User guide

FT 3120 / FT 3150 Smart Transceiver Data Book 23
Additional Functions
• Off-chip RAM initialization
• Random number seed calculation
• System RAM setup
• Communication port initialization
• Checksum initialization
Figure 2.11 RESET Timeline for FT 3120 and FT 3150 Smart Transceivers
Scheduler Init
One-Second Timer Init
Checksum Init
Comm Port Init
System RAM Setup
Random Number Seed Calc
Off-Chip RAM
State Init
SERVICE
Pin Init
Stack Init and BIST
Specified by Application
Oscillates at Divide by 2 of CLK1 Stable Address Reflecting Firmware Execution Stable Data Reflecting Firmware Execution
Stable R/W Reflecting Firmware Execution
RESET
IO [10:8, 3:0]
SERVICE
E
ADDR [15:0]
DATA [7:0]
R/W
WARNING: NOT TO SCALE
Reset
High or Low
Low
Enabled
IO [7:4]
Output
Pull-Ups
Specified by Application
FT 3150 ONLY
Oscillates
*NOTE: On power up, the oscillator will start running before RESET is released.
Oscillator Stabilization*
Oscillator Start-Up*