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. xxh - Crystal Semiconductor CS4920/CS4920A/CS4921/CS4922
Desc:	the CS4920A and CS4922 are MPEG audio decoders
Note:	the address to which the CS4922 responds must be programmed via 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; initially, the chip responds to any address
	after a reset, the 4922's DSP boot ROM(Read-Only Memory) A memory for program storage which may not be changed by the program as it runs. expects to have the RAM(Random Access Memory)	See also DRAM, SRAM. loaded
	  with a microprogram by sending data over 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. (see #I0065)


Format of Crystal Semiconductor microprogram data:
Offset	Size	Description	(Table I0121)
 00h	WORD	starting address in RAM(Random Access Memory)	See also DRAM, SRAM.
		high three bits ignored; bit 12 indicates program/data memory
		the CS4920A contains 4K words of program RAM(Random Access Memory)	See also DRAM, SRAM., 2K words data
		  RAM(Random Access Memory)	See also DRAM, SRAM. (of which the high 32 words are used by the debug prog.)
		the CS4922 contains 5K words of program RAM(Random Access Memory)	See also DRAM, SRAM., 3K words data RAM(Random Access Memory)	See also DRAM, SRAM.
 02h	WORD	length of block of data
 04h 3N BYTEs	sequence of 24-bit words of code or data
	...	(above may be repeated arbitrarily often)
	WORD	FFFFh end marker
      3 BYTEs	24-bit checksum (sum of all previous bytes)