Rainbow-electronics MAX1329 Manual de usuario descargar pdf (Pagina 51)

MAX1329/MAX1330

12-/16-Bit DASs with ADC, DACs, DPIOs, APIOs,

Reference, Voltage Monitors, and Temp Sensor

______________________________________________________________________________________ 51

FIFOA Data Register

The FIFOA Data register stores up to 16 12-bit words that

can be used by DACA to generate a waveform.

FFADATA<11:0>: FIFOA Data bits (default = 0xXXX).

FFADATA<11:0> represents a 12-bit word that is left

justified with 4 don’t-care LSBs. A write or read opera-

tion always starts at location 1 and ends at the full FIFO

depth. Any attempt to write past the full FIFO depth

does not overwrite the data just written. Any attempt to

read past the full FIFO depth returns zeroes on DOUT.

A write to the FIFOA Data register is possible only when

the FFAE bit in the FIFOA Control register is 0. If FFAE

= 1, any write to the FIFOA Data register is ignored. A

read command is possible at any time. If BIPA = 0, the

data is interpreted as binary (0 to 4095). If BIPA = 1,

the data is interpreted as sign magnitude (-2047 to

+2047). In sign magnitude, the MSB represents the

sign bit, where 0 indicates a positive number and 1

indicates a negative number. The 11 LSBs provide the

magnitude in sign magnitude.

Table 17. DACA FIFO Depth Bit

Configuration

DPTA3 DPTA2 DPTA1 DPTA0 FIFOA DEPTH

0000 1

0001 2

0010 3

0011 4

0100 5

0101 6

0110 7

0111 8

1000 9

1001 10

1010 11

1011 12

1100 13

1101 14

1110 15

1111 16

MSB

NAME FFADATA11 FFADATA10 FFADATA9 FFADATA8 FFADATA7 FFADATA6 FFADATA5 FFADATA4

DEFAULT 00000000

LSB

NAME FFADATA3 FFADATA2 FFADATA1 FFADATA0 XXXX

DEFAULT 0000XXXX

X = Don’t care.

1 2 ... 46 47 48 49 50 51 52 53 54 55 56 ... 77 78

MAX1329/MAX1330 1

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