PM5352 Просмотр технического описания (PDF) - PMC-Sierra

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PM5352

SATURN USER NETWORK INTERFACE (STAR)

PMC-Sierra 

DATA SHEET

PMC-1990421

Pin Name

TFPI

PM5352 S/UNI STAR

ISSUE 2

SATURN USER NETWORK INTERFACE 155 (STAR)

Type

Input

Pin

No.

Y7

Function

The active high framing position (TFPI) signal is an

8 kHz timing marker for the transmitter. TFPI is

used to align the SONET/SDH transport frame

generated by the S/UNI-STAR device to a system

reference. TFPI is internally used to align a master

frame pulse counter. When TFPI is not used, this

counter is free-running.

TFPI should be brought high for a single TCLK

period every 2430 (STS-3c (STM-1)) TCLK cycles,

or a multiple thereof. TFPI shall be tied low if such

synchronization is not required. TFPI cannot be

used as an input to a loop-timed channel. For TFPI

to operate correctly it is required that the

TCLK/TFPO output be configured to output the

CSU byte clock.

The TFPI_EN register bits allow use of the global

framing pulse counter and TFPI for framing

alignment.

TFPI is sampled on the rising edge of TCLK, but

only when the TTSEL register bit is set to logic zero.

When TTSEL is set to logic one, TFPI is unused.

TFPO

TCLK

Output

Output

AB11

AC11

The Transmit Frame Pulse Output (TFPO) pulses

high for one TCLK cycle every 2430 TCLK cycles

and provides an 8 KHz timing reference. TFPO can

be enabled using TFPO_CH[1:0] configuration

register bits, with the restriction that the device must

be self-timed (not in loop-timed or line-loopback

modes). TFPO is updated on the rising edge of

TCLK.

The transmit byte clock (TCLK) output provides a

timing reference for the S/UNI-STAR self-timed

channel. TCLK always provide a divide by eight of

the synthesized line rate clock and thus has a

nominal frequency of 19.44 MHz. TFPI is sampled

on the rising edge of TCLK. TCLK does not apply to

internally loop-timed channels, in which case RCLK

provides transmit timing information.

PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE 13

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