DS2151 Просмотр технического описания (PDF) - Dallas Semiconductor -> Maxim Integrated

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Компоненты Описание

производитель

DS2151

T1 Single-Chip Transceiver

Dallas Semiconductor -> Maxim Integrated 

CCR1: COMMON CONTROL REGISTER 1 (Address=37 Hex)

(MSB)

TESE

LLB

RSAO

RLB

SCLKM RESE

PLB

SYMBOL

TESE

POSITION

CCR1.7

NAME AND DESCRIPTION

Transmit Elastic Store Enable.

0=elastic store is bypassed

1=elastic store is enabled

LLB CCR1.6 Local Loopback.

0=loopback disabled

1=loopback enabled

RSAO

CCR1.5

Receive Signaling All 1s.

0=allow robbed signaling bits to appear at RSER

1=force all robbed signaling bits at RSER to 1

RLB CCR1.4 Remote Loopback.

0=loopback disabled

1=loopback enabled

SCLKM

CCR1.3

SYSCLK Mode Select.

0=if SYSCLK is 1.544 MHz

1=if SYSCLK is 2.048 MHz

RESE

CCR1.2

Receive Elastic Store Enable.

0=elastic store is bypassed

1=elastic store is enabled

PLB CCR1.1 Payload Loopback.

0=loopback disabled

1=loopback enabled

FLB CCR1.0 Framer Loopback.

0=loopback disabled

1=loopback enabled

DS2151Q

(LSB)

FLB

LOCAL LOOPBACK

When CCR1.6 is set to a 1, the DS2151Q will be forced into Local LoopBack (LLB). In this loopback,

data will continue to be transmitted as normal through the transmit side of the SCT. Data being received

at RTIP and RRING will be replaced with the data being transmitted. Data in this loopback will pass

through the jitter attenuator and the jitter attenuator should be programmed to be in the transmit path.

LLB is primarily used in debug and test applications. Please see the DS2151Q Block Diagram in Section

1 for more details.

REMOTE LOOPBACK

When CCR1.4 is set to a 1, the DS2151Q will be forced into Remote LoopBack (RLB). In this loopback,

data recovered off the T1 line from the RTIP and RRING pins will be transmitted back onto the T1 line

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