Owners manual

Memory

DES0 is a notation used to denote the [31:0] bits, DES1 to denote [63:32] bits, DES2 to denote [95:64]bits, and DES3 to

denote [127:96]bits in a descriptor.

5.3.5.2. DES0 definition

Bits

Name

Descriptor

HOLD

DES_OWN_FLAG

When set, this bit indicates that the descriptor is owned by the IDMAC.

When this bit is reset, it indicates that the descriptor is owned by the

host. This bit is cleared when transfer is over.

ERROR

ERR_FLAG

When some error happened in transfer, this bit will be set.

29:6

Not used

Chain Flag

CHAIM_MOD

When set, this bit indicates that the second address in descriptor is the

next descriptor address. Must be set 1.

First DES Flag

FIRST_FLAG

When set, this bit indicates that this descriptor contains the first buffer

of data. Must be set to 1 in first DES.

Last DES Flag

LAST_FLAG

When set, this bit indicates that the buffers pointed to by this

descriptor are the last data buffer

Disable Interrupt on completion

CUR_TXRX_OVER_INT_DIS

When set, this bit will prevent the setting of the TX/RX interrupt bit of

the IDMAC status register for data that ends in the buffer pointed to by

this descriptor

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