Serial Rate Support; Encoding Support And Clock Multipliers; Flexibility - Xilinx Virtex-4 RocketIO User Manual

R

Serial Rate Support

As the MGTs continue to migrate, so do the supported serial rates. Virtex-4 MGTs span the
serial range of both Virtex-II Pro and Virtex-II Pro X MGTs.
supported by each MGT.
Table E-3: Serial Rate Support

Encoding Support and Clock Multipliers

Table E-4
available.
Table E-4: Encoding Support and Clock Multipliers
Encoding Schemes
Clock Multipliers
Notes:
1. Byte alignment must be done in fabric.
2. Encoding and clocks must be done in fabric.
3. Depending on encode, some functionality must be done in fabric.
4. SONET is supported only for the OC-12 protocol.

Flexibility

In Virtex-II Pro devices, changing of attributes required partial reconfiguration.
Virtex-II Pro X devices allow dynamic changing of PMA attributes via the PMA attribute
bus. Virtex-4 devices allow all attribute changes from the Dynamic Reconfiguration Port,
plus any default values can be set in the HDL itself.
Virtex-4 RocketIO MGT User Guide
UG076 (v4.1) November 2, 2008
Virtex-II Pro Virtex-II Pro X
0.622 – 3.125 2.488 – 6.25
shows the encoding available in the MGT and which clock multipliers are
Virtex-II Pro
8B/10B Yes
64B/66B Yes
SONET Yes
Others Yes
X16 –
X20 Yes
X32 –
X40 –
www.xilinx.com
Virtex-4
0.622 – 6.5
Virtex-II Pro X
Yes
(2)
Yes
(2) (1)
Yes
(3) (3)
Yes
Yes
Yes
Yes
Yes
Primary Differences
Table E-3 shows the rates
Virtex-4
Yes
No
(4)
Yes
(3)
Yes
Yes
Yes
Yes
Yes
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