XR17L152 Datasheet, PDF (51/55 Pages) Exar Corporation – 3.3V PCI BUS DUAL UART

XR17L152
3.3V PCI BUS DUAL UART
REV. 1.1.0
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DISCONTINUED
FIGURE 19. 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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