CS8920A
4.3 Bus Interface Registers
Bus Interface Register:
Product Identification Code (Read only)
Address 0000h
Address 0001h
First byte of EISA registration
number for
Crystal Semiconductor
Second byte of EISA
registration number for
Crystal Semiconductor
Address: PacketPage base + 0000h
Address 0002h
Address 0003h
First 8 bits of
Product ID Number
Last 3 bits of the Product ID
number (5 "X" bits are the
revision number)
The Product Identification Code Register is located in the first four bytes of the PacketPage (0000h to 0003h).
The register contains a unique 32-bit product ID code that identifies the chip as belonging to the
CS8920/CS8920A family. The host can use this number to determine which software driver to load and to check
which features are available.
This register’s initial state after reset is: 0000 1110 0110 0011 0000 0000 011X XXXX
The X XXXX codes revision numbers are:
CS8920 revision B has code 0 0001.
CS8920 revision C has code 0 0010.
CS8920 revision D has code 0 0011.
CS8920A revisions A&B have code 0 0100.
CS8920A revision C has code 0 0101.
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DS238PP2