r5s77631ay266bgv Renesas Electronics Corporation., r5s77631ay266bgv Datasheet - Page 596

Manufacturer Part Number

r5s77631ay266bgv

Renesas 32-bit Risc Microcomputer Superhtm Risc Engine Family Sh-4a Series

Manufacturer

Renesas Electronics Corporation.

Section 13 PCI Controller (PCIC)

Figure 13.2 shows the method for accessing the PCI bus allocated to the PCI memory space from

the SuperHyway bus.

To access to the PCI memory address space, use the PCI memory bank register (PCIMBR) and

PCI memory bank mask register (PCIMBMR). These registers should have an address space

ranging from 16 Mbytes to 512 Mbytes. PCI addresses can be allocated to by software.

The PCIC supports burst transfers to memory transfer.

Consecutive accesses with the SuperHyway load 32-byte or SuperHyway store 32-byte command

result in a burst transfer of 32-byte or more (64-byte, 96-byte, etc.).

The PCI memory spaces are allocated from H'FD00 0000 to H'FDFF FFFF for PCI memory space

0 (16 Mbytes), H'1000 0000 to H'13FF FFFF for PCI memory space 1 (Area 4, 64 Mbytes,

selection of the PCIC, DDRIF and LBSC spaces), and H'C000 0000 to H'DFFF FFFF for PCI

memory space 2 (512 Mbytes, available only in 32-bit address extended mode).

Address translation from SuperHyway bus to PCI local bus

The lower 15 bits ([17:3]) of a SuperHyway bus address are sent without translation.

Rev. 1.00 Oct. 01, 2007 Page 530 of 1956

REJ09B0256-0100

Accessing PCI Memory Space

Figure 13.2 SuperHyway Bus to PCI Local Bus Access

PCI memory space 1

PCI memory space 2

PCI memory space 0

address space (4GB)

PCI I/O 2 Mbytes

SuperHyway bus

address space (4GB)

PCI local bus