Altera Arria V Hard IP for PCI Express - Manual (Page 162)

8–8 Chapter 8: Register Descriptions
Altera-Defined Vendor Specific Extended Capability (VSEC)
Arria V Hard IP for PCI Express December 2013 Altera Corporation
User Guide
Table 8–17 defines the CvP Data register. Programming software should write the
configuration data to this register. Every write to this register sets the data output to
the FPGA control block and generates <n> clock cycles to the FPGA control block as
specified by the
CVP_NUM_CLKS field in the CvP Mode Control register. Software must
ensure that all bytes in the memory write dword are enabled. You can access this
register using configuration writes, alternatively, when in CvP mode, this register can
also be written by a memory write to any address defined by a memory space BAR for
this device. Using memory writes should allow for higher throughput than
configuration writes.
Table 8–18 defines the CvP Programming Control register. This register is written by
the programming software to control CvP programming.
f Refer to Configuration via Protocol (CvP) Implementation in Altera FPGAs User Guide for
more information about using CvP.
[1]
HIP_CLK_SEL . Selects between PMA and fabric clock when USER_MODE = 1 and
PLD_CORE_READY = 1. The following encodings are defined:
■ 1: Selects internal clock from PMA which is required for CVP_MODE
■ 0: Selects the clock from soft logic fabric. This setting should only be used
when the fabric is configured in
USER_MODE with a configuration file that
connects the correct clock.
To ensure that there is no clock switching during CvP, you should only change
this value when the Hard IP for PCI Express has been idle for 10
μ
s and wait
10
μ
s after changing this value before resuming activity.
1’b0 RW
[0]
CVP_MODE . Controls whether the HIP is in CVP_MODE or normal mode. The
following encodings are defined:
■ 1: CVP_MODE is active. Signals to the FPGA control block active and all TLPs
are routed to the Configuration Space. This
CVP_MODE cannot be enabled if
CVP_EN = 0.
■ 0: The IP core is in normal mode and TLPs are route to the FPGA fabric.
1’b0 RW
Table 8–16. CvP Mode Control (Part 2 of 2)
Bits Register Description Reset Value Access
Table 8–17. CvP Data Register
Bits Register Description Reset Value Access
[31:0]
Configuration data to be transferred to the FPGA control block to configure the
device.
0x00000000 RW
Table 8–18. CvP Programming Control Register
Bits Register Description Reset Value Access
[31:2] Reserved. 0x0000 RO
[1]
START_XFER . Sets the CvP output to the FPGA control block indicating the start
of a transfer.
1’b0 RW
[0]
CVP_CONFIG . When asserted, instructs that the FPGA control block begin a
transfer via CvP.
1’b0 RW