PM8621 PMC-Sierra, Inc., PM8621 Datasheet - Page 27

• Manufacturer Part Number: PM8621
• Description: NSE-8G Standard Product Data Sheet Preliminary
• Manufacturer: PMC-Sierra, Inc.

Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2010850, Issue 1
Pad Name
RC1FP
Reserved
CMP
RSTB
Type
Input
Output
Input
Input
Pin No.
D16
C17
D10
B18
Function
Receive Serial Interface Frame Pulse. The receive
serial interface frame pulse signal (RC1FP) provides
system timing for the receive serial interface. RC1FP is
supplied in common to all devices in a system containing
one or more NSE-20G devices. In TelecomBus mode,
RC1FP is set high once every four frames, in SBI mode
without any DS0 switching, or when switching DS0s
(WITHOUT CAS) RC1FP is also set high once every four
frames, or multiple thereof. When in SBI mode switching
DS0s WITH CAS RC1FP indicates signaling multiframe
alignment by pulsing once every 48 frames or multiples
thereof.
A software configurable delay from RC1FP is used to
indicate that the C1 multiframe boundary 8B/10B
characters have been delivered on all the receive serial
data links (RP[32:1]/RN[32:1]) and are ready for
processing by the time-space-time switching elements.
RC1FP is sampled on the rising edge of SYSCLK.
Reserved pin, must be left floating
Connection Memory Page. The connection memory
page select signal (CMP) controls the selection of the
connection memory page in the NSE. When CMP is set
high, connection memory page 1 is selected. When CMP
is set low, connection memory page 0 is selected.
Changes to the connection memory page selection are
synchronized to the boundary of the next C1FP frame or
multiframe depending on the mode:
4-Frame SBI/SBI336 mode:
CMP is sampled at the C1 byte position of the incoming
bus on the first frame of the four-frame multiframe.
Changes to the connection memory page selection are
synchronized to the frame boundary (A1 byte position) of
the next four-frame multiframe.
48-Frame SBI/SBI336 mode:
CMP is sampled at the C1 byte position of the incoming
bus on the first frame of the 48-frame multiframe.
Changes to the connection memory page selection are
synchronized to the frame boundary (A1 byte position) of
the next 48-frame multiframe.
TelecomBus mode:
CMP is sampled at the C1 byte position of every frame
on the incoming bus. Changes to the connection memory
pate selection are synchronized to the frame boundary
(A1 byte position) of the next frame.
CMP is sampled on the rising edge of SYSCLK at the
RC1FP frame position.
Reset Enable Bar. The active low reset signal (RSTB)
provides an asynchronous reset for the NSE. RSTB is a
Schmitt triggered input with an integral pull-up resistor
NSE-8G™ Standard Product Data Sheet
Preliminary
26