Modifiable Attributes; Byte Mapping; Table 1-6: Control/Status Bus Association To Data Bus Byte Paths - Xilinx RocketIO X User Manual

Modifiable Attributes

Modifiable Attributes
As shown in
certain attributes are modifiable for any primitive. These attributes help to define the
protocol used by the primitive. Only the GT10_CUSTOM primitive allows the user to
modify all of the attributes to a protocol not supported by another transceiver primitive.
This allows for complete flexibility. The other primitives allow modification of the analog
attributes of the serial data lines and several channel-bonding values.

Byte Mapping

Most of the 8-bit wide status and control buses correlate to a specific byte of the TXDATA
or RXDATA. This scheme is shown in
together regardless of the data path width needed for the GT10_CUSTOM. All other
primitives with specific data width paths and all byte-mapped ports are affected by this
situation. For example, a 1-byte wide data path has only 1-bit control and status bits
(TXCHARISK[0]) correlating to the data bits TXDATA[7:0].

Table 1-6: Control/Status Bus Association to Data Bus Byte Paths

RocketIO™ X Transceiver User Guide
UG035 (v1.5) November 22, 2004
Appendix F, "Modifiable Attributes" (Table F-1
Control/Status Bit
[0]
[1]
[2]
[3]
[4]
[5]
[6]
[7]
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through
Table 1-6. This creates a way to tie all the signals
Table F-9) only
Data Bits
[7:0]
[15:8]
[23:16]
[31:24]
[39:32]
[47:40]
[55:48]
[64:56]
39
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