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| Ultra Fast USB 2.0 |
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BIT |
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NUMBER | BIT NAME | DESCRIPTION |
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5 | HS_DISABLE | |
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| device, and forces attachment as |
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| 0 = |
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| 1 = |
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4 | Reserved | Always reads ‘0’. |
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3 | EOP_DISABLE | EOP Disable: Disables EOP generation of EOF1 when in |
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| During FS operation only, this permits the hub to send EOP if no |
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| downstream traffic is detected at EOF1. See Section 11.3.1 of the USB 2.0 |
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| Specification for additional details. Note: generation of an EOP at the EOF1 |
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| point may prevent a Host Controller (operating in FS mode) from placing the |
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| USB bus in suspend. |
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| 0 = An EOP is generated at the EOF1 point if no traffic is detected. |
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| 1 = EOP generation at EOF1 is disabled (Note: This is normal USB |
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| operation). |
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| Note: This is a rarely used feature in the PC environment, existing drivers |
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| may not have been thoroughly debugged with this feature enabled. |
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| It is included because it is a permitted feature in Chapter 11 of the |
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| USB specification. |
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2:1 | CURRENT_SNS | |
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| ports ganged, or none (only for |
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| current sensing on a port or ganged basis is dependent upon the hardware |
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| implementation. |
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| 00 = Ganged sensing (all ports together) |
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| 01 = Individual |
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| 1x = |
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| Powered configurations!) |
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0 | PORT_PWR | Port Power Switching: Enables power switching on all ports simultaneously |
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| (ganged), or port power is individually switched on and off on a port- |
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| basis (individual). The ability to support power enabling on a port or ganged |
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| basis is dependent upon the hardware implementation. |
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| 0 = Ganged switching (all ports together) |
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| 1 = Individual |
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7.3.3.18E5h: Config Data Byte 2 (CFG_DAT_BYT2)
BIT |
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NUMBER | BIT NAME |
| DESCRIPTION |
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| |
7:6 | Reserved | Always reads ‘0’. | |
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| |
5:4 | OC_TIMER | OverCurrent Timer: | |
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| 00 | = 50 ns |
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| 01 | = 100 ns |
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| 10 | = 200 ns |
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| 11 = 400 ns | |
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Revision 2.0 | 38 | SMSC USB2640/USB2641 |
| DATASHEET |
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