2 buffer type descriptions, Buffer type descriptions, Table 6.2 – SMSC USB464 User Manual
Page 21
High Speed Inter-Chip USB 2.0 Hub and Flash Media Controller
Datasheet
SMSC USB4640/USB4640i
21
Revision 1.0 (06-01-09)
DATASHEET
6.2
Buffer Type Descriptions
Table 6.2 USB4640/USB4640i Buffer Type Descriptions
BUFFER
DESCRIPTION
I
Input.
I/O
Input/output.
IPU
Input with weak internal pull-up.
IS
Input with Schmitt trigger.
I/O6
Input/output buffer with 6 mA sink and 6 mA source.
I/OD6PU
Input/open drain output buffer with a 6 mA sink.
O8
Output buffer with an 8 mA sink and an 8 mA source.
O8PD
Output buffer with an 8 mA sink and an 8 mA source with a weak internal pull-down resistor.
O8PU
Output buffer with an 8 mA sink and an 8 mA source with a weak internal pull-up resistor.
I/O8
Input/output buffer with an 8 mA sink and an 8 mA source.
I/O8PD
Input/output buffer with an 8 mA sink and an 8 mA source with a weak internal pull-down resistor.
I/O8PU
Input/output buffer with an 8 mA sink and an 8 mA source with a weak internal pull-up resistor.
O12
Output buffer with a 12 mA sink and a 12 mA source.
I/O12
Input/output buffer with 12 mA sink and 12 mA source.
I/O12PD
Input/output buffer with 12 mA sink and 12 mA source with a weak internal pull-down resistor.
I/O200
Input/output buffer 12 mA with FET disabled, 100/200 mA source only when the FET is enabled.
ICLKx
XTAL clock input.
OCLKx
XTAL clock output.
I/O-U
Analog input/output as defined in the USB 2.0 Specification.
I-R
RBIAS.