AFE5804 datasheet(40/60 Pages) TI

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LVDS TEST PATTERNS

AFE5804

SBOS442A – JUNE 2008 – REVISED SEPTEMBER 2008 ................................................................................................................................................ www.ti.com

ADDRESS

IN HEX

D15

D14

D13

D12

D11

D10

NAME

EN_RAMP

DUALCUSTOM_PAT

SINGLE_CUSTOM_PAT

BITS_CUSTOM1<11:10>

BITS_CUSTOM2<11:10>

BITS_CUSTOM1<9:0>

BITS_CUSTOM2<9:0>

PAT_DESKEW

PAT_SYNC

The AFE5804 can output a variety of test patterns on the LVDS outputs. These test patterns replace the normal

ADC data output. Setting EN_RAMP to '1' causes all the channels to output a repeating full-scale ramp pattern.

The ramp increments from zero code to full-scale code in steps of 1LSB every clock cycle. After hitting the

full-scale code, it returns back to zero code and ramps again.

The device can also be programmed to output a constant code by setting SINGLE_CUSTOM_PAT to '1', and

programming the desired code in BITS_CUSTOM1<11:0>. In this mode, BITS_CUSTOM<11:0> take the place of

the 12-bit ADC data at the output, and are controlled by LSB-first and MSB-first modes in the same way as

normal ADC data are.

The device may also be made to toggle between two consecutive codes by programming DUAL_CUSTOM_PAT

to '1'. The two codes are represented by the contents of BITS_CUSTOM1<11:0> and BITS_CUSTOM2<11:0>.

In addition to custom patterns, the device may also be made to output two preset patterns:

1. Deskew patten: Set using PAT_DESKEW, this mode replaces the 12-bit ADC output D<11:0> with the

010101010101 word.

2. Sync pattern: Set using PAT_SYNC, the normal ADC word is replaced by a fixed 111111000000 word.

Note that only one of the above patterns should be active at any given instant.

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