Industrial Temperature Rated USB 2.0
Datasheet
Table 3.1 USB2512i Pin Descriptions (continued)
| BUFFER |
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SYMBOL | EMB | TYPE | DESCRIPTION |
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| SERIAL PORT INTERFACE | |
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SDA/ | 22 | I/OSD12 | Serial Data / SMB Data & Port Non Removable Strap Option |
SMBDATA/ |
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| NON_REM1: Non removable port strap |
NON_REM1 |
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| option. |
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| If this strap is enabled by package and configuration settings |
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| (see Table 3.2), this pin will be sampled (in conjunction |
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| with LOCAL_PWR/SUSP_IND/NON_REM0) at RESET_N |
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| negation to determine if imports [2:1] contain permanently |
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| attached |
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| NON_REM[1:0] = ‘00’, All ports are removable. |
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| NON_REM[1:0] = ‘01’, Port 1 is nonremovable. |
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| NON_REM[1:0] = ‘10’, Ports 1 & 2 are |
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| NON_REM[1:0] = ‘11’, Ports 1 & 2 are |
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SCL/ | 24 | I/OSD12 | Serial Clock (SCL) |
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SMBCLK/ |
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| SMBus Clock (SMBCLK) |
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CFG_SEL0 |
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| Configuration Select_SEL0: The logic state of this multifunction |
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| pin is internally latched on the rising edge of RESET_N |
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| (RESET_N negation), and will determine the hub configuration |
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| method as described in Table 3.2, "SMBus or EEPROM |
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HS_IND/ | 25 | I/O12 | |
CFG_SEL1 |
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| Programming Select |
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| HS_IND: High Speed Indicator for upstream port connection |
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| speed. |
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| The active state of the LED will be determined as follows: |
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| CFG_SEL1 = ‘0’, |
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| HS_IND is active high, |
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| CFG_SEL1 = ‘1’, |
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| HS_IND is active low, |
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| ‘Asserted’ = Hub is connected at HS |
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| ‘Negated’ = Hub is connected at FS |
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| CFG_SEL1: The logic state of this pin is internally latched on |
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| the rising edge of RESET_N (RESET_N negation), and will |
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| determine the hub configuration method as described in |
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| MISC |
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XTAL1/ | 33 | ICLKx | Crystal Input/External Clock Input |
CLKIN |
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| 24MHz crystal or external clock input. |
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| This pin connects to either one terminal of the crystal or to an |
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| external 24MHz clock when a crystal is not used. |
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SMSC USB2512i | 9 | Revision 1.92 |
| DATASHEET |
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