XR17D154 Datasheet, PDF (61/69 Pages) Exar Corporation – UNIVERSAL (3.3V AND 5V) PCI BUS QUAD UART

xr
REV. 1.2.0
XR17D154
UNIVERSAL (3.3V AND 5V) PCI BUS QUAD UART
FIGURE 23. DEVICE CONFIGURATION REGISTERS, UART REGISTERS AND RECEIVE DATA BURST READ OPERATION
CLK
Host
1
FRAME#
Host
8
13
18
23
AD[31:0]
AD
Host Target
Data
Data
Data
Data
C/BE[3:0]# ^Bus
CMD
Host
Byte Enable# = DW ORD
IRDY#
Host
TRDY#
Target
DEVSEL#
Target
PAR
AD
Data
Host
Target
PERR#
Target
Active
SERR#
Target
Active
Note: PERR# and SERR are optional in a bus target application.
Even Parity is on AD[31:0], C/BE[3:0]#, and PAR
Data
Active
Data
Active
Data
Active
P C I_ B R D
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