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XR17D158 Datasheet, PDF (61/72 Pages) Exar Corporation – UNIVERSAL (3.3V AND 5V) PCI BUS OCTAL UART | |||
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REV. 1.2.1
XR17D158
UNIVERSAL (3.3V AND 5V) PCI BUS OCTAL UART
FIGURE 20. PCI BUS CONFIGURATION SPACE REGISTERS READ AND WRITE OPERATION
CLK
Host
1
2
3
4
FRAME#
Host
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
FRAME#
Host
2
3
4
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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