Altera IP Compiler for PCI Express - Manual (Page 323)

Chapter : B–5
Descriptor/Data Interface
August 2014 Altera Corporation IP Compiler for PCI Express User Guide
The IP core generates the eight MSBs of this signal with BAR decoding information.
Refer to
Table B–3 .
Table B–4 describes the data phase signals.
rx_mask I
Receive mask (non-posted requests). This signal is used to mask all non-posted
request transactions made to the application interface to present only posted and
completion transactions. This signal must be asserted with rx_retry and
deasserted when the IP core can once again accept non-posted requests.
Note to Table B–2 :
(1) For all signals, is the virtual channel number which can be 0 or 1.
Table B–2. RX Descriptor Phase Signals (Part 2 of 2)
Signal I/O Description
Table B–3. rx_desc[135:128]: Descriptor and BAR Decoding (Note 1)
Bit Type 0 Component
128 = 1: BAR 0 decoded
129 = 1: BAR 1 decoded
130 = 1: BAR 2 decoded
131 = 1: BAR 3 decoded
132 = 1: BAR 4 decoded
133 = 1: BAR 5 decoded
134 = 1: Expansion ROM decoded
135 Reserved
Note to Table B–3 :
(1) Only one bit of [135:128] is asserted at a time.
Table B–4. RX Data Phase Signals (Part 1 of 2)
Signal I/O Description
rx_dfr (1) O
Receive data phase framing. This signal is asserted on the same or subsequent clock
cycle as rx_req to request a data phase (assuming a data phase is needed). It is
deasserted on the clock cycle preceding the last data phase to signal to the application
layer the end of the data phase. The application layer does not need to implement a
data phase counter.
rx_dv (1) O
Receive data valid. This signal is asserted by the IP core to signify that
rx_data[63:0]
contains data.