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System Controller: PCI Interface
10006024-04 Katana
®
752i User’s Manual
5-5
PCI Identification
The Katana
®
752i has been assigned the following PCI identification numbers.
Table 5-1: PCI Identification Values
PCI Read/Write
The MV64460 becomes a PCI bus master when the CPU, IDMA, or MPSC SDMAs initiate a
bus cycle to a PCI device. Conventional PCI mode allows unlimited DMA bursts between PCI
and memory. It supports all PCI commands including 64-bit addressing using dual access
cycles (DAC).
The MV64460 acts as a target when a PCI device initiates a memory access (or an I/O access
in the case of internal registers, or a P2P transaction). It responds to all memory read and
write accesses, including DAC, and to all configuration and I/O cycles in the case of internal
registers. Its internal buffers allow unlimited burst reads and writes, and they support up to
four pending delayed reads in conventional PCI mode.
PCI Interface Registers
PCI0 and PCI1 contain the same set of internal registers, but are located at different offsets.
A CPU access to the MV64460 PCIx Configuration register is performed via the PCIx Config-
uration Address and Data registers.
All PCI configuration registers are located at their standard offset in the configuration
header, as defined in the PCI specification, when accessed from their corresponding PCI
bus. For example, if a master on PCI1 performs a PCI configuration cycle on PCI’s Status and
Command register, the register is located at 0x004.
A host access from the PCI interface to this register allows the target PCI device to acknowl-
edge the interrupt by turning off the INTA* interrupt. Although the interrupts are active
low, the register values are active high. For example, a value of one in the INTA field indi-
cates that an interrupt is pending on INTA*. Also, writing a one to this location asserts the
INTA* interrupt.
The Katana
®
752i may generate interrupts to other PCI devices by accessing doorbell-type
interrupt-generating registers or address ranges within their PCI bridges. The board will
respond to interrupts caused by another PCI device when it accesses a programmable
range of local memory, as provided by the MV64460 memory controller. In addition, it may
Field: Value: Description:
Vendor ID 0x11AB Marvell
Device ID 0x6480 MV64460 System Controller
Subsystem Vendor ID 0x1223 Emerson Network Power
Subsystem Device ID 0x0048 Katana
®
752i