Datasheet

DS1992/DS1993
12 of 17
Figure 9. ROM FUNCTIONS FLOW CHART
F0H
Search ROM
Command
?
CCH
Skip ROM
Command
?
DS199x TX Bit 0
DS199x TX Bit 0
Master TX Bit 0
Bit 0
Match ?
DS199x TX Bit 1
DS199x TX Bit 1
Master
TX Bit 1
Bit 1
Match ?
DS199x TX Bit 63
DS199x TX Bit 63
Master TX Bit 63
Bit 63
Match ?
Master TX Memory
Function Command
33H
Read ROM
Command
?
DS199x TX
Serial Number
6 Bytes
DS199x TX
CRC Byte
DS199x TX
Family Code
1 Byte
Match ROM
55H
Command
?
Bit 0
Match ?
Bit 1
Match ?
Bit 63
Match ?
Master TX Bit 1
Master TX Bit 0
N
Y
N
Y
N
N
Y
N
N
N
N
Y
Y
Y
Y
Y
Y
N
Y
N
Master TX ROM
Function Command
Master TX
Reset Pulse
DS199x TX
Presence Pulse
Master TX Bit 63