Altera Stratix GX Transceiver - Manual (Page 78)

3–32 Altera Corporation
Stratix GX Transceiver User Guide January 2005
Basic Mode MegaWizard Plug-In
Figure 3–27. MegaWizard Plug-In Manager - ALTGXB (Page 5 of 9) - Receiver (1) Notes (1) , (2)
Notes to Figure 3–27 :
(1) You can enable or disable 8B/10B. With 8B/10B active, data width must be 8-bits or 16-bits.
(2) For more information, refer to the Stratix GX Analog Description chapter.
(3) rx_enacdet : supports word aligner to byte align to the word alignment pattern. When rx_enacdet is held high,
the word aligner aligns to the byte boundary, if the comma is detected. If this option is de-selected, the word aligner
is not active, but the pattern detect signal is still functional. Refer to the word aligner section for further details.
(4) Manual bit-slipping mode lets you control the word aligner’s shift register directly via the rx_bitslip port. A low
to high transition on the rx_bitslip port enables the word aligner’s shift register to slip one bit. For example, if
a 3-bit shift is required to align the incoming byte, then rx_bitslip must be toggled low, high, low, high, low, high.
The rx_bitslip port can be left in the high or low position after the above sequence.
(5) The word alignment pattern size must be set to 16-bits if using 8-bits or 16-bits data bus size with 8B/10B off. With
8B/10B on and a data width of 8-bits or 16-bits, the pattern size must be 7-bits or 10-bits. The 7-bit mode is for the
pattern detect module. Word alignment is still done on the 10-bit pattern, even in a 7-bit mode.
(6) Flips the word alignment bit order. If checked, the right-most bit is the MSB, otherwise the right-most bit is the LSB.
This option is used in conjunction with the receiver and transmitter bit-flip options to ensure that the MSB is
transmitted/received first in the serial stream. Not available if 8B/10B is used.