XR17C154_05 Datasheet, PDF (56/62 Pages) Exar Corporation – 5V PCI BUS QUAD UART

XR17C154
5V PCI BUS QUAD UART
xr
REV. 1.3.2
FIGURE 20. DEVICE CONFIGURATION REGISTERS, UART REGISTERS AND RECEIVE DATA BURST READ OPERATION
CLK
Host
1
FRAME#
Host
AD[31:0]
AD
Host Target
8
Data
13
Data
18
Data
23
Data
C/BE[3:0]# ^Bus
Host
CMD
IRDY#
Host
Byte Enable# = DWORD
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
PCI_BRD
56