1. Temperature Measurement
ECE 448: Lab 6
Using PicoBlaze
Temperature Measurement
Serial Communication

2. Sources P. Chu, FPGA Prototyping by VHDL Examples
Chapter 14, Picoblaze Overview
Chapter 15, Picoblaze Assembly Code
Development
Chapter 16, Picoblaze I/O Interface
Chapter 17, Picoblaze Interrupt Interface
ECE 448 – FPGA and ASIC Design with VHDL

3. A[7..0] DO[7..0] DI[7..0] to DS1620 RST DQ CLK INSTRUCTION ROM Buttons
SSD3
SSD2
INPUT
TEMP_STATUS
TEMP_CTRL
OUTPUT_INTERFACE
INPUT_INTERFACE
TEMP
ADDR_DECODER
DATA
RAM
PICOBLAZE
INSTRUCTION
ROM
DO[7..0]
DI[7..0]
out_port
A[7..0]
port_id
instruction
address
addr
TA[7..0]
din
read_strobe
write_strobe
dout
SSD3_en, SSD2_en,
SSD1_en, SSD0_en
TEMP_CTRL_en,
RAM_wen,
RAM_ren we re
RAM_wen
in_port
interrupt
interrupt_ack
Four 7-segment
displays
TD[7..0]
T_wen
T_init
SSD1
SSD0
register
Buttons
RST DQ
CLK
to DS1620

4. 00 01 02
. . . 3F 40 41 42 43 44 45 46 FD FE FF
64 x 8
DATA
RAM
INPUT
SSD3
SSD2
TEMP_STATUS
TEMP_CTRL
INPUT: A
A – button active (bit cleared by reading register
INPUT or by interrupt_ack),
b3-b0 – status of buttons 3 to 0 respectively;
1 means that the button was pressed. b0 b1 b2 b3
TEMP_STATUS: D
D – done: bit cleared by writing
to register TEMP_CTRL, set after TEMP
generates 64 8-bit numbers. MNO – current
measurement number, changing from 0 to 63.
TEMP_CTRL: M
M – measure: after 1 is written to this bit,
TEMP performs 64 temperature measurements,
and stores the results in DATA RAM.
SSD1
SSD0
MAX
MIN
AVR
MNO

5. Task 1 – Browsing Mode 64x8 RAM Two 7-Segment Displays (in hexadecimal
notation) (SSD3-SSD2)
Address
Data 00 01 02 03 04
05 …. 3B 3C 3D 3E 3F 00 01 02 03 04
05 …. 3B 3C 3D 3E 3F
Current Address
Value at
Current Address
Button 1 =
Increment Address
Button 0 =
Decrement Address
Two 7-Segment
Displays
(in hexadecimal
notation) (SSD1-SSD0)
64x8 RAM

6. Task 2 – Editing Mode 64x8 RAM Two 7-Segment Displays (SSD3-SSD2)
(in hexadecimal
notation)
Address
Data 00 01 02 03 04
05 …. 3B 3C 3D 3E 3F 00 01 02 03 04
05=>06 …. 3B 3C 3D 3E 3F
Value at
Current Address
Two 7-Segment
Displays (SSD1-SSD0)
(in hexadecimal
notation)
Current Address
Button 1 =
Increment Address
Button 0 =
Decrement Address
Button 2= Edit
Button 1 =
Increment Data
Button 0 =
Decrement Data
Button 2= Approve
64x8 RAM

7. Task 3 – Temperature Measurement Mode
Address
Data 00 01 02 03 04
05 …. 3B 3C 3D 3E 3F 4D 4E 4F 50
52 …. 5F 60 62 63 64
Button 3 =
Start
64 Temperature
Measurements
64x8 RAM

8. Task 4 – Calculation Mode
Address
Data 00 01 02 03 04
05 …. 3B 3C 3D 3E 3F FD FE FF 4D 4E 4F 50
52 …. 5F 60 62 63 64 56
Button 3=
calculating maximum, minimum, and average
Maximum, minimum, and average
are stored in memory locations
at positions FD, FE, and FF
respectively, and displayed using
SSD3-SSD1 in hexadecimal notation. …
MAX =>
MIN =>
AVR =>
64x8 RAM

9. Introduction to Picoblaze Development Environment (Hands-on Session)