BBT3821 Datasheet, PDF(74/75 Page) Intersil Corporation – Octal 2.488Gbps to 3.187Gbps/ Lane Retimer

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BBT3821 Datasheet, PDF (74/75 Pages) Intersil Corporation – Octal 2.488Gbps to 3.187Gbps/ Lane Retimer

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BBT3821

many TOSA, ROSA and lane-oriented DOM devices have

open-drain outputs that go high on an alarm condition, wire-

AND-ing these together for a four-lane indication is not

possible (any âworkingâ lane masks the âalarmedâ lane(s)),

some external gating may be required (typically a 4-input OR

or NOR gate per alarm). Note that the default polarity of

these alarm inputs (active high) will be set after power-up,

RESET or a hard (D.0.15) software reset, until the device is

reconfigured. If a host-driven configuration is being used, the

polarities (controlled by 1.C01D, Table 55) should be set

before the LASI enables (1.9002, Table 27). If the Auto-

Configure system is used (See âAuto-Configuring Control

Registersâ on page 16 and Table 92), the configuration may

take typically about 100 msec (see Figure 18 and Table 117),

and there will normally be a brief interval during which the

LASI interrupt is likely to be (incorrectly) activated. LASI host

operations would probably normally ignore such âglitchesâ,

since the Byte Synch and Lane Alignment will initially be in

âFaultâ condition after such a RESET (per the IEEE 802.3ae

specification), and so the relevant latched Local Fault

indications will need to be cleared before LASI is

meaningful, but it could be advisable to ensure that the

additional indications are ignored or cleared in the same way

before the full LASI system is activated.

FIGURE 25. VDDPR CLAMP CIRCUIT

P3V3

From MSA Conn

To BBT3821,

Pull-Up Resistors

VDDPR

10K

Cathode

Cathode D1

Reference

Anode

ZHCS400

12K

LMV431

VDD

FIGURE 26. RESISTIVE DIVIDER CIRCUITS

RAW_3V3

TX_FAULT

- - - etc. - - -

OPRXOP

Rpu Rpu

12K 12K

TX_FAULT_3P3

- - - etc.- - -

OPRXOP_3P3

Rpd Rpd

10k 10k

TX_FAULT

- - - etc. - - -

OPRXOP

Rpu

12K

Rpu

Rpd Rpd 12K

10K 10K

TX_FAULT_3P3

- - - etc. - - -

OPRXOP_3P3

RAW_3V3

TX_ENA#

Rpu

12K

TX_ENA3P3_#

Rpd

16K

18K for

MIC3000

RAW_3V3

Rpu

12K

SDA, SCL

- - - each- -

Rpd

SDA, SCL

30K

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