GS2985 datasheet(29/45 Pages) SEMTECH

29 / 45 page

GS2985 Multi-Rate SDI Reclocker with Equalization &

De-emphasis

Data Sheet

36663 - 5

July 2012

29 of 45

Proprietary & Confidential

4.15.6 Write Operation - Single Device

A Write operation consists of a 16 bit command word and a 16 bit data word, followed

by 32 cycles with the slave SDI held HIGH. When writing to a single non-daisy chained

device, the following format should be used:

Figure 4-6: Single Device Write

1. At power-up, the device should be reset by setting the Reset bit low. A simple way

to accomplish a reset is to hold the slave SDI line low for an entire 64 cycle

communication.

2. For a Write operation, the R/W bit should be set to 0.

3. The 2nd and 3rd bits are Reserved and should be set to 0.

4. The Reset bit should always be set HIGH for a normal Write operation.

5. Refer to the Register Map for information on Address and Data bits.

6. The slave SDI line shall be held high for 32 cycles before de-asserting Chip Select

Bar.

4.15.7 Read Operation - Single Device

For Reading from a device the following format should be used:

Figure 4-7: Single Device Read

Command’ [15:0]

Data [15:0]

MOSI

Command [15:0]

Data High 32 cycles

A[4:0]

R/W

Reset

Address

C[6:0] = 0

Chain Position

16 bit command

Data [15:0]

Command [15:0]

Data [15:0]

MISO

MOSI

MISO

Command [15:0]

Data [15:0]

Command’ [15:0]

Data High 16 cycles

A[4:0]

R/W

Reset

Address

C[6:0] = 0

Chain Position

16 bit command

Data High 16 cycles

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