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參數(shù)資料
| 型號： | VIC64-UM |
| 英文描述： | VME/VMS/VXI/VSB Bus Interface/Controller |
| 中文描述： | VME總線/威邁斯/ VXI總線/獸醫(yī)管理局總線接口/控制器 |
| 文件頁數(shù)： | 10/13頁 |
| 文件大?。?/td> | 833K |
| 代理商： | VIC64-UM |
VIC64
Document #: 38-09002 Rev. **
Page 6 of 13
MOVEM Master Block Transfer
This
mode
of
block
transfer
provides
the
simplest
implementation of VMEbus block transfers. For this mode, the
local resource simply configures the VIC64 for a MOVEM block
transfer and proceeds with the consecutive-address cycles
(such as a 68K MOVEM instruction). The local resource
continues as the local bus master in this mode.
Master Block Transfers with Local DMA
In this mode, the VIC64 becomes the local bus master and
reads or writes the local data in a DMA-like fashion. This
provides a much faster interface than the MOVEM block
transfer, but with less control and fault tolerance.
D64 block transfers are not supported by MOVEM protocol.
VIC64 Slave Block Transfer
The VIC64 is capable of decoding the address modifier codes
to determine that a slave block transfer is desired. In this mode,
the VIC64 captures the VMEbus address, and latches it into
internal counters. For subsequent cycles, the VIC64 simply
increments this counter for each transfer. The local protocol for
slave block transfers can be configured in a full handshake
mode by toggling both PAS* and DS* and expecting DSACKi*
to toggle, or in an accelerated mode in which only DS* toggles
and PAS* is asserted throughout the cycle.
For D64 slave block transfers, the SCON*/D64 signal is
asserted to indicate a D64 transfer is in progress. External
logic is required to de-multiplex the data from the VMEbus
address bus for the upper 24 address/data lines. The lower 8
bits are done within the VIC64.
Module-Based DMA Transfers
The VIC64 can act as a DMA controller between two local
resources. This mode is similar to that of master block trans-
fers with local DMA, with the exception that the VMEbus is not
the source or destination.
VIC64 Interrupt Generation and Handling Facilities
The VIC64 can generate and handle a seven-level prioritized
interrupt scheme similar to that used by the Motorola 68K
processors. These interrupts include:
7 VMEbus interrupts
7 local interrupts
5 VIC64 error/status interrupts
8 interprocessor communication interrupts.
The VIC64 can be configured to act as handler for any of the
seven VMEbus interrupts. The VIC64 can generate the seven
VMEbus interrupts as well as supplying a user-defined
status/ID vector. The local priority level (IPL) for VMEbus
interrupts is programmable. When configured as the system
controller, the VIC64 drives the IACK* daisy chain.
The local interrupts can be configured with the following:
User-defined local interrupt priority level (IPL)
Option for VIC64 to provide the status/ID vector
Edge or level sensitivity
Polarity (rising/falling edge, active HIGH/LOW)
The VIC64 is also capable of generating local interrupts on
certain error or status conditions. These include:
ACFAIL* asserted
SYSFAIL* asserted
Failed master write-post (BERR* asserted)
Local DMA completion for block transfers
Arbitration timeout
VMEbus interrupter interrupt
The VIC64 can also interrupt on the setting of a module or
global switch in the interprocessor communication facilities.
Interprocessor Communication Facilities
The VIC64 includes interprocessor registers and switches that
can be written and read through VMEbus accesses. These are
the only such registers that are directly accessible from the
VMEbus. Included in the interprocessor communication
facilities are:
Four general-purpose 8-bit registers
Four module switches
Four global switches
VIC64 version/revision register (read-only)
VIC64 reset/halt condition (read-only)
VIC64 interprocessor communication register semaphores
When set through a VMEbus access, these switches can
interrupt a local resource. The VIC64 includes module
switches that are intended for a single module, and global
switches which are intended to be used as a broadcast.
Related Documents
VMEbus Interface Handbook
Operating Range
Range
Ambient
Temperature
VCC
Commercial
0
°C to +70°C
5V
± 5%
Industrial
–40
°C to +85°C
5V
± 10%
Military
–55
°C to +125°C
5V
± 10%
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