ep2sgx30c Altera Corporation, ep2sgx30c Datasheet - Page 31
ep2sgx30c
Manufacturer Part Number
ep2sgx30c
Description
Stratix Ii Gx Device Data Sheet
Manufacturer
Altera Corporation
Datasheet
1.EP2SGX30C.pdf
(314 pages)
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Altera Corporation
October 2007
Programmable Run Length Violation
The word aligner supports a programmable run length violation counter.
Whenever the number of the continuous ‘0’ (or ‘1’) exceeds a user
programmable value, the rx_rlv signal goes high for a minimum pulse
width of two recovered clock cycles. The maximum run values supported
are shown in
Running Disparity Check
The running disparity error rx_disperr and running disparity value
rx_runningdisp are sent along with aligned data from the 8B/10B
decoder to the FPGA. You can ignore or act on the reported running
disparity value and running disparity error signals.
Bit-Slip Mode
The word aligner can operate in either pattern detection mode or in
bit-slip mode.
The bit-slip mode provides the option to manually shift the word
boundary through the FPGA. This feature is useful for:
■
■
■
This feature can be applied at 10-bit and 16-bit data widths.
The word aligner outputs a word boundary as it is received from the
analog receiver after reset. You can examine the word and search its
boundary in the FPGA. To do so, assert the rx_bitslip signal. The
rx_bitslip signal should be toggled and held constant for at least two
FPGA clock cycles.
For every rising edge of the rx_bitslip signal, the current word
boundary is slipped by one bit. Every time a bit is slipped, the bit received
earliest is lost. If bit slipping shifts a complete round of bus width, the
word boundary is back to the original boundary.
Single-Width
Double-Width
Table 2–7. Maximum Run Length (UI)
Longer synchronization patterns than the pattern detector can
accommodate
Scrambled data stream
Input stream consisting of over-sampled data
Mode
Table
8 Bit
2–7.
128
—
10 Bit
Stratix II GX Device Handbook, Volume 1
160
—
PMA Serialization
16 Bit
512
Stratix II GX Architecture
—
20 Bit
640
—
2–23
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