IPR-PCIE/8 Altera, IPR-PCIE/8 Datasheet - Page 106

• Manufacturer Part Number: IPR-PCIE/8
• Description: IP CORE Renewal Of IP-PCIE/8
• Manufacturer: Altera
• Type: MegaCorer

Specifications of IPR-PCIE/8

• Software Application: IP CORE, Interface And Protocols, PCI
• Supported Families: Arria GX, Cyclone II, HardCopy II, Stratix II
• Core Architecture: FPGA
• Core Sub-architecture: Arria, Cyclone, Stratix
• Rohs Compliant: NA
• Function: PCI Express Compiler, x8 Link Width
• License: Renewal License
• Lead Free Status / RoHS Status: na
• Lead Free Status / RoHS Status: na

Signals
Figure 3–25. Retried Transaction & Masked Non-Posted Transaction Waveform
3–68
PCI Express Compiler User Guide
Descriptor
Signals
Signals
Data
rx_desc[135:128]
rx_desc[127:64]
rx_data[63:32]
rx_desc[63:0]
rx_data[31:0]
rx_be[7:0]
rx_mask
rx_abort
rx_retry
rx_ack
rx_req
rx_ws
Transaction Aborted
In
layer. Having determined it will never be able to accept the transaction
layer packet, the application layer discards it by asserting rx_abort. An
alternative design might implement logic whereby all transaction layer
packets are accepted and, after verification, potentially rejected by the
application layer. An advantage of asserting rx_abort is that
transaction layer packets with data payloads can be discarded in 1 clock
cycle.
Having aborted the first transaction layer packet, the MegaCore function
can transmit the second, a 3 DWORD completion in this case. The
MegaCore function does not treat the aborted transaction layer packet as
an error and updates flow control credits as if the transaction were
acknowledged. In this case, the application layer is responsible for
generating and transmitting a completion with completer abort status
and to signal a completer abort event to the MegaCore function
configuration space through assertion of cpl_err.
rx_dfr
rx_dv
Figure
X
X
X
1
PCI Express Compiler Version 6.1
3–26, a memory read of 16 DWORDS is sent to the application
2
MEMRD 4DW
3
X
00h
Valid
Valid
4
X
X
X
5
MEMWR 1DW
6
Valid
Valid
Clock Cycles
7
DW 0
F0h
X
8
X
X
X
9
10
MEMRD 4DW
11
Valid
Valid
00h
X
12
Altera Corporation
13
X
X
X
December 2006
14