XR17D158IV-F Datasheet, PDF (63/73 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 21. DEVICE CONFIGURATION AND UART REGISTERS READ OPERATION FOR A BYTE OR DWORD
CLK
Host
1
2
3
4
5
6
7
8
9
FRAME#
Host
AD[31:0]
Host Target
Address
Data
BYTE
Data
WORD
C/BE[3:0]#
Host
Bus
CMD
Byte Enable# = BYTE
Byte Enable# = DWORD
IRDY#
Host
10
11
TRDY#
Target
DEVSEL#
Target
PAR
Host Target
Address
Parity
Data
Parity
PERR#
Target
SERR#
Targe
t
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
Active
Data
Parity
Active
PCI_RD1
63