DS2182N Просмотр технического описания (PDF) - Maxim Integrated

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производитель

DS2182N

T1 Line Monitor Chip

Maxim Integrated 

Figure 2. Serial Port Read/Write

DS2182A T1 Line Monitor Chip

NOTE 1: SDI IS SAMPLED ON RISING EDGE OF SCLK.

NOTE 2: SDO IS UPDATED ON FALLING EDGE OF SCLK.

OPERATION OF THE COUNTERS

All four of the counters in the DS2182A can be preset by the user to establish an event-count interrupt threshold.

The counters count up from the preset value until they reach saturation. At saturation, each additional event

occurrence sets the appropriate bit in RSR2 and generates an interrupt if enabled by RIMR2.

The DS2182A contains an auto-counter reset feature in the burst read mode. If RCR1.4 is set, then the user can

burst read the four counters (five registers), and all four counters are automatically reset to 0 after the read takes

place. Since the burst mode can be terminated at any time by taking CS high, the user has the option of reading all

of the registers or only the counters. If RCR1.4 is set, then any read of the registers, burst mode or not, clears the

count in all four counters. If the user wishes to read the port and not clear the counters, then RCR1.4 must be

cleared first.

The counter registers can be read or written to at any time with the serial port, which operates totally

asynchronously with the monitoring of the T1 line. Reading a register does not affect the count as long as RCR1.4

is cleared. The dual buffer architecture of the DS2182A ensures that no error events are missed while the serial

port is being accessed for reads.

BVCR1: Bipolar Violation Count Register 1; BVCR2: Bipolar Violation Counter Register 2

MSB

LSB

BV7

BV6

BV5

BV4

BV3

BV2

BV1

BV0

NAME

BV7

BV0

POSITION

BVCR.7

BVCR.0

FUNCTION

MSB of bipolar violation count

LSB of bipolar violation count

Bipolar violation count register 1 (BVCR1) is the most significant word and BVCR2 is the least significant word of a

presettable 16-bit counter that records individual bipolar violations. If the B8ZS mode is enabled (RCR2.2 = 1), then

B8ZS codewords are not counted. The BVCR can also be programmed to count excessive 0’s by setting the

RCR2.5 bit. In this mode, the BVCR counts occurrences of eight consecutive 0’s when B8ZS is enabled or 16

consecutive 0’s when B8Z5 is disabled. This counter increments at all times and is not disabled by a loss-of-sync

condition (RLOS = 1). The counter saturates at 65,535 and generates an interrupt for each occurrence after

saturation if RIMR2.0 is set.

Note: To properly preset the bipolar violation count register, BVCR2 must be written to before BVCR1 is written to.

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