DS26519G datasheet(38/310 Pages) MAXIM

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DS26519 16-Port T1/E1/J1 Transceiver

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9.3

Resets and Power-Down Modes

A hardware reset is issued by forcing the

RESETB pin to logic low. The RESETB input pin resets all framers, LIUs,

and BERTs. Note that not all registers are cleared to 00h on a reset condition. The register space must be

reinitialized to appropriate values after a hardware or software reset has occurred. This includes writing

reserved locations to 00h.

Table 9-2. Reset Functions

RESET FUNCTION

LOCATION

COMMENTS

Hardware Device Reset

RESETB Pin

Transition to a logic 0 level resets the DS26519.

Hardware JTAG Reset

JTRST Pin

Resets the JTAG test port.

Global Software Reset

GSRR1, GSRR2

Writing to these registers resets the framers, LIUs and

BERTs (transmit and receive).

Framer Receive Reset

RMMR.1

Writing to this bit resets the receive framer.

Framer Transmit Reset

TMMR.1

Writing to this bit resets the transmit framer.

HDLC Receive Reset

RHC.6

Writing to this bit resets the receive HDLC controller.

HDLC Transmit Reset

THC1.5

Writing to this bit resets the transmit HDLC controller.

Elastic Store Receive Reset

RESCR.2

Writing to this bit resets the receive elastic store.

Elastic Store Transmit Reset

TESCR.2

Writing to this bit resets the transmit elastic store.

Bit Oriented Code Receive

Reset

T1RBOCC.7

Writing to this bit resets the receive BOC controller.

Loop Code Integration Reset

T1RDNCD1,

T1RUPCD1

Writing to these registers resets the programmable in-band

code integration period.

Spare Code Integration Reset

T1RSCD1

Writing to this register resets the programmable in-band

code integration period.

The DS26519 has several features included to reduce power consumption. The individual LIU transmitters can be

powered down by setting the TPDE bit in the LIU Maintenance Control Register (LMCR). Note that powering down

the transmit LIU results in a high-impedance state for the corresponding TTIPn and TRINGn pins and reduced

operating current. The RPDE in the LMCR register can be used to power down the LIU receiver.

The TE (transmit enable) bit in the LMCR register can be used to disable the TTIPn and TRINGn outputs and place

them in a high-impedance mode, while keeping the LIU in an active state (powered up). This is useful for

equipment protection-switching applications.

DS26519G Datasheet(PDF) 38 Page - Maxim Integrated Products

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