M08045 datasheet(34/49 Pages) MA-COM

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Functional Description

M08035, M08045 Data Sheet V1

MACOM

™

080x5-DSH-001

When SDALG is high it also sets the SD/xHD pin high when the reclocker is unlocked. This is used when the user

requires other SD rates such as 143 Mbps and 360 Mbps to be output from the cable driver with the slow SD edge

when the reclocker is not locked.

4.9

xALARM

The xALARM output pin is provided so the user can monitor alarm activity on the reclocker. The output is open

drain as shown in Figure 3-10. Table 4-12 shows the reclocker alarms and their function. The assertion of any of

the alarms in Table 4-12 will trigger xALARM.

The xAlarm pin may be used when the device is controlled using standard four-wire or two-wire serial interfaces

(SIC4 and SIC2). The xAlarm pin operates in an interrupt mode. It goes low on the assertion of any of the internal

alarm flags and stays low for a fixed period of time before returning to high (see Figure 4-9). This period is set by

the Interrupt Control register (0Eh). By default this is 0 and that corresponds to 20 ns. The maximum period is

2.560 µs, when INT[3:0] is set to Fh.

The xAlarm pin is designed to be connected to a microprocessor's interrupt pin. After the interrupt occurs, the

microprocessor can read the reclocker's alarm registers to determine which alarm was asserted.

Table 4-11.

SD/xHD Output Algorithm

Rate (Gbps)

SD/xHD Pin

SDALG Bit = 0

SDALG Bit = 1

0.270

1.485/1.4835

2.97/2.967

unlocked

NOTE:

Please note that xAlarm is not supported in hardware control mode (HIC).

Table 4-12.

Reclocker Alarm Function

Alarm

Function

LOS

Asserted when input signal goes below LOS threshold as set in register 06h.

LOL

Asserted when reclocker cannot lock to the incoming data.

NOREF

Asserted when no input reference is present at the reference clock inputs.

REFLOL

Asserted when frequency lock block cannot lock to the reference clock input.

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