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USB2504 bảng dữ liệu(PDF) 21 Page - Microchip Technology

tên linh kiện USB2504
Giải thích chi tiết về linh kiện  Integrated USB 2.0 Compatible 4-Port Hub
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nhà sản xuất  MICROCHIP [Microchip Technology]
Trang chủ  http://www.microchip.com
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USB2504 bảng dữ liệu(HTML) 21 Page - Microchip Technology

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 2007 - 2016 Microchip Technology Inc.
DS000002250A-page 21
USB2504/USB2504A
5.3.5
STRETCHING THE SCLK SIGNAL
The Hub supports stretching of the SCLK by other devices on the SMBus. The Hub does not stretch the SCLK.
5.3.6
SMBUS TIMING
The SMBus Slave Interface complies with the SMBus AC Timing Specification. See the SMBus timing in the “Timing
Diagram” section.
5.3.7
BUS RESET SEQUENCE
The SMBus Slave Interface resets and returns to the idle state upon a START field followed immediately by a STOP
field.
5.3.8
SMBUS ALERT RESPONSE ADDRESS
The SMBALERT# signal is not supported by the Hub.
5.3.9
INTERNAL SMBUS MEMORY REGISTER SET
The following table provides the SMBus slave interface register map values.
Note:
Some simple devices do not contain a clock low drive circuit; this simple kind of device typically resets its
communications port after a start or stop condition.
TABLE 5-4:
SMBUS SLAVE INTERFACE REGISTER MAP
Reg
Addr
R/W
Register Name
Abbr
Bit 7
(MSb)
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
(LSb)
00h
R/W
Status/Command
STCD
7
6
5
4
3
2
1
0
01h
R/W
VID LSB
VIDL
7
6
5
4
3
2
1
0
02h
R/W
VID MSB
VIDM
7
6
5
4
3
2
1
0
03h
R/W
PID LSB
PIDL
7
6
5
4
3
2
1
0
04h
R/W
PID MSB
PIDM
7
6
5
4
3
2
1
0
05h
R/W
DID LSB
DIDL
7
6
5
4
3
2
1
0
06h
R/W
DID MSB
DIDM
7
6
5
4
3
2
1
0
07h
R/W
Config Data Byte 1
CFG1
7
6
5
4
3
2
1
0
08h
R/W
Config Data Byte 2
CFG2
7
6
5
4
3
2
1
0
09h
R/W
Non-Removable
Devices
NRD
7
6
5
4
3
2
1
0
0Ah
R/W
Port Disable (Self)
PDS
7
6
5
4
3
2
1
0
0Bh
R/W
Port Disable (Bus)
PDB
7
6
5
4
3
2
1
0
0Ch
R/W
Max Power (Self)
MAXPS
7
6
5
4
3
2
1
0
0Dh
R/W
Max Power (Bus)
MAXPB
7
6
5
4
3
2
1
0
0Eh
R/W
Hub Controller Max
Current (Self)
HCMCS
7
6
5
4
3
2
1
0
0Fh
R/W
Hub Controller Max
Current (bus)
HCMCB
7
6
5
4
3
2
1
0
10h
R/W
Power-on Time
PWRT
7
6
5
4
3
2
1
0



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