TMS570LS3137: DMA Config Control Packet

Hello, where can I find the possible values that can be taken by the codes written below. I mean, I want to learn how to determine the values. For example, g_dmaCTRLPKT.AUTOINIT  = AUTOINIT_ON can also be written as g_dmaCTRLPKT.AUTOINIT  = AUTOINIT_OFF. 

Is there any guide to understand these concepts and possible values that can be given? or, for instance, how is "element destination offset" used?

codes:

void dmaConfigCtrlPacket(uint32 sadd,uint32 dadd,uint32 dsize)
{

g_dmaCTRLPKT.SADD = sadd; /* source address */
g_dmaCTRLPKT.DADD = dadd; /* destination address */
g_dmaCTRLPKT.CHCTRL = 0; /* channel control */
g_dmaCTRLPKT.FRCNT = 1; /* frame count */
g_dmaCTRLPKT.ELCNT = dsize; /* element count */
g_dmaCTRLPKT.ELDOFFSET = 4; /* element destination offset */
g_dmaCTRLPKT.ELSOFFSET = 0; /* element destination offset */
g_dmaCTRLPKT.FRDOFFSET = 0; /* frame destination offset */
g_dmaCTRLPKT.FRSOFFSET = 0; /* frame destination offset */
g_dmaCTRLPKT.PORTASGN = 4; /* port b */
g_dmaCTRLPKT.RDSIZE = ACCESS_16_BIT; /* read size */
g_dmaCTRLPKT.WRSIZE = ACCESS_16_BIT; /* write size */
g_dmaCTRLPKT.TTYPE = FRAME_TRANSFER ; /* transfer type */
g_dmaCTRLPKT.ADDMODERD = ADDR_INC1; /* address mode read */
g_dmaCTRLPKT.ADDMODEWR = ADDR_OFFSET; /* address mode write */
g_dmaCTRLPKT.AUTOINIT = AUTOINIT_ON; /* autoinit */
}

thanks in advance :)