AD9680 datasheet(79/99 Pages) AD

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Data Sheet

AD9680

Rev. C | Page 77 of 97

CLK±

INPUT

SYSREF±

INPUT

VALID

REG 0x128[7:4]

FLIP-FLOP

HOLD (MIN)

FLIP-FLOP

HOLD (MIN)

FLIP-FLOP

SETUP (MIN)

0xF

0xE

0xD

0xC

0xB

0xA

0x9

0x8

0x7

0x6

0x5

0x4

0x3

0x2

0x1

0x0

Figure 173. SYSREF± Hold Detector

Table 28 shows the description of the contents of Register 0x128 and how to interpret them.

Table 28. SYSREF± Setup/Hold Monitor, Register 0x128

Hold Status

Setup Status

Description

0x0

0x0 to 0x7

Possible setup error. The smaller this number, the smaller the setup margin.

0x0 to 0x8

0x8

No setup or hold error (best hold margin).

0x8

0x9 to 0xF

No setup or hold error (best setup and hold margin).

0x8

0x0

No setup or hold error (best setup margin).

0x9 to 0xF

0x0

Possible hold error. The larger this number, the smaller the hold margin.

0x0

Possible setup or hold error.

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