r8a77850anbg Renesas Electronics Corporation., r8a77850anbg Datasheet - Page 581
r8a77850anbg
Manufacturer Part Number
r8a77850anbg
Description
Renesas 32-bit Risc Microcomputer Superh? Risc Engine Family
Manufacturer
Renesas Electronics Corporation.
Datasheet
1.R8A77850ANBG.pdf
(1692 pages)
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The PCI controller (PCIC) controls the PCI bus and enables data transfers between memory
connected to an external bus and a PCI device connected to the PCI bus. The PCIC facilitates the
system design using the PCI bus and enables short and fast data transfer.
The PCIC operates as a bus bridge which links the PCI bus to the internal bus (SuperHyway bus).
It has transfer channels, for example, between a PCI device on the PCI bus and memory that is
connected to the external bus.
The PCIC supports both the host mode and normal mode (non-host mode). In host mode,
arbitration can be performed on the PCI bus. In normal mode, the PCI bus arbitration is performed
by the external PCI bus arbiter.
13.1
The PCIC has the following features.
• Conforms to the subset of the PCI Local Bus Specification Revision 2.2
• Operates at 33 or 66 MHz
• 32-bit data bus
• PCI master and target functions
• Conforms to the subset of the PCI Power Management Revision 1.1
• Supports the host mode and normal mode
• PCI arbiter (in host mode)
• Supports four external masters
• Pseudo-round-robin or fixed priority arbitration
• Supports external bus arbiter mode
• Supports configuration mechanism #1 (in host mode)
• Supports burst transfer
• Parity check and error report
• Exclusive access (only when PCIC is a target)
Exclusive access between the internal module and the external PCI master is not supported.
⎯ The PCIC is a master: Not supported
⎯ The PCIC is a target: When the PCIC is locked, it can be accessed through only the PCI
device that has asserted the LOCK signal (the SuperHyway bus is not locked during lock
transfer).
Features
Section 13 PCI Controller (PCIC)
Rev.1.00 Jan. 10, 2008 Page 551 of 1658
13. PCI Controller (PCIC)
REJ09B0261-0100
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