PDP-11 ON RETRO-EP4CE15

Work in Progress

Build

FPGA Hardware

• Runs on RETRO-EP4CE15 FPGA card
  • Requires QM Tech Cyclone V FPGA Board
  • Or, EP4CE55 Cyclone IV Card

PDP2011 FPGA Builds

• Our PDP-11 FPGA Builds
  • PDP-11/45 build
  • PDP-11/70 build
• PDP2011 by Sytse van Slooten - the original project
• David Richards PDP-11 Build on A-ESTF V2 EP4CE22 Board
  • Wiki
  • A-ESTF Page

Software

• PDP-11 on BitSavers
• PiDP-11: Replica of the 1970s PDP-11/70

Disk Images

• RL images are in chunks of 256 bytes, and require inserting 256 bytes padding after each of those chunks
  • sdfmt converts files to 256 out of 512 bytes - Runs under Linux
• System Disk Images
• Disk Images
• OS Kits

Documentation

• PDP-11 Processor Handbook 1981 - on BitSavers
• PDP-11/45 System User's Manual
• PDP-11/70 Processor Handbook

Configuration Switches/Jumpers/LEDs

J3 - Configuration Jumpers (5CEFA2F23 FPGA Card pin numbers)

DRIVE	VALUE	SW3	SW2	SW1
rl	SELECT	OUT	OUT	IN
rk	SELECT	OUT	IN	OUT
rp	SELECT	IN	OUT	OUT
	J3	5, 6	3,4	1,2
	FPGA PIN	PIN_K22	PIN_K17	PIN_L17

Switches

• LEDS-SWITCHES

Function	J10 Pin	FPGA Pin
resetbtn	SW9	PIN_J16

Connectors

P1 - VGA (5CEFA2F23 Card)

• videoR0 = U8-49 = PIN_E12
• videoR1 = U8-50 = PIN_D12
• videoG0 = U8-51 = PIN_D13
• videoG1 = U8-52 = PIN_C13
• videoB0 = U8-53 = PIN_B13
• videoB1 = U8-54 = PIN_A13
• hSync = U8-55 = PIN_A15
• vSync = U8-56 = PIN_A14

P2 - PS/2 Keyboard

• PS2DAT = U7-8 = PIN_BANK_2A_AA1
• PS2CLK = U7-8 = PIN_NANK_2A_AA2

P3 - Serial Ports - I/O connector

• fpgaRx1 (in) = PIN_C11
  • Needs weak pullup
    • set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to rxd1
• fpgaTx1 (out) = PIN_G10
• fpgaRts1 = U7-44 = PIN_F10
• fpgaCts1 = U7-46 = PIN_B11

IO conn

• Second serial port on I/O connector
• rx2 (in) = PIN_M18
• tx2 (out) = PIN_L19
• rts2 (out) = PIN_N19
• cts2 (in) = PIN_M21

P4 - SD Card (5CEFA2F23 FPGA pin numbers)

• This build only works with SD Cards, not SD/HC or other newer cards.
• These cards are 1 GB or 2 GB in size.

• SDCS = U7-57 = PIN_BANK_7A_B15
• MOSI = U7-58 = PIN_BANK_7A_C15
• SCK = U7-59 = PIN_BANK_7A_C16
• MISO = U7-60 = PIN_BANK_7A_B16
• SD_DETECT - PIN_B12

J1 - I/O Connector (5CEFA2F23 FPGA Card pin numbers)

