Altera Stratix V Avalon-ST Manual de usuario Pagina 96

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Configuration Space Bypass Mode Interface Signals
In Configuration Space Bypass mode, the soft Configuration Space exchanges control and status informa‐
tion with the Stratix V Hard IP for PCI Express’s Transaction, Data Link and PHY Layers. Refer to
Configuration Space Bypass Modefor information about the division of the Configuration Space function‐
ality in bypass mode.
The following table describes the input signals which are driven from the Application Layer’s soft
Configuration Space to the Transaction Layer’s hard Configuration Space. All signals are synchronous to
pld_clk.
Table 5-12: Configuration Space Bypass Mode Input Signals
Signal Name Direction Description
link2csr[12:0]
Input Bits[12:0] of the link2csr register from the soft Configuration
Space.
comclk_reg
Input Common clock configuration bit of the Link Control Register
in the soft Configuration Space.
extsy_reg
Input Extended synchronization bit of the Link Control Register in
the soft Configuration Space.
max_pload[2:0]
Input MAX_PAYLOAD_SIZE field of the Device Control Register in the
soft Configuration Space.
tx_ecrcgen
Input ECRC Generation Enable which is bit 6 of the Advanced Error
Capabilities and Control Register (0x18) in the soft
Configuration Space.
rx_ecrchk
Input ECRC Check Enable which is Bit 8 of the Advanced Error
Capab ilities and Control Register (0x18) in the soft
Configuration Space.
secbus[7]
Input MSB of the Secondary Bus Number Register in the soft
Configuration Space.
secbus[6:0]
Input Low-order 7 bits of Secondary Bus Number Register in the soft
Configuration Space.
linkcsr_bit0
Input Active State Power Management (ASPM) Control which is Bit
0 of the Link Control Register in the soft Configuration Space.
ASPM is not supported.
5-44
Configuration Space Bypass Mode Interface Signals
UG-01097_avst
2014.12.15
Altera Corporation
Interfaces and Signal Descriptions
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