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USB2503 bảng dữ liệu(PDF) 21 Page - Microchip Technology |
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USB2503 bảng dữ liệu(HTML) 21 Page - Microchip Technology |
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21 / 42 page ![]() 2007 - 2016 Microchip Technology Inc. DS000002249A-page 21 USB2503/USB2503A 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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