• J1-50 = GND
• J1-49 = GND
• J1-48 = PIN_M22 = resetbtn
• J1-47 = PIN_L22 = n/a
• J1-46 = PIN_L18 = tx1
• J1-45 = PIN_L19 = rx1
• J1-44 = PIN_M18 = rts1
• J1-43 = PIN_N19 = cts1
• J1-42 = PIN_M21 = n/a
• J1-41 = PIN_M20 = n/a
• J1-40 = PIN_N20 = xu_sclk
• J1-39 = PIN_N21 = xu_mosi
• J1-38 = PIN_P16 = xu_miso
• J1-37 = PIN_P17 = xu_debug_tx
• J1-36 = PIN_T20 = xu_cs
• J1-34 = PIN_P22 = greenled[1]
• J1-33 = PIN_R21 = greenled[0]
• J1-32 = PIN_R22 = greenled[3]
• J1-31 = PIN_T22 = greenled[2]
• J1-29 = PIN_U20 = greenled[4]
• J1-1 = VCC
• J1-2 = VCC

J4 - USB-B B (5CEFA2F23 FPGA Card pin numbers) Serial Port

• On-board FT230X FTDI USB to Serial

Resources

• PDP2011 by Sytse van Slooten
  • Active as of 2021-02
• David J Richards PDP-11 Build - copied and adapted from pdp2011 by Sytse van Slooten
  • Wiki
  • A-ESTF Page
• PDP-11 on BitSavers
  • Disk Images
• Scott L Baker PDP11-SOC
  • PDP-11/20 CPU
  • UART + Timer + I/O Ports coded in VHDL
  • 8KB RAM
  • Implemented on the Lattice iCE40-hx8k dev board
• w11: PDP 11/70 CPU and SoC
  • PDP-11/70 CPU with memory management unit, but without floating point unit,
  • Quick start Guide
  • OS Kits (Disk Images)
  • Guide to run operating system images on w11a systems
  • Guide to install and build w11a systems, test benches and support software

Programming the FPGA EEPROM (5CEFA2F23 FPGA)

• File
• Convert Programming File
• Configuration Device = MT25QL128
• Mode = Active Serial
• Programming File Type: *.jic
• Advanced = Check both Disables...
• Select Flash Loader
• Add Device = Cyclone V and 5CEFA2
• Select SOF Data
• Select Add File and select the .sof file
• Generate
• In Tools, Programmer
• Mode: JTAG
• Add file and select the .jic file
• Select Program/Configure
• Takes a while to program
• Press button near VGA

Pin List

# Analysis & Synthesis Assignments
# ================================
set_global_assignment -name FAMILY "Cyclone V"
set_global_assignment -name TOP_LEVEL_ENTITY top
set_global_assignment -name EDA_DESIGN_ENTRY_SYNTHESIS_TOOL "Design Compiler"

# Fitter Assignments
# ==================
set_global_assignment -name DEVICE 5CEFA2F23I7
set_global_assignment -name STRATIX_DEVICE_IO_STANDARD "3.3-V LVTTL"
set_global_assignment -name CRC_ERROR_OPEN_DRAIN OFF
set_global_assignment -name CYCLONEII_RESERVE_NCEO_AFTER_CONFIGURATION "USE AS REGULAR IO"
set_global_assignment -name FORCE_CONFIGURATION_VCCIO ON

