DS2155 datasheet(11/238 Pages) DALLAS

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DS2155

11 of 238

Flexible signaling support

–

Software or hardware based

–

Interrupt generated on change of signaling data

–

Receive signaling freeze on loss-of-sync,

carrier loss, or frame slip

Addition of hardware pins to indicate carrier loss

and signaling freeze

Automatic RAI generation to ETS 300 011

specifications

Access to Sa and Si bits

Option to extend carrier loss criteria to a 1ms

period as per ETS 300 233

Japanese J1 support

–

Ability to calculate and check CRC6 according

to the Japanese standard

–

Ability to generate Yellow Alarm according to

the Japanese standard

TDM Bus

Dual two-frame independent receive and transmit

elastic stores

–

Independent control and clocking

–

Controlled slip capability with status

–

Minimum delay mode supported

16.384MHz maximum backplane burst rate

Supports T1 to CEPT (E1) conversion

Programmable output clocks for fractional T1, E1,

H0, and H12 applications

Interleaving PCM bus operation

Hardware signaling capability

–

Receive signaling reinsertion to a backplane

multiframe sync

–

Availability of signaling in a separate PCM

data stream

–

Signaling freezing

Ability to pass the T1 F-bit position through the

elastic stores in the 2.048MHz backplane mode

Access to the data streams in between the

framer/formatter and the elastic stores

User-selectable synthesized clock output

HDLC Controllers

Two independent HDLC controllers

Fast load and unload features for FIFOs

SS7 support for FISU transmit and receive

Independent 128-byte Rx and Tx buffers with

interrupt support

Access FDL, Sa, or single/multiple DS0 channels

DS0 access includes Nx64 or Nx56

Compatible with polled or interrupt driven

environments

Bit-oriented code (BOC) support

Test and Diagnostics

Programmable on-chip bit error-rate testing

Pseudorandom patterns including QRSS

User-defined repetitive patterns

Daly pattern

Error insertion single and continuous

Total bit and errored bit counts

Payload error insertion

Error insertion in the payload portion of the T1

frame in the transmit path

Errors can be inserted over the entire frame or

selected channels

Insertion options include continuous and absolute

number with selectable insertion rates

F-bit corruption for line testing

Loopbacks: remote, local, analog, and per-channel

loopback

Extended System Information Bus

Host can read interrupt and alarm status on up to 8

ports with a single bus read

User-Programmable Output Pins

Four user-defined output pins for controlling

external logic

Control Port

8-bit parallel control port

Multiplexed or nonmultiplexed buses

Intel or Motorola formats

Supports polled or interrupt environments

Software access to device ID and silicon revision

Software reset supported

–

Automatic clear on power-up

Hardware reset pin

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