Texas Instruments TMS320C645x manual Bits of Serdescfgtx nCNTL Registers, Swing Bits, DE Bits

Models: TMS320C645x

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SRIO Functional Description

 

 

Table 10. Bits of SERDES_CFGTXn_CNTL Registers (continued)

Bit

Field

Value

Description

 

4:2

BUS-

 

Bus width. Selects the width of the parallel interface (10 or 8 bit).

 

WIDTH

000

10-bit operation. Data is input on TDn[9:0]. TXBCLKn period is 10 bit periods (4 high, 6 low).

 

 

 

 

001

8-bit operation. Data is input on TDn[9:2]. TXBCLKn period is 8 bit periods (4 high, 4 low).

 

 

 

TDn[1:0] are ignored.

 

 

 

01x

Reserved

 

 

 

1xx

Reserved

 

1

Reserved

 

Reserved

 

0

ENTX

 

Enable transmitter. Enables this transmitter when high.

 

 

 

Table 11. SWING Bits

 

CFGTX[11:9]

 

Amplitude (mVdfpp)

 

000

 

 

125

 

001

 

 

250

 

010

 

 

500

 

011

 

 

625

 

100

 

 

750

 

101

 

 

1000

 

110

 

 

1125

 

111

 

 

1250

 

 

 

 

Table 12. DE Bits

 

 

CFGTX[15:12]

Amplitude Reduction

 

 

 

 

%

dB

 

0000

 

0

0

 

0001

 

4.76

-0.42

 

0010

 

9.52

-0.87

 

0011

 

14.28

-1.34

 

0100

 

19.04

-1.83

 

0101

 

23.8

-2.36

 

0110

 

28.56

-2.92

 

0111

 

33.32

-3.52

 

1000

 

38.08

-4.16

 

1001

 

42.85

-4.86

 

1010

 

47.61

-5.61

 

1011

 

52.38

-6.44

 

1100

 

57.14

-7.35

 

1101

 

61.9

-8.38

 

1110

 

66.66

-9.54

 

1111

 

71.42

-10.87

SPRU976 –March 2006

Serial RapidIO (SRIO)

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Texas Instruments TMS320C645x manual Bits of Serdescfgtx nCNTL Registers, Swing Bits, DE Bits