Xilinx IP Ethernet AVB Endpoint v2.4 UG492 - Manual (Page 93)

Ethernet AVB Endpoint User Guide www.xilinx.com 93
UG492 September 21, 2010
PLB Address Map and Register Definitions
Rx PTP Packet Control Register
Table 10-2 defines the associated control register of the “Rx PTP Packet Buffer,” used by
the “Software Drivers” to monitor the position of the most recently received PTP frame.:
Rx Filtering Control Register
Table 10-3 defines the associated control register of the “Rx Splitter.” The Rx path is
capable of identifying the AV packets using configurable VLAN priority:
Table 10-2: Rx PTP Packet Buffer Control Register (PLB_base_address + 0x2004)
Bit no Default Access Description
0 0 WO rx_clear . When written with a ‘1,’ forces the buffer to
empty, in practice moving the write address to the same
value as the read address.
If read, always return 0.
7-1 0 RO Unused
11-8 0 RO rx_packet . Indicates the number (block RAM bin
position) of the most recently received PTP packet.
31-12 0 RO Unused
Note: A read or a write to this register clears the interrupt_ptp_rx interrupt (asserted after each
successful PTP packet reception).
Table 10-3: Rx Filtering Control Register (PLB_base_address + 0x2008)
Bit no Default Access Description
2-0 3 R/W VLAN Priority A . If a tagged packet is received with a
VLAN priority field matching either of the Priority A or
B values, then the packet will be considered as an AV
frame: it will be passed to the AV I/F. Otherwise it will
be passed to the Legacy I/F.
7-3 0 RO Unused
10-8 2 R/W VLAN Priority B . If a tagged packet is received with a
VLAN priority field matching either of the Priority A or
B values, then the packet will be considered as an AV
frame: it will be passed to the AV I/F. Otherwise it will
be passed to the Legacy I/F.
15-11 0 RO Unused
16 1 R/W Promiscuous Mode for the “Legacy MAC Header
Filters.”
If this bit is set to 1, the MAC Header Filter is set to
operate in promiscuous mode. All frames will be passed
to the
“Rx Legacy Traffic I/F.”
If set to 0 then only matching MAC headers are passed
to the
“Rx Legacy Traffic I/F.”