3

AT97SC3203S

5132AS–TPM–1/07

Description (continued)

Communication to and from the TPM occurs through a modified 100-kHz SMBus two-

wire interface. The TPM includes a hardware random number generator, including a

FIPS-approved Pseudo Random Number Generator, that is used for key generation and

TCG protocol functions. The RNG is also available to the system to generate random

numbers that may be needed during normal operation.

The chip uses a dynamic internal memory management scheme to store multiple RSA

keys. Other than the standard TCG commands (TPM_FlushSpecific, TPM_Loadkey2),

no system intervention is required to manage this internal key cache.

Full documentation for TCG primitives can be found on the TCG Web site located at

and SMBus protocol information