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LAN9252/ML データシート(PDF) 295 Page - Microchip Technology |
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LAN9252/ML データシート(HTML) 295 Page - Microchip Technology |
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295 / 329 page  2015 Microchip Technology Inc. DS00001909A-page 295 LAN9252 13.0 EEPROM INTERFACE The device contains an I2C master controller, which uses the EESCL and EESDA pins. EESCL and EESDA require an external pull-up resistor. Both 1 byte and 2 byte addressed EEPROMs are supported. The size is determined by the eeprom_size_strap. 13.1 I2C Interface Timing Requirements This section specifies the I2C master interface input and output timings. The I2C master interface runs in fast-mode with a rate of 148.8 kHz. Note 41: These values provide 400 ns of margin compared to the I2C fast-mode specification. Note 42: These values provide ~2100 ns of margin compared to the I2C fast-mode specification. Note 43: These values provide 300 ns of setup margin and 400 ns of hold margin compared to the I2C fast-mode specification. FIGURE 13-1: I2C MASTER TIMING DIAGRAM TABLE 13-1: I2C MASTER TIMING VALUES Symbol Description Min Typ Max Units fscl EESCL clock frequency - 148.8 - kHz thigh EESCL high time 3.0 - - s tlow EESCL low time 3.0 - - s tr Rise time of EESDA and EESCL -300 ns tf Fall time of EESDA and EESCL -300 ns tsu;sta Setup time (provided to slave) of EESCL high before EESDA output falling for repeated start condition 1000 Note 41 -- ns thd;sta Hold time (provided to slave) of EESCL after EESDA output fall- ing for start or repeated start condition 1000 Note 41 -- ns tsu;dat;in Setup time (from slave) EESDA input before EESCL rising 200 Note 42 -- ns thd;dat;in Hold time (from slave) of EESDA input after EESCL falling 0 - - ns tsu;dat;out Setup time (provided to slave) EESDA output before EESCL rising 400 Note 42 -- ns thd;dat;out Hold time (provided to slave) of EESDA output after EESCL fall- ing 400 Note 42 -- ns tsu;sto Setup time (provided to slave) of EESCL high before EESDA output rising for stop condition 1000 Note 41 -- ns EESDA (out) EESCL S P Sr tf tr thd;sta thd;dat;in tsu;dat;in tsu;sta tsu;sto EESDA (in) thigh tlow thd;dat;out tsu;dat;out |
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