JEDEC
STANDARD
Serial Interface for Data Converters
JESD204B
(Revision of JESD204A, April 2008)
JULY 2011
JEDEC SOLID STATE TECHNOLOGY ASSOCIATION
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JEDEC Standard No. 204B
Page 1
SERIAL INTERFACE FOR DATA CONVERTERS
(From JEDEC Board Ballot JCB-08-01 and JCB-11-47, formulated under the cognizance of JC-16
Committee on Interface Technology.)
1 Scope
This specification describes a serialized interface between data converters and logic devices. It contains
normative information to enable designers to implement devices that communicate with other devices
covered by this specification. Informative annexes are included to clarify and exemplify the specification.
Due to the range of applications involved, the intention of the document is to completely specify only the
serial data interface and the link protocol. Certain signals common to both the interface and the function
of the device, such as device clocks and control interfaces, have application-dependent requirements.
Devices may also have application-dependent modes, such as a low power / shutdown mode that will
affect the interface. In these instances, the specification merely constrains other device properties as they
relate to the interface, and leaves the specific implementation up to the designer.
Revision A of the standard was expanded to support serial data interfaces consisting of single or multiple
lanes per converter device. In addition, converter functionality (ADC or DAC) can be distributed over
multiple devices:
• All parallel running devices are implemented or specified to run synchronously with each other using
the same data format.
• Normally this means that they are part of the same product family.
Revision B of the standard now supports the following additional functions:
• Mechanism for achieving repeatable, programmable deterministic delay across the JESD204 link.
• Support for serial data rates up to 12.5 Gbps.
• Transition from using frame clock as the main clock source to using device clock as the main clock
source. Device clock frequency requirements offer much more flexibility compared to requiring a
frame clock input.
The logic device (e.g. ASIC or FPGA) is always assumed to be a single device.
Figure
1 compares the scope of the original JESD204 specification and its revisions.
