QT2032-EKG-1A2 Applied Micro Circuits Corporation, QT2032-EKG-1A2 Datasheet - Page 21

• Manufacturer Part Number: QT2032-EKG-1A2
• Manufacturer: Applied Micro Circuits Corporation

Specifications of QT2032-EKG-1A2

• Lead Free Status / RoHS Status: Supplier Unconfirmed

5 Datapath Description
This section describes the functional blocks of the QT2022/32. These are illustrated in Figure 2.
Figure 2:
5.1 Transmit Path
5.1.1 XAUI CDR and Demultiplexer
At the transmitter XAUI interface, clock and data are recovered for each of the four 3.125Gb/s input lanes. The dif-
ferential receivers used at this interface have 100 Ω differential input impedance and are intended to be AC coupled
or 1.2 V CML DC coupled. The data on each channel is then demultiplexed/deserialized before being passed to the
next block. A clock is recovered for each lane. Each lane outputs a status bit, xtxlock<3:0> , which is high when the
CDR circuit is in lock. A phase-adjust FIFO aligns the four lanes using the Lane 1 recovered clock.
5.1.2 XAUI Code Synchronization
The XAUI interface demultiplexer has no prior knowledge of code word boundaries and must determine where
each 8B/10B character starts and ends. To achieve this, the code synchronization block searches the data stream
for the unique comma character, /K/, in order to determine the 10 bit code word boundaries for each lane. The
delimited code words are passed to the Frame Deskew block. The code synchronization status is displayed in Reg-
ister bits 4.18h.3:0.
The comma characters, /K/, are found in the XAUI data stream in the IPG between packets.
Revision 5.11
TxXAUI0
TxXAUI1
TxXAUI2
TxXAUI3
3.125 Gb/s
RxXAUI2
RxXAUI3
RxXAUI1
RxXAUI0
CDR
CDR
CDR
CDR
DRV
DRV
DRV
DRV
QT2022/32 Functional Block Diagram
Adjust &
Demux
Phase
XGXS
network
loopback
Code
Code
Code
Code
Sync
Sync
Sync
Sync
AppliedMicro - Confidential & Proprietary
Encoder
Decoder
10b/8b
8b/10b
Align
EEPROM_PROT
EEPROM_SDA
EEPROM_SCL
Adjust
Adjust
Rate
Rate
AMCC
XGXS
system
loopback
Decoder
66b/64b
Encoder
64b/66b
EEPROM / DOM
Interface
Scrambler
scrambler
(QT2032 only)
De-
MDIO Control
PCS
loopback
Interface
Gearbox
Frame
Sync
QT2022/32 - Data Sheet: DS3051
EREFCLK
SREFCLK
(QT2032 only)
VXCOI
(QT2032
(QT2032
only)
WIS
only)
WIS
loopback
TX
RX
MDIO
WIS
MDC
RXPLLOUT
Demux
generator
Mux
clock
sync_err
AMCC
PMA
network
loopback
mon
freq
CDR
Output
Driver
limiting
amp
TXPLLOUT
TXOUT
PMA
system
loopback
LOSOUTB
detector
LOS
RXIN
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