Altera CPRI IP Core - Manual (Page 29)

Chapter 3: Parameter Settings 3–5
Application Layer Parameters
December 2013 Altera Corporation CPRI MegaCore Function
User Guide
Include HDLC Block
Turn on the Include HDLC block parameter to specify that your CPRI IP core
includes an internal HDLC block. By default, this parameter is turned off.
If this parameter is turned off in your CPRI IP core, your application cannot access the
HDLC registers. Attempts to access these registers read zeroes and do not write
successfully, as for a reserved register address.
For information about the HDLC block, refer to “Accessing the HDLC Channel” on
page 4–50 .
Application Layer Parameters
This section lists the parameters that affect the configuration of the application layer
of the CPRI IP core.
Mapping Mode
The Mapping mode(s) parameter specifies whether your CPRI IP core MAP interface
supports a programmable AxC mapping mode or is configured with a specific
mapping mode.
Table 3–2 lists the supported values.
Table 3–2. MAP Interface AxC Mapping Mode Support (Part 1 of 2)
Value Description
All
If you select this value, you configure a CPRI IP core which you can program
dynamically to be in any mapping mode. In this case, you determine the current
mapping mode for your CPRI IP core by programming the
map_mode field of the
CPRI_MAP_CONFIG register (0x100).
For backward compatibility with previous releases of the CPRI IP core, the value of
All is the default value for this parameter.
For information about the map_mode register field, refer to Table 7–31 on
page 7–15 .
Basic
Your CPRI IP core MAP interface is configured to function in basic mapping mode
only. This mapping mode has the following features:
■ Conforms to the description in Sections 4.2.7.2.2 and 4.2.7.2.3 of the CPRI
Specification V4.2 Interface Specification.
■ Supports communication that complies with the LTE/E-UTRA or UMTS/WCDMA
standard.
For information about the basic mapping mode in the CPRI IP core, refer to “MAP
Interface Mapping Modes” on page 4–13 .
Advanced 1
Your CPRI IP core MAP interface is configured in a single AxC mapping mode only,
a mode that has the following features:
■ Conforms to Method 1: IQ Sample Based described in Section 4.2.7.2.5 of the
CPRI Specification V4.2 Interface Specification.
■ Supports communication that complies with the WiMAX standard.
For information about this AxC mapping mode, refer to Appendix D, Advanced AxC
Mapping Modes .