GS2986 datasheet(26/41 Pages) SEMTECH

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GS2986 Multi-Rate SDI Reclocker with Equalization &

De-emphasis

Data Sheet

52134 - 3

July 2012

26 of 41

4.15.5 Single Device Operation

For applications with a single device or applications with multiple devices where daisy

chaining is not desired, the chain position bits C[6:0] should always be set to 0. As a

by-product of the daisy chaining feature, Read and Write operations experience a 32

SCK cycle latency from SDI to SDO. For more details on daisy-chaining, refer to

Section 4.15.8 on page 29.

Figure 4-5: 16-bit Command Format

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 R 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 R 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 should be held HIGH for 32 cycles before de-asserting CS.

A[4:0]

Read/

Write

Reset

Address

C N[6:0] = `0000000’

Chain Position

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

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