Texas Instruments TMS320C6201 manual For big-endian mode

TMS320C6201 Silicon Errata SPRZ153

McBSP: DXR to XSR Copy Not Generated (Continued)

Example:

Configure the DMA as follows:

(a)For half-word/byte-size accesses with right justification on receive data:

–ch_A: /* for transmit */

src_address = mem_out; dst_address = DXR;

Element_size = WORDAddress_inc_mode = indexIndex_reg_value = 2 /* change this to 1 for byte writes */

–ch_B : /* for receive */

src_address = DRR; dst_address = mem_in;

Element_size = HALF /* change this to BYTE for 8-b element size */Address_inc_mode = inc_by_ element_size

/* inc_by_index whose value is as specified for ch_A above will also work */

(b)For half-word / byte-size accesses with left justification on receive data:

–Same as 1(a) above EXCEPT for:

ch_B : /* for receive */

src_address = DRR+3; /* for byte accesses */ OR = DRR+2; /* for half-word accesses */

2. For big-endian mode:

Always write 32 bits to the DXR.

(a)For half-word accesses with right justification on receive data:

–ch_A: /* for transmit */ src_address = mem_out;

dst_address = DXR+2; /* 0x018C0006 for McBSP0 or 0x01900006 for McBSP1 */

Element_size = WORD Address_inc_mode = index Index_reg_value = 2

–ch_B : /* for receive */

src_address = DRR+2 /* 0x018C0002 for McBSP0 or 0x01900002 for McBSP1 */ dst_address = mem_in;

Element_size = HALF;

Address_inc_mode = = inc_by_ element_size

/* inc_by_index whose value is as specified for ch_A above will also work */

(b)For half-word writes with left justification on receive data:

–Same as 2(a) above EXCEPT for: ch_B : /* for receive */ src_address = DRR;

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