XR17C154_05 Datasheet, PDF (53/62 Pages) Exar Corporation – 5V PCI BUS QUAD UART

xr
REV. 1.3.2
XR17C154
5V PCI BUS QUAD UART
NOTE:
FIGURE 17. PCI BUS CONFIGURATION SPACE REGISTERS READ AND WRITE OPERATION
CLK
Host
1
FRAME#
Host
2
3
4
AD[31:0]
Host
Target
ADDRESS
DATA
C/BE[3:0]#
Host
CFG-RD
BYTE ENABLE#
IRDY#
Host
TRDY#
Target
DEVSEL#
Target
PCICFG_RD
CLK
Host
1
2
3
4
FRAME#
Host
AD[31:0]
Host
Target
ADDRESS
WRITE DATA
C/BE[3:0]#
Host
CFG-WR
BYTE ENABLE#
IRDY#
Host
TRDY#
Target
DEVSEL#
Target
PCICFG_WR
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