DP5/
SEL1
DM5/
SEL0
PWRSW5/
SDA
OVR5/
GANG
/SCL
Configuration
1
X
SDA
SCL
IIC Mode
0
PWRSW5
OVR5
Self-powered & Indi-
vidual control
0
1
X
1
Bus-powered & Indi-
vidual control
0
1
X
0
Bus-powered & Ganged
control
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