DS634 Datasheet, PDF (6/20 Pages) –

IEEE 802.16e CTC Decoder v4.0
CORE Generator Parameters
Figure 5 shows the CORE Generator Graphical User Interface (GUI) of the IEEE 802.16e CTC decoder
core. Table 2 has a detailed description of the GUI parameters.
X-Ref Target - Figure 5
Discontin_{Figure 5: CTC Decoder Core GUI}
u _{Table 2: CORE Generator Parameters Description}
GUI Parameter
Description
ed _{Block Size}
Maximum block size supported by the core. Allowed values are 600 or 60 bytes. The
60 byte option is used to support the IEEE 802.16e (WiMax) specification and the
HARQ mode, while the 600 byte option is used to support the optional IR HARQ
mode.
SISO Decoders
Number of Soft Input Soft Output (SISO) Decoders. Allowed values are 1, 2, 3, 4, 5,
6, or 8.
IP ^{Soft Input Data Bits}
Number of soft input data bits. Allowed values are 4, 6, or 8. Other values like 5 or 7
are supported by generating the core with 6 or 8 soft input bits, and the user has to
sign extend the incoming data to the core to 6 or 8 bits.
Extrinsic Data Bits
Number of extrinsic data bits. When soft input data bits is 4, allowed value is 6. When
soft input data bits is 6, allowed values are 6 or 8. When soft input data bits is 8,
allowed values are 8 or 10.
Timing Interface
All core inputs and outputs are synchronous to the clk input. For best results, the inputs to the core
should be driven from registers that are clocked with the rising edge of clk. Likewise, the outputs of the
core should drive registers that are clocked with the rising edge of clk.
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DS634 December 2, 2009
Product Specification