ep2sgx30c Altera Corporation, ep2sgx30c Datasheet - Page 211

• Manufacturer Part Number: ep2sgx30c
• Description: Stratix Ii Gx Device Data Sheet
• Manufacturer: Altera Corporation

Altera Corporation
October 2007
Notes to
(1)
(2)
(3)
(4)
Functional
BASIC
Double
Width
Table 4–22. PCS Latency (Part 3 of 3)
Mode
The latency numbers are with respect to the PLD-transceiver interface clock cycles.
The total latency number is rounded off in the Sum column.
The rate matcher latency shown is the steady state latency. Actual latency may vary depending on the skip ordered set
gap allowed by the protocol, actual PPM difference between the reference clocks, and so forth.
For CPRI 614 Mbps and 1.228 Gbps data rates, the Quartus II software customizes the PLD-transceiver interface clocking
to achieve zero clock cycle uncertainty in the receiver phase compensation FIFO latency. For more details, refer to the CPRI
Mode section in the
Table
Configuration
width; with
width; with
16/20-bit
16/20-bit
32/40-bit
32/40-bit
Matcher
Matcher
Matcher
Matcher
channel
channel
channel
channel
without
without
width;
width;
Rate
Rate
Rate
Rate
4–21:
Stratix II GX Transceiver Architecture Overview
Aligner
2-2.5
2-2.5
Word
4-5
4-5
Deskew
FIFO
-
-
-
-
Note (1)
5.5-6.5
Matcher
11-13
Rate
(3)
-
-
Decoder
8B/10B
0.5
0.5
1
1
Receiver PCS Latency
Receiver
Machine
State
-
-
-
-
chapter in volume 2 of the Stratix II GX Device Handbook
Stratix II GX Device Handbook, Volume 1
serializer
Byte
De-
1
1
1
1
DC and Switching Characteristics
Order
Byte
1-3
1
1
1
Receiver
Phase
Comp
FIFO
1-2
1-2
1-2
1-2
Receiver
PIPE
-
-
-
-
4–41
19-23
11-14
8-10
Sum
6-9
(2)