HSDC-JAKIT1W2/DB NXP Semiconductors, HSDC-JAKIT1W2/DB Datasheet - Page 14

• Manufacturer Part Number: HSDC-JAKIT1W2/DB
• Description: DAC/ADC LATTICE KIT
• Manufacturer: NXP Semiconductors
• Series: -r

Specifications of HSDC-JAKIT1W2/DB

• Main Purpose: Interface, ADC/DAC for Lattice ECP3 FPGA
• Embedded: Yes, FPGA / CPLD
• Utilized Ic / Part: ADC1413D, DAC1408D, ECP3 FPGA
• Primary Attributes: Loop Back Demo with 2 High Speed Converters
• Secondary Attributes: USB Powered
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 568-6898

NXP Semiconductors
DAC1408D650
Product data sheet
10.2.3 Comma detection and word align
The lane processing makes use of the sync patterns to synchronize the data stream,
determine the initial running disparity and extract the 10-bit word from the incoming data
stream (word-alignment).
The SYNC_OUT signal is also used during normal operation by the DAC1408D650 to
request a link reinitialization. This occurs when the 10b/8b module loses synchronization.
The SYNC_OUT signal conforms to LVDS signaling. Its common-mode voltage and its
differential peak-to-peak amplitude can be programmed using SET_SYNC_LEVEL bits in
the SET_SYNC registers (see
SYNC_OUT is asynchronous with the frame clock. There is no timing specification with
respect to the CLKINP and CLKINN inputs.
This stage monitors the data stream for code characters (comma detection), decodes the
words to bytes (octets) and performs optional character replacement as part of frame/lane
alignment monitoring and correction. This module provides the required control signals to
the RX controller and ILA.
This module decodes the 10-bit words into 8-bit words (octets). The decoding table is
specified in the IEEE 802.3-2005 specification. During decoding, the disparity is
calculated according to the disparity rules mentioned in the same specification
IEEE 802.3-2005. When the disparity counter is more than +2 or less than 2, an error is
generated.
The following comma symbols are detected during data transmission irrespective of the
running disparity:
The following flags are also triggered according to the following definitions:
DAC1408D650 supports character replacement whatever the state of the descrambler.
When scrambling is not active, the received K28.3 /A/ or K28.7 /F/ is replaced by the
previous sample. When scrambling is active, the corresponding data octet D28.3 (0xC) or
D28.7 (0xFC) is used.
A flag is sent to the control interface to reflect detected commas in registers.
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•
•
•
VALID: a code group that is found in the column of the 10b/8b decoding tables
according to the current running disparity.
DISPARITY ERROR: The received code group exists in the 10b/8b decoding table,
but is not found in the proper column according to the current running disparity.
NOT-IN-TABLE (NIT) ERROR: The received code group is not found in the 10b/8b
decoding table for either disparity.
INVALID: a code group that either shows a disparity error or that does not exist in the
10b/8b decoding table.
/K/ = K28.5
/F/ = K28.7
/A/ = K28.3
/R/ = K28.0
/Q/ = K28.4
All information provided in this document is subject to legal disclaimers.
Rev. 4 — 26 November 2010
Table 77 on page
2, 4 or 8 interpolating DAC with JESD204A
55).
DAC1408D650
© NXP B.V. 2010. All rights reserved.
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