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72 www.xilinx.com PowerPC™ 405 Processor Block Reference Guide
1-800-255-7778 UG018 (v2.0) August 20, 2004
Chapter 2: Input/Output Interfaces
R
Figure 2-15: Data-Side PLB Interface Block Symbol
UG018_05_102001
PPC405
PLBC405DCUADDRACK
PLBC405DCUSSIZE1
PLBC405DCURDDACK
PLBC405DCURDDBUS[0:63]
PLBC405DCURDWDADDR[1:3]
PLBC405DCUWRDACK
PLBC405DCUBUSY
PLBC405DCUERR
C405PLBDCUREQUEST
C405PLBDCURNW
C405PLBDCUABUS[0:31]
C405PLBDCUSIZE2
C405PLBDCUCACHEABLE
C405PLBDCUWRITETHRU
C405PLBDCUU0ATTR
C405PLBDCUGUARDED
C405PLBDCUBE[0:7]
C405PLBDCUPRIORITY[0:1]
C405PLBDCUABORT
C405PLBDCUWRDBUS[0:63]
Table 2-12: Data-Side PLB Interface I/O Signal Summary
Signal
I/O
Type
If Unused Function
C405PLBDCUREQUEST O No Connect Indicates the DCU is making a data-access request.
C405PLBDCURNW O No Connect Specifies whether the data-access request is a read or
a write.
C405PLBDCUABUS[0:31] O No Connect Specifies the memory address of the data-access
request.
C405PLBDCUSIZE2 O No Connect Specifies a single word or eight-word transfer size.
C405PLBDCUCACHEABLE O No Connect Indicates the value of the cacheability storage
attribute for the target address.
C405PLBDCUWRITETHRU O No Connect Indicates the value of the write-through storage
attribute for the target address.
C405PLBDCUU0ATTR O No Connect Indicates the value of the user-defined storage
attribute for the target address.
C405PLBDCUGUARDED O No Connect Indicates the value of the guarded storage attribute
for the target address.
C405PLBDCUBE[0:7] O No Connect Specifies which bytes are transferred during single-
word transfers.
C405PLBDCUPRIORITY[0:1] O No Connect Indicates the priority of the data-access request.
C405PLBDCUABORT O No Connect Indicates the DCU is aborting an unacknowledged
data-access request.
C405PLBDCUWRDBUS[0:63] O No Connect The DCU write-data bus used to transfer data from
the DCU to the PLB slave.
PLBC405DCUADDRACK I 0 Indicates a PLB slave acknowledges the current data-
access request.
PLBC405DCUSSIZE1 I 0 Specifies the bus width (size) of the PLB slave that
accepted the request.