XR17D158_05 Datasheet, PDF (65/73 Pages) Exar Corporation – UNIVERSAL (3.3V AND 5V) PCI BUS OCTAL UART

xr
REV. 1.2.2
XR17D158
UNIVERSAL (3.3V AND 5V) PCI BUS OCTAL UART
FIGURE 23. 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
65