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| 型號(hào)： | PM5352-B1 |
| 英文描述： | Interface IC |
| 中文描述： | 接口IC |
| 文件頁(yè)數(shù)： | 17/77頁(yè) |
| 文件大小： | 901K |
| 代理商： | PM5352-B1 |
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PM5352 S/UNI STAR
DATA SHEET
PMC-1990421
ISSUE 2
SATURN USER NETWORK INTERFACE 155 (STAR)
PROPRIETARY AND CONFIDENTIAL TO PMC-SIERRA, INC., AND FOR ITS CUSTOMERS’ INTERNAL USE
13
Pin Name
Type
Pin
No.
Function
TFPI
Input
Y7
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
Output
AB11
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.
TCLK
Output
AC11
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.
This Material Copyrighted by Its Respective Manufacturer
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