Notes:	An I2C(also IIC; the "2" is superscripted) Inter-Integrated Circuit Bus -- A moderate-speed serial communications bus originally invented by Philips in the early 1980s for consumer-electronics applications, such as inter-chip communication in a television set or high-end stereo.	 The I2C bus has recently appeared on PCs in video capture boards and similar devices, as well as (surprisingly) SDRAM DIMMs (for the on-board serial EEPROM).  The ACCESS.bus is a derivative of the I2C bus which forms the physical layer of the Universal Serial Bus.	 Similary, the SMBus (System Management Bus) also uses I2C as its physical layer. device uses two consecutive subaddresses; the low bit indicates
	  whether a read (bit 0 = 1) or write (bit 0 = 0) is being performed
	the header of each entry in this file indicates the device's subaddress
	  (the "slave address" in official terminology) and the register number
	  within the device; for certain indexed registers, the index value is
	  given as the third value in the entry header
	SMBus(System Management Bus) A derivative of the I2C bus used for communication between various components of a computer, such as smart batteries and their chargers.  In contrast to I2C, SMBus specifies fixed voltage levels (instead of relative to the power supply voltage) and a 10 KHz minimum clock rate (I2C minimum is 0).  SMBus also specifies several timings which are not required by I2C.  See also I2C, ACCESS.bus., ACCESS.busA further development of the I2C bus which forms the physical layer of the Universal Serial Bus.  Because ACCESS.bus is used for communication with external devices, it includes power and ground wires in addition to I2C's clock and data lines, and permits twice the current draw (6ma) on the clock and data lines.	see also I2C, SMBus., and the DDC2B data link to the monitor are all
	  variants of the I2C(also IIC; the "2" is superscripted) Inter-Integrated Circuit Bus -- A moderate-speed serial communications bus originally invented by Philips in the early 1980s for consumer-electronics applications, such as inter-chip communication in a television set or high-end stereo.	 The I2C bus has recently appeared on PCs in video capture boards and similar devices, as well as (surprisingly) SDRAM DIMMs (for the on-board serial EEPROM).  The ACCESS.bus is a derivative of the I2C bus which forms the physical layer of the Universal Serial Bus.	 Similary, the SMBus (System Management Bus) also uses I2C as its physical layer. bus, and are thus listed here as well.
	unless otherwise noted, all device registers are eight bits in size,
	  and may be both read and written
	the access method for communicating with an I2C(also IIC; the "2" is superscripted) Inter-Integrated Circuit Bus -- A moderate-speed serial communications bus originally invented by Philips in the early 1980s for consumer-electronics applications, such as inter-chip communication in a television set or high-end stereo.	 The I2C bus has recently appeared on PCs in video capture boards and similar devices, as well as (surprisingly) SDRAM DIMMs (for the on-board serial EEPROM).  The ACCESS.bus is a derivative of the I2C bus which forms the physical layer of the Universal Serial Bus.	 Similary, the SMBus (System Management Bus) also uses I2C as its physical layer. device is
	  implementation-dependent; for example, recent S3 chipsets supporting
	  the "Scenic Highway" Local Peripheral Bus access the I2C(also IIC; the "2" is superscripted) Inter-Integrated Circuit Bus -- A moderate-speed serial communications bus originally invented by Philips in the early 1980s for consumer-electronics applications, such as inter-chip communication in a television set or high-end stereo.	 The I2C bus has recently appeared on PCs in video capture boards and similar devices, as well as (surprisingly) SDRAM DIMMs (for the on-board serial EEPROM).  The ACCESS.bus is a derivative of the I2C bus which forms the physical layer of the Universal Serial Bus.	 Similary, the SMBus (System Management Bus) also uses I2C as its physical layer. bus via
	  bit-bangingThe process of sending data to or reading data from a serial device by raising and lowering a data line in the proper sequence (writing), or polling a data line and determining the bit sequence represented by the detected transitions and their timing.  It is equivalent to emulating a UART in software. of memory-mapped I/O register FF20h
	  (see MEM A000h:FF00h"S3").  On the Zoran ZR36057 used by the
	  Miro DC-30, the I2C(also IIC; the "2" is superscripted) Inter-Integrated Circuit Bus -- A moderate-speed serial communications bus originally invented by Philips in the early 1980s for consumer-electronics applications, such as inter-chip communication in a television set or high-end stereo.	 The I2C bus has recently appeared on PCs in video capture boards and similar devices, as well as (surprisingly) SDRAM DIMMs (for the on-board serial EEPROM).  The ACCESS.bus is a derivative of the I2C bus which forms the physical layer of the Universal Serial Bus.	 Similary, the SMBus (System Management Bus) also uses I2C as its physical layer. bus is accessed by bit-bangingThe process of sending data to or reading data from a serial device by raising and lowering a data line in the proper sequence (writing), or polling a data line and determining the bit sequence represented by the detected transitions and their timing.  It is equivalent to emulating a UART in software. memory-mapped
	  register 17 (at offset 0x44).	 On the Cirrus Logic GD7556, extended
	  sequencer register 8 is used (see #P0677).
	maximum data rates on the I2C(also IIC; the "2" is superscripted) Inter-Integrated Circuit Bus -- A moderate-speed serial communications bus originally invented by Philips in the early 1980s for consumer-electronics applications, such as inter-chip communication in a television set or high-end stereo.	 The I2C bus has recently appeared on PCs in video capture boards and similar devices, as well as (surprisingly) SDRAM DIMMs (for the on-board serial EEPROM).  The ACCESS.bus is a derivative of the I2C bus which forms the physical layer of the Universal Serial Bus.	 Similary, the SMBus (System Management Bus) also uses I2C as its physical layer. bus are also device-dependent; typical
	  maximum rates are 80 kHz (DIMMs), 100 kHz (VPX3220A), and 400 kHz.
	in DDC (Dislay Data Channel) 2B, the monitor's EDID info appears to be
	  stored in an EEPROM at the standard bus address of A0h; access to
	  the DDC clock/data lines is, however, chipset-specific.  On S3's
	  Trio64V+, the DDC lines share a port with the LPB's I2C(also IIC; the "2" is superscripted) Inter-Integrated Circuit Bus -- A moderate-speed serial communications bus originally invented by Philips in the early 1980s for consumer-electronics applications, such as inter-chip communication in a television set or high-end stereo.	 The I2C bus has recently appeared on PCs in video capture boards and similar devices, as well as (surprisingly) SDRAM DIMMs (for the on-board serial EEPROM).  The ACCESS.bus is a derivative of the I2C bus which forms the physical layer of the Universal Serial Bus.	 Similary, the SMBus (System Management Bus) also uses I2C as its physical layer. bus: when the
	  feature connector is disabled, they are connected to the monitor;
	  when enabled, the lines are connected to the Local Peripheral Bus	  
	I2C(also IIC; the "2" is superscripted) Inter-Integrated Circuit Bus -- A moderate-speed serial communications bus originally invented by Philips in the early 1980s for consumer-electronics applications, such as inter-chip communication in a television set or high-end stereo.	 The I2C bus has recently appeared on PCs in video capture boards and similar devices, as well as (surprisingly) SDRAM DIMMs (for the on-board serial EEPROM).  The ACCESS.bus is a derivative of the I2C bus which forms the physical layer of the Universal Serial Bus.	 Similary, the SMBus (System Management Bus) also uses I2C as its physical layer. FAQ: http://www.paranoia.com/%7Efilipg/HTML/LINK/ELE/F_I2C.html