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52 www.xilinx.com Ethernet AVB Endpoint User Guide
UG492 July 23, 2010
Chapter 5: Core Architecture
Processor Local Bus (PLB) Interface
The Processor Local Bus (PLB) on the Ethernet Audio Video core is designed to be
integrated directly in the Xilinx Embedded Development Kit (EDK) where it can be easily
integrated and connected to the supported embedded processors (MicroBlaze or
PowerPC). As a result, the PLB interface does not require in-depth understanding, and the
following information is provided for reference only. See the EDK documentation
for
further information.
The PLB interface, defined by IBM, can be complex and support many usage modes (such
as multiple bus masters). It can support single or burst read/writes, and can support
different bus widths and different peripheral bus widths.
The general philosophy of the Ethernet AVB Endpoint core has been to implement a PLB
interface which is as simple as possible. The following features are provided:
• 32-bit data width.
• Implements a simple PLB slave.
• Supports single read/writes only (no burst or page modes).
host_miim_rdy Input When high, the MAC has completed its
MDIO transaction
host_stats_lsw_rdy Input Signal provided by the Ethernet Statistics
core to indicate that the lower 32-bits of
the statistic counter value is present on
the host_rd_data_stats[31:0] port. If the
statistics core is not used, then connect to
logic 0.
host_stats_msw_rdy Input Signal provided by the Ethernet Statistics
core to indicate that the upper 32-bits of
the statistic counter value is present on
the host_rd_data_stats[31:0] port. If the
statistics core is not used, then connect to
logic 0.
Table 5-8: Tri-Mode Ethernet MAC Host Interface (Configuration/Status)
Signal Direction Description