# Pin & Location Assignments
# ==========================

# Clock and reset
set_location_assignment PIN_M9 -to clkin
set_location_assignment PIN_M22 -to resetbtn
set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to resetbtn
# Control switches - Jumpers on front edge
set_location_assignment PIN_L17 -to sw[0]
set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to sw[0]
set_location_assignment PIN_K17 -to sw[1]
set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to sw[1]
set_location_assignment PIN_K22 -to sw[2]
set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to sw[2]
set_location_assignment PIN_K21 -to sw[3]
set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to sw[3]
set_location_assignment PIN_M16 -to sw[4]
set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to sw[4]
set_location_assignment PIN_N16 -to sw[5]
set_instance_assignment -name WEAK_PULL_UP_RESISTOR ON -to sw[5]
# LEDs
set_location_assignment PIN_R21 -to greenled[0]
set_location_assignment PIN_P22 -to greenled[1]
set_location_assignment PIN_T22 -to greenled[2]
set_location_assignment PIN_R22 -to greenled[3]
set_location_assignment PIN_U20 -to greenled[4]
# SDRAM
set_location_assignment PIN_Y9 -to dram_addr[12]
set_location_assignment PIN_T9 -to dram_addr[11]
set_location_assignment PIN_R6 -to dram_addr[10]
set_location_assignment PIN_W8 -to dram_addr[9]
set_location_assignment PIN_T8 -to dram_addr[8]
set_location_assignment PIN_U8 -to dram_addr[7]
set_location_assignment PIN_V6 -to dram_addr[6]
set_location_assignment PIN_U7 -to dram_addr[5]
set_location_assignment PIN_U6 -to dram_addr[4]
set_location_assignment PIN_N6 -to dram_addr[3]
set_location_assignment PIN_N8 -to dram_addr[2]
set_location_assignment PIN_P7 -to dram_addr[1]
set_location_assignment PIN_P8 -to dram_addr[0]
set_location_assignment PIN_P9 -to dram_ba_1
set_location_assignment PIN_T7 -to dram_ba_0
set_location_assignment PIN_AA7 -to dram_cas_n
set_location_assignment PIN_V9 -to dram_cke
set_location_assignment PIN_AB11 -to dram_clk
set_location_assignment PIN_AB5 -to dram_cs_n
set_location_assignment PIN_P12 -to dram_dq[15]
set_location_assignment PIN_R12 -to dram_dq[14]
set_location_assignment PIN_U12 -to dram_dq[13]
set_location_assignment PIN_R11 -to dram_dq[12]
set_location_assignment PIN_R10 -to dram_dq[11]
set_location_assignment PIN_U11 -to dram_dq[10]
set_location_assignment PIN_T10 -to dram_dq[9]
set_location_assignment PIN_U10 -to dram_dq[8]
set_location_assignment PIN_AA8 -to dram_dq[7]
set_location_assignment PIN_AB8 -to dram_dq[6]
set_location_assignment PIN_AA9 -to dram_dq[5]
set_location_assignment PIN_Y10 -to dram_dq[4]
set_location_assignment PIN_AB10 -to dram_dq[3]
set_location_assignment PIN_AA10 -to dram_dq[2]
set_location_assignment PIN_Y11 -to dram_dq[1]
set_location_assignment PIN_AA12 -to dram_dq[0]
set_location_assignment PIN_V10 -to dram_udqm
set_location_assignment PIN_AB7 -to dram_ldqm
set_location_assignment PIN_AB6 -to dram_ras_n
set_location_assignment PIN_W9 -to dram_we_n
# Serial port (USB-to-Serial)
set_location_assignment PIN_L19 -to rx1
set_location_assignment PIN_L18 -to tx1
set_location_assignment PIN_M18 -to rts1
set_location_assignment PIN_N19 -to cts1
# Second serial port
# SD Card
set_location_assignment PIN_C16 -to sdcard_sclk
set_location_assignment PIN_B15 -to sdcard_cs
set_location_assignment PIN_B16 -to sdcard_miso
set_location_assignment PIN_C15 -to sdcard_mosi
# Seven segment display (on J1)
# Ethernet
set_location_assignment PIN_T20 -to xu_cs
set_location_assignment PIN_P17 -to xu_debug_tx
set_location_assignment PIN_P16 -to xu_miso
set_location_assignment PIN_N21 -to xu_mosi
set_location_assignment PIN_N20 -to xu_sclk
# PS/2 Keyboard
set_location_assignment PIN_AA2 -to ps2k_c
set_location_assignment PIN_AA1 -to ps2k_d
# Video
set_location_assignment PIN_E12 -to vgar[0]
set_location_assignment PIN_D12 -to vgar[1]
set_location_assignment PIN_B13 -to vgab[0]
set_location_assignment PIN_A13 -to vgab[1]
set_location_assignment PIN_D13 -to vgag[0]
set_location_assignment PIN_C13 -to vgag[1]
set_location_assignment PIN_A15 -to vgah
set_location_assignment PIN_A14 -to vgav