hx8k-breakout-extension

A PCB with SRAM, buttons, LEDs and some pmod-compatible connectors for the Lattice HX8K Breakout Board

Please notice: This PCB only carries SRAM with a data bus width of 8 bits. This is pretty narrow and can be performance-limiting. Also, let's be honest, this PCB layout is somewhat wacky. Perhaps you might consider building a more recent design with 16-bit SRAM instead.

BOM

Component	Description	Qty.
U1	4 MBit SRAM chip, 512Kx8, AS7C34096A, 10ns recommended, TSOP-II 44	1
RN1, RN2, RN3, RN4, RN5, RN6, RN7, RN8	33 Ohm resistor network, 4 resistors in one package, 1206 (4x0603) package	8
C1	100nF ceramic capacitor, 0805 package	1
D1, D2	SMD LEDs, red, 0805 package	2
R1, R2	resistors for the LEDs, 330 Ohm, 0805 package	2
SW1, SW2	6x6 mm push buttons, THT	2
R3, R3	optional pull-ups for SW1 and SW2, anything between 10K and 50K should be fine, 0805 package	2
J1, J2	2x20 male pin headers, 2.54 mm pin spacing	2
J3, J4	2x6 right-angled headers	2
J5	1x6 right-angled header	1