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152 www.xilinx.com PowerPC™ 405 Processor Block Reference Guide
1-800-255-7778 UG018 (v2.0) August 20, 2004
Chapter 3: PowerPC 405 OCM Controller
R
Figure 3-6 shows the extended feature in Virtex-4 for DSOCM-to-Memory-Mapped-Slave-
Peripheral interface.
ISOCM Ports
Figure 3-7 and Figure 3-8 are block diagrams of the ISOCM in Virtex-II Pro and Virtex-4.
All signals are in big endian format.
Figure 3-6: DSOCM to Memory-Mapped Slave Peripheral (Virtex-4 Extended Feature)
DSOCMBRAMEN
UG018_37c_042304
DSOCMBRAMABUS[8:29]
Virtex-4 Processor Block
DSOCMBRAMWRDBUS[0:31]
DSOCMBRAMBYTEWRITE[0:3]
BRAMDSOCMRDDBUS[0:31]
DSOCMRDADDRVALID
DSOCMWRADDRVALID
DSOCMRDWRCOMPLETE
BRAMDSOCMCLK
Data-Side
On-Chip Memory
(DSOCM) Controller
Memory Mapped
OCM Slave
(Variable Latency)
Figure 3-7: ISOCM Interface for Virtex-II Pro
ISOCMBRAMEN
ISOCMBRAMODDWRITEEN
UG018_38_020102
RESET
ISOCMBRAMRDABUS[8:28]
BRAMISOCMRDDBUS[0:63]
ISOCMBRAMWRABUS[8:28]
ISOCMBRAMWRDBUS[0:31]
BRAMISOCMCLK
CPMC405CLOCK
ISCNTLVALUE[0:7]
ISARCVALUE[0:7]
TIEISOCMDCRADDR[0:7]
ISOCMBRAMEVENWRITEEN
Clock & Reset are
same signals that go
into CPU; therefore,
no separate Clock &
Reset are required.
Instruction-Side
On-Chip Memory
(ISOCM) Controller