r5s77631ay266bgv Renesas Electronics Corporation., r5s77631ay266bgv Datasheet - Page 612

• Manufacturer Part Number: r5s77631ay266bgv
• Description: Renesas 32-bit Risc Microcomputer Superhtm Risc Engine Family Sh-4a Series
• Manufacturer: Renesas Electronics Corporation.

Section 13 PCI Controller (PCIC)
13.4.5
(1)
The PCIC supports a subset of the PCI Local Bus Specification Revision 2.2 and can be connected
to a device with a PCI bus interface.
While the PCIC is set in host bus bridge mode, or while set in normal mode, operation differs
according to whether or not bus parking is performed, and whether or not the PCI bus arbiter
function is enabled or not.
In host bus bridge mode, the AD, CBE, PAR signal lines are driven by the PCIC when transfers
are not being performed on the PCI bus. When the PCIC subsequently starts transfers as master,
these signal lines continue to be driven until the end of the address phase.
The arbiter in the PCIC and the REQ and GNT between PCIC are connected internally. Here, pins
REQ0/REQOUT, REQ1, REQ2, and REQ3 function as the REQ inputs from the external masters
0 to 3. Similarly, GNT0/GNTIN, GNT1, GNT2, and GNT3 function as the GNT outputs to
external masters 0 to 3. Including the PCIC, arbitration of up to five masters is possible.
(2)
The PCIC supports configuration mechanism #1. The PCI PIO address register (PCIPAR) and PCI
PIO data register (PCIPDR) correspond to the configuration address register and configuration
data register, respectively.
When PCIPDR is read from or written to after PCIPAR has been set, a configuration cycle is
issued on a PCI bus.
For a type 0 transfer, bits 10 to 2 of the configuration address register are sent without translation
and bits 31 to 11 are translated so that these bits can be used as the IDSEL signal.
Bit 16 of the AD signal is driven to 1 and the other bits are made 0 by setting the device number to
0.
Bit 17 of the AD signal is driven to 1 and the other bits are made 0 by setting the device number to
1. Similarly, setting the device number to 2 drives bit 18 of the AD signal to 1 and setting the
device number to 3 drives bit 19 of the AD signal to 0.
Bit 31 of the AD signal is driven to 1 and the other bits are made 0 by setting the device number to
16.
For details, refer to "PCI Local Bus Specification Revision 2.2, section 3.2.2.3 Configuration
Space Decoding".
Rev. 1.00 Oct. 01, 2007 Page 546 of 1956
REJ09B0256-0100
PCI Host bus bridge Mode Operation
Configuration Space Access
Host Bus Bridge Mode