Sundance SMT148FX - Manual (Page 15)

4.1.10 RS485
Each of the 16 RS485 signal pairs is driven by an SN75HVD12. They are arranged
into two groups of 8-bits each and have a single control signal which selects the
group to be a transmitter or receiver.
Connector RS1 carries these signals.
Function pin pin Function Function pin pin Function
S0- 1 2 S0+ GND 21 22 GND
S1- 3 4 S1+ GND 23 24 GND
S2- 5 6 S2+ S8- 25 26 S8+
S3- 7 8 S3+ S9- 27 28 S9+
S4- 9 10 S4+ S10- 29 30 S10+
S5- 11 12 S5+ S11- 31 32 S11+
S6- 13 14 S6+ S12- 33 34 S12+
S7- 15 16 S7+ S13- 35 36 S13+
GND 17 18 GND S14- 37 38 S14+
GND 19 20 GND S15- 39 40 S15+
4.1.11 SHB
A single SHB connector (Samtec QSH-030-01) provides two independent 16-bit
SDBs, or a single 32-bit SDB interface. These signals are connected directly to the
FX60.
4.1.12 LEDs
32 LEDs are connected to the Virtex 4 FPGA in a matrix of 8x4.
4.1.13 ZBT Memory
Two 16-bit wide ZBT memories are connected directly to the FPGA. This provides a
memory bank of 2Mx16 bits (4Mbytes).
The standard FPGA firmware does not include functions to control the
ZBTRAM. VHDL test code is available. Please contact Sundance for
further information.
User Manual SMT148FX Page 15 of 48 Last Edited: 03/08/2009 11:42:00