PM8621 PMC-Sierra, Inc., PM8621 Datasheet - Page 18

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

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Proprietary and Confidential to PMC-Sierra, Inc., and for its Customers’ Internal Use
Document ID: PMC-2010850, Issue 1
Block Diagram
The NSE-8G is organized as a DS0 granularity space switch. Alternatively, the NSE-8G is
organized as a self aligning (with respect to STS-12 boundaries in TelecomBus mode)
VT1.5/VT2 granularity space switch.
Figure 5 NSE- 8G Block Diagram Showing Functional Blocks
The R8TD, in combination with the RXLV and DRU receive, decode and align incoming
SBI336/STS-12-equivalent LVDS links. Outputs are provided to the primary switching flow and
to the in-band signaling channel. These provide all analog and digital functions to terminate a
full-duplex 777.6 MHz serial SBI336S or 777.6 MHz serial TelecomBus on LVDS.
A 12 X 12 DS0 Crossbar Switch(DCB) stage switches data and control signals between the 12
ports. The switching instructions are stored in two pages of ram configured as offline and online
allowing the user to modify the offline page.
RP[0]
RP[1]
RP[11]
RN[0]
RN[1]
RN[11]
SYSCLK
RC1FP
CMP
Receiver
Receiver
Receiver
(RXLV)
(RXLV)
(RXLV)
LVDS
LVDS
LVDS
Recovery
Recovery
Recovery
(DRU)
(DRU)
(DRU)
Data
Data
Data
Unit
Unit
Unit
Decoder
Decoder
Decoder
Receive
Receive
Receive
(R8TD)
(R8TD)
(R8TD)
8B/10B
8B/10B
8B/10B
Controller
Controller
Controller
In-Band
In-Band
In-Band
(ILC)
(ILC)
(ILC)
Link
Link
Link
1/2
1/2
1/2
DS0 Crossbar Switch
(DCB)
Microprocessor Interface
NSE-8G™ Standard Product Data Sheet
Controller
Controller
Controller
In-Band
In-Band
In-Band
(ILC)
(ILC)
(ILC)
Link
Link
Link
1/2
1/2
1/2
Transmit
Transmit
Transmit
Encoder
Encoder
Encoder
8B/10B
8B/10B
8B/10B
(T8TE)
(T8TE)
(T8TE)
JTAG
Synthesis
Serializer
Serializer
Serializer
Transmit
Transmit
Transmit
(PISO)
(PISO)
(PISO)
Clock
Unit
Preliminary
Transmitt
Transmitt
Transmitt
(TXLV)
(TXLV)
(TXLV)
LVDS
LVDS
LVDS
Ref
Tx
er
er
er
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TP[0]
TN[0]
TP[1]
TN[1]
TP[11]
TN[11]