XR17C152 Datasheet, PDF (54/62 Pages) Exar Corporation – 5V PCI BUS DUAL UART

XR17C152
5V PCI BUS DUAL UART
áç
REV. 1.2.0
FIGURE 19. DEVICE CONFIGURATION REGISTERS, UART REGISTERS AND TRANSMIT DATA BURST WRITE OPERA-
TION
CLK
Host
1
2
3
4
5
6
7
8
9
FRAME#
Host
AD[31:0]
Host
Target
Address
D ata
DWORD
D ata
DWORD
D ata
DWORD
D ata
DWORD
Data DW O RD
C/BE[3:0]#
Host
Bus
CMD
Byte Enable# = D W O R D
IRDY#
Host
10
11
TRDY#
Target
DEVSEL#
Target
PAR
Host
Target
Address
P a r ity
D ata
P a r ity
D ata
P a r ity
D ata
P a r ity
D ata
P a r ity
PERR#
Target
Active Active Active Active
SERR#
Target
A c tiv e
Note: PERR# and SER R are optional in a bus target application.
Even Parity is on AD[31:0], C/BE[3:0]#, and PAR
D ata
P a r ity
A c tiv e
PCI_BW R
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