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參數(shù)資料
| 型號： | 20H04 |
| 廠商： | SMSC Corporation |
| 英文描述： | 4-PORT USB2.0 HUB CONTROLLER |
| 中文描述： | 4端口USB2.0集線器控制器 |
| 文件頁數(shù)： | 12/38頁 |
| 文件大小： | 919K |
| 代理商： | 20H04 |
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4-Port USB2.0 Hub Controller
Datasheet
Revision 1.63 (10-14-04)
Page 12
SMSC USB20H04
DATASHEET
Chapter 4
Interface Signal Definition
4.1
Pin Descriptions
Table 4.1 - System Interface Signals
NAME
BUFFER
TYPE
IS
ACTIVE
LEVEL
Low
DESCRIPTION
RESET_N
Chip Reset
. The minimum active low pulse is 100ns. See section 8.4 for a
complete description of operation following a reset.
Self-power Detect
. Detects availability of local self-power source:
0: Self/local power source is NOT available (i.e., 4- Port Hub gets all power
from Upstream USB V
BUS
).
1: Self/local power source is available.
Test Pin.
Do Not Connect
Test Pin.
Do Not Connect
Test Pin.
Do Not Connect
Test Pin.
Do Not Connect
Test Pin.
Do Not Connect
SELF_PWR
I
High
TEST_P0
TEST_P1
TEST_P2
TEST_P3
ATEST
IPD
IPD
IPD
IPD
AO
N/A
N/A
N/A
N/A
N/A
Table 4.2 – Configuration Select and Serial Port Interface
NAME
BUFFER
TYPE
I
ACTIVE
LEVEL
N/A
DESCRIPTION
SMB_SEL_N
SMBus Select
. Selects between configuration via the SMBus interface, or
from an external EEPROM or using the internal default, as described in
the table below.
SMB_SEL_N
CS/EE_SEL
SMBus or EEPROM interface
configuration.
SMBus slave. Address: 0101100
SMBus slave. Address: 0101101
Internal default configuration.
2-wire EEPROM interface.
0
0
1
1
0
1
0
1
CS/EE_SEL
IO8
N/A
Chip Select
. This multifunction pin is sampled on the rising edge of
RESET_N. If SMB_SEL_N = 1, the internal default configuration will be
used when this pin is low, or the external I2C EEPROM will supply the
configuration when this pin is high. When SMB_SEL_N = 0, this pin
selects the SMBus slave address, as described in the table above.
Connect a 1k ohm resistor in series with the input when connecting this
pin to either VDD or VSS.
Serial Data
. Data I/O on the 2-Wire interface.
Serial Clock
. Clock for the 2-Wire interface.
SD/SDA
SCK/SCL
IOSD12
IOSD12
N/A
N/A
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