Block Diagram
http://www.motorola.com/computer/literature 3-19
3
Note The information in Table 3-12 is appropriate when configured
with devices with an access time equal to 3 CLK periods.
Ethernet Interface
The MVME240x module uses Intel’s DECchip 21143 PCI Fast Ethernet
LAN controller to implement an Ethernet interface that supports
10BaseT/100BaseTX connections, via an RJ-45 connector on the front
panel. The balanced differential transceiver lines are coupled via on-board
transformers.
Every MVME240x is assigned an Ethernet station address. The address is
$08003E2xxxxx, where xxxxx is the unique 5-nibble number assigned to
the board (that is, every board has a different value for xxxxx).
Each MVME240x displays its Ethernet station address on a label attached
to the base board in the PMC connector keepout area just behind the front
panel. In addition, the six bytes including the Ethernet station address are
stored in the NVRAM (BBRAM) configuration area specified by boot
ROM. That is, the value 08003E2xxxxx is stored in NVRAM. The
MVME240x debugger, PPCBug, has the capability to retrieve the Ethernet
station address via the CNFG command.
Table 3-12. PPC Bus to ROM/Flash Access Timing (30ns @ 100 MHz)
ACCESS TYPE
CLOCK PERIODS REQUIRED FOR:
Total
Clocks
1st Beat 2nd Beat 3rd Beat 4th Beat
16
Bits
64
Bits
16
Bits
64
Bits
16
Bits
64
Bits
16
Bits
64
Bits
16
Bits
64
Bits
4-Beat Read 34 13 28 7 28 7 28 7 118 34
4-Beat Write N/A N/A
1-Beat Read (1 byte) 1313------1313
1-Beat Read (2 to 8 bytes)3413------3413
1-Beat Write 2121------2121
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