DK-DEV-4SGX230N Altera, DK-DEV-4SGX230N Datasheet - Page 521

• Manufacturer Part Number: DK-DEV-4SGX230N
• Description: KIT DEVELOPMENT STRATIX IV
• Manufacturer: Altera
• Series: Stratix® IVr
• Type: FPGAr

Specifications of DK-DEV-4SGX230N

• Contents: Development Board, Universal Power Supply, Cables and Software
• Silicon Manufacturer: Altera
• Core Architecture: FPGA
• Core Sub-architecture: Stratix
• Silicon Core Number: EP4S
• Silicon Family Name: Stratix IV GX
• Rohs Compliant: Yes
• For Use With/related Products: EP4SGX230K
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 544-2594

Chapter 1: Transceiver Architecture in Stratix IV Devices
Transceiver Block Architecture
Figure 1–59. Deskew FIFO Operation in XAUI Functional Mode
Note to
(1) This figure is from IEEE P802.3ae.
February 2011 Altera Corporation
Figure
1–59:
The deskew operation in XAUI functional mode is compliant to the PCS deskew state
machine diagram specified in clause 48 of IEEE P802.3ae, as shown in
Rate Match (Clock Rate Compensation) FIFO
In asynchronous systems, the upstream transmitter and local receiver can be clocked
with independent reference clocks. Frequency differences in the order of a few
hundred PPM can corrupt the data when latching from the recovered clock domain
(the same clock domain as the upstream transmitter reference clock) to the local
receiver reference clock domain.
The rate match FIFO compensates for small clock frequency differences between the
upstream transmitter and the local receiver clocks by inserting or removing SKP
symbols or ordered sets from the IPG or idle streams. It deletes SKP symbols or
ordered sets when the upstream transmitter reference clock frequency is higher than
the local receiver reference clock frequency. It inserts SKP symbols or ordered-sets
when the local receiver reference clock frequency is higher than the upstream
transmitter reference clock frequency.
deskew_error * SUDI
deskew_error * SUDI
deskew_error * SUDI
deskew_error * SUDI
deskew_error * SUDI
deskew_error * SUDI
deskew_error * SUDI
SUDI(![/||A||/])
enable_deskew
enable_deskew
AUDI
AUDI
AUDI
AUDI
AUDI
AUDI
AUDI
AUDI
LOSS_OF_ALIGNMENT
enable_deskew
1
2
3
ALIGN_ACQUIRED_1
ALIGN_ACQUIRED_2
ALIGN_ACQUIRED_3
ALIGN_ACQUIRED_4
align_status
ALIGN_DETECT_1
ALIGN_DETECT_2
ALIGN_DETECT_3
(Note 1)
SUDI(![/||A||/])
SUDI(![/||A||/])
SUDI(![/||A||/])
SUDI(![/||A||/])
sync_status OK * SUDI(![/||A||/])
⇐
⇐
⇐
⇐
FAIL
FALSE
FALSE
TRUE
1
2
3
SUDI(![/||A||/])
SUDI(![/||A||/])
SUDI(![/||A||/])
reset +
(sync_status=FAIL * SUDI)
Stratix IV Device Handbook Volume 2: Transceivers
!deskew_error
* SUDI(![/||A||/])
!deskew_error
* SUDI(![/||A||/])
!deskew_error
* SUDI(![/||A||/])
!deskew_error
* SUDI(![/||A||/])
!deskew_error
* SUDI(![/||A||/])
!deskew_error
* SUDI(![/||A||/])
!deskew_error
* SUDI(![/||A||/])
Figure
1–59.
1–77