Sundance SMT329 - Manual (Page 43)

Each Ethernet controller has a dedicated DMA controller which can stream data to or from
the sram at full Ethernet speed of 1G bit/sec.
Programming details are in development and will be released as soon as they are finalised.
4.11 DMA controllers
There are a total of 8 DMA channels on the SMT329. These are divided into 2 groups of 4
called DMAA and DMAB. All DMA channels have the same register set and control features
including programmable interrupt generation. All perform 64 bit I/O to the sram.
Programming details are in development and will be released as soon as they are finalised.
4.12 Power Supplies
Connections are made to the following back plane power signals through VME connector P1:
+12V, -12V, +5V, and optionally the +3.3V supply on a VME64 back plane.
The +/-12V supplies are fed directly to the TIMs, they are not used anywhere else on the
board. The +5V supply is also fed to the TIMs, and used for most of the logic, and to feed a
DC-DC converter which can generate +3.3V for legacy VME systems with 96 way back plane
connectors. Optionally the SMT329 obtains the +3.3V supply from the VME64 160 pin 5 row
P1 connector using the row D pins.
The +3.3V DC-DC controller is a TPS5602IDBT from Texas Instruments, which also
generates +1.2V to supply the Virtex4 and Spartan3. The power distribution is through a
dedicated +3.3V power plane so the voltage drop here is minimal. The power plane
distributes +3.3V to all 4 TIM sites through the metal TIM fixing posts. It is designed to
supply 10 AMPS maximum.
When using the on board +3.3V DC-DC, it is essential to maintain adequate air flow, to
prevent over heating. Failure to cool the board properly at high current levels could result in
premature failure, and / or premature current limiting.
For this reason the preferred +3.3V supply option is directly from the VME64 back plane,
with the on board +3.3V supply disabled, as this reduces the cooling requirement. These
options are set during assembly as follows:
+3.3V
Source R42 F2 Description
Internal Not fitted Not fitted Enable DC-DC, disconnect back plane
VME64 0R MCR10A Disable DC-DC, connect back plane with 10A fuse.
User Manual SMT329 Page 43 of 52 Last Edited: 09/02/2007 10:58:00