AFE1302

6

SBWS014

FIGURE 2. AFE1302 Transmit/Receive Timing Diagram.

RX[0:3]/TX[0:3]

CLKM/CLKNIB

CLWD

N0

N1

t

S

t

H

N2

N3

NOTE: CLKM = 35.328; For N = 1, CLKNIB = 35.328MHz, CLWD = 8.832MHz; t

TRANSMIT DATA

Transmit data TX[0:3] passed to the AFE1302 will be

Binary Two’s Complement with one or two sign bits de-

pending on bit 9 in the AFE1302 control register at address

001 (see Table V). Bit 9 = 0 is two sign bits and bit 9 = 1

is one sign bit. Please refer to Tables I and II.

TABLE I. AFE1302 TX Data Format, Address 001, Bit 9 = 0.

BIT MAP\NIBBLE

N0

N1

N2

N3

TX0

data bit 0 (LSB)

data bit 4

data bit 8

data bit 12

TX1

data bit 1

data bit 5

data bit 9

data bit 13

TX2

data bit 2

data bit 6

data bit 10

data sign

TX3

data bit 3

data bit 7

data bit 11

data sign

TABLE II. AFE1302 TX Data Format, Address 001, Bit 9 = 1.

BIT MAP\NIBBLE

N0

N1

N2

N3

TX0

data bit 0 (LSB)

data bit 4

data bit 8

data bit 12

TX1

data bit 1

data bit 5

data bit 9

data bit 13

TX2

data bit 2

data bit 6

data bit 10 data bit 14

TX3

data bit 3

data bit 7

data bit 11

data sign

This corresponds to the internal data structure as follows:

TABLE III. AFE1302 RX Data Format, Address 001,

Bit 9 = 0.

BIT MAP\NIBBLE

N0

N1

N2

N3

RX0

data bit 0 (LSB)

data bit 4

data bit 8

data bit 12

RX1

data bit 1

data bit 5

data bit 9

data bit 13

RX2

data bit 2

data bit 6

data bit 10

data sign

RX3

data bit 3

data bit 7

data bit 11

data sign

This corresponds to the internal data structure as follows

(sign bit is repeated):

TABLE IV. AFE1302 RX Data Format, Address 001, Bit 9 = 1.

BIT MAP\NIBBLE

N0

N1

N2

N3

RX0

data bit 0 (LSB)

data bit 4

data bit 8

data bit 12

RX1

data bit 1

data bit 5

data bit 9

data bit 13

RX2

data bit 2

data bit 6

data bit 10 data bit 14

RX3

data bit 3

data bit 7

data bit 11

data sign

This corresponds to the internal data structure as follows:

This corresponds to the internal data structure as follows

(sign bit is repeated):

RECEIVE DATA

Data RX[0:3] received from the AFE1302 will be in the

format shown in Tables III and IV:

INTERNAL DATA BIT

15

14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

EXTERNAL DATA BIT

Sign Sign 13 12 11 10 9 8 7 6 5 4 3 2 1 0

INTERNAL DATA BIT

15

14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

EXTERNAL DATA BIT

Sign 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

INTERNAL DATA BIT

Sign Sign 13 12 11 10 9 8 7 6 5 4 3 2 1 0

EXTERNAL DATA BIT

15

14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

INTERNAL DATA BIT

Sign 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

EXTERNAL DATA BIT

15

14 13 12 11 10 9 8 7 6 5 4 3 2 1 0