User's guide
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3.15 VMEbus Interface
3.15.1 60x-to-VME Bridge
An in-house designed 60x-to-VME Bridge is used to interface the MPC8270 with the VMEbus. The
VMEbus interface of the bridge implements Master, Slave, Requester, Interrupter, Interrupt Handler,
Arbiter, and Bus Timer modules. This bridge contains a set of configuration registers for controlling VME
operations and board-specific features. A DMA controller is also included to perform SRAM-to-VME and
VME-to-SRAM transfers without CPU utilization. Please refer to
4 Bridge Registers
for detailed
information.
VMEb us Inte rf ace
Bridge
Configuration
Registers
VME
Slave
VME
Arbiter
VME
Bus Timer
VME
Interrupter
VME
Interrupt
Handler
VME
Requester
Bridge
Controller
PLL
60x
Bus Monitor
Board-
specific
Glue Logic
60x Bus
VMEbus
Local
Control Bus
16 MHz
32 MHz ext. clk
64 MHz
Ext. Drivers
Control Bus
DMA
Controller
VME
Master
Figure 10 - 60x-to-VME Bridge block diagram
VME Arbiter and Bus Timer can be enabled or disabled to allow the board to function as a system
controller board (slot 1) or as a peripheral board.
A configurable 60x Bus Monitor is also included in the bridge to replace the MPC8270 bus monitor and
overcome its limited timeout period. Please refer to the
BSCR
register description for more information.
A dedicated UPM must be used to access the 60x-to-VME bridge (bridge registers and VME master). The
UPM configuration must comply with the following description:
RAM Word #
RAM Word Value
0
0xccfc'ec00
1
0x00fc'fc40
2
0x00fc'fc40
3
0xf0fc'ec04
RSS
4
0xf3fd'ec01
24
0xccfc'ec00
25
0x00fc'fc40
26
0x00fc'fc40
27
0xf0fc'ec04
WSS
28
0xf3fd'ec01
EXS
60
0xffff'ec01
Table 13 - UPM initialization for bridge access
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Содержание VSBC-6872 Series
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