MAX96708 datasheet(63/68 Pages) MAXIM

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UART Bypass Mode

In UART bypass mode, the control channel acts as a

full-duplex 9.6kbps to 1Mbps link that forwards UART

commands across the serial link without responding to

the packets themselves. Set MS high to enter bypass

mode (wait 1ms after setting bypass mode if the μC is

connected on the deserializer side). Bypass uses bit rates

from 9.6kbps to 1Mbps. Do not send a logic-low value

longer than 100μs when using the GPI/GPO functionality.

Device Address

The SerDes have a 7-bit-long slave address stored in

registers 0x00 and 0x01. The bit following a 7-bit slave

address is the R/W bit, which is low for a write command

and high for a read command. External inputs determine

the default slave address as shown in Table 8. After

startup, a μC can reprogram the slave address as needed.

Cable Equalizer

By default, the cable equalizer is enabled and set to

Adaptive mode. Set AEQ_EN = 0 to switch to manual EQ

mode. EQTUNE determines the boost level in manual EQ

mode (see Table 9). Set EN_EQ = 0 to disable all equal-

ization (manual or automatic).

The auto-equalization level is determined during serial-

link locking. Set AEQ_MAN_TRG_REQ = 1 to re-trigger

auto equalization. Set AEQ_PER_MODE = 1 to set up

periodic AEQ.

ERRB Output

The deserializer has an open-drain ERRB output. This

output asserts low whenever any of the following condi-

tions occur:

● The number of detected errors exceeds the error

thresholds during normal operation. Read DET_ERR,

set auto-error reset, or re-lock the link to clear.

● Exceeding the maximum number control channel

retries. Read MAX_RT_ERR to clear.

Additional conditions that set ERRB (disabled by default)

include:

● Insufficient boost at maximum boost setting

(set UNDERBST_DET_EN = 1). Retrigger the

equalization calibration to clear.

Auto-Error Reset

The default method to reset errors is to read the respec-

tive error counter registers in the deserializer. Auto-error

reset clears the error counters DET_ERR ~1μs after

ERR goes low. Auto-error reset is disabled on power-up.

Enable auto-error reset through AUTORST. Auto-error

reset does not run when the device is in PRBS test mode.

Table 8. Default-Device Address

ADD3

ADD2

ADD1

ADD0

R/W

Note: ADD[3:0] pin settings latched at power-up.

BOOST SETTING

(MANUAL AND ADAPTIVE

EQ)

TYPICAL BOOST GAIN AT

750MHZ (DB)

0000

1.6

0001

2.1

0010

2.8

0011

3.5

0100

4.3

0101

5.2

0110

6.3

0111

7.3

1000

8.5

1001

9.7

Power-up default for

Manual EQ*

1010

11.0

1011

12.2

Table 9. Cable-Equalizer Boost Levels

*Automatic EQ is enabled by default.

www.maximintegrated.com

Maxim Integrated │ 63

MAX96708

14-Bit GMSL Deserializer

with Coax or STP Cable Input

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