DS32EL0421, DS32ELX0421

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SNLS282F – MAY 2008 – REVISED APRIL 2013

Register Map

The register information for the serializer is shown in the table below. Some registers have been omitted or

marked as reserved; these are for internal testing and should not be written to. Some register bits require an

override bit to be set before they can be written to.

Addr

Name

Bits

Field

R/W

Default

Description

(Hex)

00

Device ID

7:1

SMBus Address

R/W

57'h

Some systems will use all 8 bits as the device ID. This will

shift the value from 57’h to AE’h

0

Reserved

0

01

Reset

7:5

Reserved

0

4

Analog Disable

R/W

0

1: Disables analog blocks. Power save feature

3:1

Reserved

0

0

Software Reset

0

1: Reset the device. Does not affect device ID.

02

GPIO0 Config

7:4

GPIO0 Mode

R/W

0

0000: GP out register

0001: Link loss indicator

0011: TxCLKIN loss of signal

0100: TxCLKIN detect

All others: Reserved

3:2

GPIO0 R Enable

R/W

01'b

00: Pullup/down disabled

01: Pulldown enabled

10: Pullup enabled

11: Reserved

1

Input Enable

R/W

0

0: Input buffer disabled

1: Input buffer enabled

0

Output Enable

R/W

1'b

0: OutputTtri-State™

1: Output enabled

03

GPIO1 Config

7:4

GPIO1 Mode

R/W

0

0000: Power on reset

0001: GP out register

0010: PLL lock indicator

0011: TxIN0 loss of signal

0100: TxIN1 loss of signal

0101: TxIN2 loss of signal

0110: TxIN3 loss of signal

0111: TxIN4 loss of signal

All others: Reserverd

3:2

GPIO1 R Enable

R/W

01'b

00: Pullup/down disabled

01: Pulldown enabled

10: Pullup enabled

11: Reserved

1

Input Enable

R/W

0

0: Input buffer disabled

1: Input buffer enabled

0

Output Enable

R/W

1'b

0: Output Tri-State™

1: Output enabled

04

GPIO2 Config

7:4

GPIO2 Mode

R/W

0

0000: GP out register

0001: Always on clock out

0010: Parallel-to-serial clock out

0100: Digital clock out

All others: Reserverd

3:2

GPIO2 R Enable

R/W

01'b

00: Pullup/down disabled

01: Pulldown enabled

10: Pullup enabled

11: Reserved

1

Input Enable

R/W

0

0: Input buffer disabled

1: Input buffer enabled

0

Output Enable

R/W

1'b

0: Output Tri-State™

1: Output enabled

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