PM7375-SC datasheet(29/430 Pages) PMC

29 / 430 page

PM7375 LASAR-155

DATA SHEET

PMC-931127

ISSUE 6

LOCAL ATM SAR & PHYSICAL LAYER

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

RCLK

Output

The receive clock (RCLK) output provides a timing

reference for the LASAR-155 receive line interface

outputs. RCLK is a 19.44 MHz or 6.48 MHz, nominally

50% duty cycle clock. RCLK is a divide by eight of the

recovered clock or the RRCLK+/- inputs as

determined using the RBYP bit in the LASAR-155

Master Configuration register.

RALM

Output

157

The receive alarm (RALM) output indicates the state

of the receive framing. RALM is low if no receive

alarms are active. RALM is high if loss of signal

(LOS), line AIS, path AIS, loss of frame (LOF), loss of

pointer (LOP) or loss of cell delineation (LCD) is

detected. RALM is updated on the falling edge of

RCLK.

RFP

Output

109

The receive frame pulse (RFP) output is an 8 kHz

signal derived from the receive line clock. RFP is

pulsed high for one RCLK cycle every 2430 RCLK

cycles for STS-3c (STM-1) or every 810 RCLK cycles

for STS-1. A single discontinuity in RFP position

occurs if a change of frame alignment occurs.

TRCLK+

TRCLK-

PECL

Input

120

121

The transmit differential reference clock inputs

(TRCLK+, TRCLK-) are a jitter-free 19.44 MHz or 6.48

MHz reference clock when clock synthesis is enabled.

When clock synthesis is bypassed, TRCLK+/- is

nominally a 155.52 MHz or 51.84 MHz, 50% duty

cycle clock. This clock provides timing for the

LASAR-155 transmit functions. TRCLK+/- may be left

unconnected when LASAR-155 loop timing is enabled

using the LASAR-155 Master Control Register.

TXC

Output

125

The transmit clock (TXC) output is available when

STS-1 (51.84 Mbits/s) mode of operation is selected

using the LASAR-155 Master Configuration register.

When STS-3c (STM-1) mode of operation is selected,

TXC is held low. TXD+/- are updated on the falling

edge of TXC.

PM7375-SC Datasheet(PDF) 29 Page - PMC-Sierra, Inc

PM7375-SC Datasheet(HTML) 29 Page - PMC-Sierra, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL