Datasheet

DS2408
22 of 39
Figure 12-1. ROM FUNCTIONS FLOW CHART
From Figure 12
2
nd
Part
To Control Functions
Flow Chart (Figure 8)
Master TX Bit 0
Master TX Bit 63
Master TX Bit 1
RC = 1
DS2408 TX
CRC Byte
DS2408 TX
Serial Number
(6 Bytes)
DS2408 TX
Family Code
(1 Byte)
Bit 0
Match?
Y
N
Bit 1
Match?
Y
N
Bit 63
Match?
Y
N
DS2408 TX Bit 0
DS2408 TX Bit 0
Master TX Bit 0
DS2408 TX Bit 1
DS2408 TX Bit 1
Master TX Bit 1
DS2408 TX Bit 63
DS2408 TX Bit 63
Master TX Bit 63
RC = 1
Bit 0
Match?
Y
N
Bit 1
Match?
Y
N
Bit 63
Match?
Y
N
To Figure 12
2
nd
Part
RC = 0
RC = 0
RC = 0
RC = 0
Y
Y
Y
Y
N
F0h
Search ROM
Command?
N
55h
Match ROM
Command?
N
ECh
Cond. Search
Command?
N
33h
Read ROM
Command?
To Figure 12
2
nd
Part
From Control Functions
Flow Chart (Figure 8)
Bus Master TX ROM
Function Command
DS2408 TX
Presence Pulse
OD
Reset Pulse?
N
Y
OD = 0
Bus Master TX
Reset Pulse
From Figure 12, 2
nd
Part
Condition Met?
Y
N
DS2408 TX Bit 0
DS2408 TX Bit 0
Master TX Bit 0
DS2408 TX Bit 1
DS2408 TX Bit 1
Master TX Bit 1
DS2408 TX Bit 63
DS2408 TX Bit 63
Master TX Bit 63
RC = 1
Bit 0
Match?
Y
N
Bit 1
Match?
Y
N
Bit 63
Match?
Y
N