www.pudn.com > Echo_Cancel.rar > 2191_EZ_KIT.h

#define     l       3000		/* transmission delay */ 
#define     m    	15          /* dispersive filter length */ 
#define     n       256        	/* adaptive filter length */ 
 
#define     delay   		50  /* short delay for canceller */ 
#define     delay_inc      100  /* delay increment */ 
 
/*  TX Config Register bits */ 
#define TSPEN       1                   /* Transmit enable */ 
#define ICLK        2                   /* internal clock */ 
#define ZERO_FILL   0 
#define SIGN_EXT    4 
#define MU_LAW      8 
#define A_LAW       0xC 
#define LSB_FIRST   0x10 
#define BITS16      0x1E0 
#define BITS8	    0x0E0 
#define ITFS        0x200               /* internal xmit frame sync */ 
#define TFSR        0x400               /* xmit frame sync required */ 
#define DITFS       0x800 
#define LTFS        0x1000              /* active low frame sync */ 
#define LATFS       0x2000              /* late frame sync */ 
#define CKRE        0x4000              /* sample data on rising edge of bitclk */ 
#define H100        0x8000              /* H100 compatability */ 
 
    
/*  Rx Config Register bits */ 
#define RSPEN       1                   /* rx enable */ 
#define IRFS        0x200               /* use internal frame sync */ 
#define RFSR        0x400               /* rx frame sync required */ 
#define LRFS        0x1000              /* active lo rx frame sync */ 
#define LARFS       0x2000              /* late rx frame sync */