Sundance SMT387 - Manual (Page 17)

Version 1.0.3 Page 17 of 42 SMT387 User Manual
communication from the PC. The Parallel Cable III supports only parallel port
communication from the PC to the Boundary Scan chain.
Memory
Pipelined ZBTRAM
Up to 4MB of pipeline ZBT memory is provided with direct access by the FPGA.
The ZBTRAM is designed to sustain 100% bus bandwidth by eliminating the
turnaround cycle when there is transition from Read to Write, or vice versa.
This device is well suited for SDR applications that experience frequent bus
turnarounds, need to operate on small data chunks (especially one-word chunks),
and need to operate at higher frequencies than permitted by the flow-through
version.
For more complete information, please read:
General Information on how to choose your memory type according to your
application
For the parts datasheet, please read:
ZBTRAM datasheets
Chips parts and densities are shown in the table below.
ZBTRAM part
number Size in
bits
Size in
Bytes
Actual
Memory
size Amount of
memory
per board
K7N801801M 8Mb 1MB 512kx18 1MB
K7N161801A 16Mb 2MB 1Mx18 2MB
K7N321801M 32Mb 4MB 2Mx18 4MB
Table 2: ZBTRAM sizes
The total available ZBT RAM on the board is therefore 1 MB, 2 MB, or 4 MB.
Comports
The SMT387 provides 6 Comports, numbered 0, 1, 2, 3, 4, and 5.
These are described in
http://sundance.com/docs/Firmware.pdf
The Comport drives at 3.3v signal levels.