GE Fanuc Automation VMIVME-7750 Specifications

Mailboxes: The VMEbus interface provides four 32-bit

mailboxes, which are accessible from both the microprocessor

and the VMEbus providing interprocessor communication. The

mailboxes have the ability to interrupt the microprocessor when

accessed by VMEbus.

Interrupt Handler: The interrupt handler monitors, and can be

programmed to respond to any or all VMEbus IRQ* lines. All

normal-process VMEbus-related interrupts can be mapped to

PCI INTA# or SERR# interrupts. These include:

Mailbox interrupts

VMEbus interrupts

VMEbus interrupter IACK cycle (acknowledgment of

VMIVME-7750 VMEbus-issued interrupts)

All error processing VMEbus-related interrupts can be mapped

to PCI INTA# or SERR#. Note: PCI SERR# initiates a SBC NMI.

These include:

ACFAIL* interrupt

BERR* interrupt

SYSFAIL* interrupt

The interrupt handler has a corresponding STATUS/ID register

for each IRQ* interrupt. Once the handler receives an IRQ*, it

requests the VMEbus and, once granted, it performs an IACK

cycle for that level. Once the IACK cycle is complete and the

STATUS/ID is stored in the corresponding ID register, an

appropriate interrupt status bit is set in an internal status

register, and a PCI interrupt is generated. The PCI interrupt can

be mapped to PCI INTA# or SERR#.

Interrupter: Interrupts can be issued under software control on

any or all of the seven VMEbus interrupt lines (IRQ7* to IRQ1*). A

common ID register is associated with all interrupt lines. During

the interrupt acknowledge cycle, the interrupter issues the ID to

the interrupt handler.

The interrupter can be programmed to generate a PCI INTA# or

SERR# interrupt when a VMEbus interrupt handler

acknowledges a software-generated VMEbus interrupt.

Byte Swapping: The Intel 80x86 family of processors use little

endian format. To accommodate other VMEbus modules that

transfer data in big-endian format such as the 680x0 processor

family, the VMIVME-7750 incorporates byte-swapping

hardware. This provides independent byte swapping for both

the master and slave interfaces. Both master and slave

interface byte swapping are under software control.

The VMIVME-7750 supports high throughput DMA transfers of

bytes, words, and longwords in both master and slave

configurations.

If endian conversion is not needed, we offer a special “bypass”

mode that can be used to further enhance throughput. (Not

available for byte transfers.)

Master Interface: MA32:MBLT32:MBLT64

(A32:A24:A16:D32:D16:D8 (EO):BLT32)

The VMEbus master interface provides nine separate memory

windows into VMEbus resources. Each window has separate

configuration registers for mapping PCI transfers to the VMEbus

(that is, PCI base address, window size, VMEbus base address,

VMEbus access type, VMEbus address/data size, etc.). The

maximum/minimum window sizes for the nine windows are as

follows:

Window

Minimum Size

0. 4

Maximum Size

4 Kbyte

1 to 3. 5 to 7

4 Gbyte

64 Kbyte

Special Cycle

4 Gbyte

64 Mbyte

64 Mbyte

Slave Interface: Memory Access

SAD032:SD32:SBLT32:SBLT64

(A32:A24:A16:D32:D16:D8 (EO): BLT32)

The VMEbus slave interface provides eight separate memory

windows into PCI resources. Each window has separate

configuration registers for mapping VMEbus transfers to the PCI

bus (that is, VMEbus base address, window size, PCI base

address, VMEbus access type, VMEbus address/data size, etc.).

The maximum/minimum window sizes for the eight windows

are as follows:

Window

Minimum Size

0. 4

Maximum Size

4 Kbyte

4 Gbyte

1 to 3. 5 to 7

64 Kbyte

4 Gbyte

In addition, each window can be programmed to operate in

coupled or decoupled mode. In decoupled mode, the window

utilizes a write-posting FIFO and/or a read prefetching FIFO for

increased system performance. In coupled mode, the FIFOs are

bypassed and VMEbus transactions are directly coupled to the

PCI bus (that is, transfers on VMEbus are not completed until

they are completed on the PCI bus).

Enhanced Bus Error Handling: Enhancements over the

Universe chip’s bus error handling features are provided. A latch

and register are provided to allow the SBC to read the VMEbus

address that caused the bus error in all modes. The Universe

chip’s support is limited to decoupled mode.

Support for bus cycle timeout and assertion of bus error is

provided. The board may be configured to assert bus error upon

timeout regardless of its status as system controller. The

Universe chip asserts bus error only if it is system controller. In

addition, this board may be configured to assert an interrupt

upon bus cycle timeout.

Operating System and Software Support

The VMIVME-7750 provides embedded features beyond PC/AT

functionality. These features are supported by GE Fanuc

Embedded Systems software products aimed at developers

who are incorporating GE Fanuc Embedded Systems SBCs, I/O

boards, and workstations into systems. Windows XP/Windows

2000 and VxWorks are the most common operating systems

supported by GE Fanuc Embedded Systems software products.

Windows XP/Windows 2000: The IOWorks® software family is a

set of software components that can work together or

separately to provide a total development environment for any

application in a Windows XP/ Windows 2000 OS.

VMISFT-9422 VMEbus Access™ for Windows XP/Windows

2000: The VMEbus Access product is specifically designed for