Altera Arria V Hard IP for PCI Express - Manual (Page 132)

7–34 Chapter 7: IP Core Interfaces
Arria V Hard IP for PCI Express
Arria V Hard IP for PCI Express December 2013 Altera Corporation
User Guide
Configuration Space Register Access
The tl_cfg_ctl signal is a multiplexed bus that contains the contents of
Configuration Space registers as shown in Table 7–11 . Information stored in the
Configuration Space is accessed in round robin order where tl_cfg_add indicates
which register is being accessed. Table 7–13 shows the layout of configuration
information that is multiplexed on tl_cfg_ctl .
Table 7–14 describes the Configuration Space registers referred to in Table 7–11 and
Table 7–13 .
Table 7–13. Multiplexed Configuration Register Information Available on tl_cfg_ctl (1)
Index 31:24 23:16 15:8 7:0
0
cfg_dev_ctrl_func[15:0]
cfg_dev_ctrl2[15:0]
cfg_dev_ctrl[14:12]=
Max Read Req Size (2)
cfg_dev_ctrl[7:5]=
Max Payload (2)
1 16’h0000 cfg_slot_ctrl[15:0]
2 cfg_link_ctrl[15:0] cfg_link_ctrl2[15:0]
3 8’h00 cfg_prm_cmd_func[15:0] cfg_root_ctrl[7:0]
4 cfg_sec_ctrl[15:0] cfg_secbus[7:0] cfg_subbus[7:0]
5 cfg_msi_addr[11:0] cfg_io_bas[19:0]
6 cfg_msi_addr[43:32] cfg_io_lim[19:0]
7 8h’00 cfg_np_bas[11:0] cfg_np_lim[11:0]
8 cfg_pr_bas[31:0]
9 cfg_msi_addr[31:12] cfg_pr_bas[43:32]
A cfg_pr_lim[31:0]
B cfg_msi_addr[63:44] cfg_pr_lim[43:32]
C cfg_pmcsr[31:0]
D cfg_msixcsr[15:0] cfg_msicsr[15:0]
E
6’h00,
tx_ecrcgen[25], (3)
rx_ecrccheck[24]
cfg_tcvcmap[23:0]
F cfg_msi_data[15:0] 3’b000 cfg_busdev[12:0]
Notes to Table 7–13 :
(1) Items in blue are only available for Root Ports.
(2) This field is encoded as specified in Section 7.8.4 of the PCI Express Base Specification . (3’b000–3’b101 correspond to 128–4096 bytes).
(3) rx_ecrccheck and tx_ecrcgen are bit s 24 and 25 of tl_cfg_ctl , respectively. (Other bit specifications in this table indicate the bit location
within the Configuration Space register.)
Table 7–14. Configuration Space Register Descriptions (Part 1 of 4)
Register Width Dir Description
Register
Reference
cfg_dev_ctrl_func 16 O
cfg_dev_ctrl_func[15:0] is Device Control
register for the PCI Express capability structure.
Table 8–7 on
page 8–4
cfg_dev_ctrl2 16 O
cft_dev_ctrl2[31:16] is Device Control register 2 for
the PCI Express capability structure.
Table 8–8 on
page 8–4