DS2156
Signal Name:
CS
Signal Description:
Chip Select
Signal Type:
Input
Must be low to read or write to the device. CS is an active-low signal.
Signal Name:
ALE(AS)/A7
Signal Description:
Address Latch Enable (Address Strobe) or A7
Signal Type:
Input
In nonmultiplexed bus operation (MUX = 0), serves as the upper address bit. In multiplexed bus operation
(MUX = 1), serves to demultiplex the bus on a positive-going edge.
Signal Name:
WR (R/W)
Signal Description:
Write Input(Read/Write)
Signal Type:
Input
WR is an active-low signal.
Signal Name:
TUSEL
Signal Description:
TDM/UTOPIA Backplane Select
Signal Type:
Input
Low to enable TDM backplane. High to enable UTOPIA backplane.
3.4 Extended System Information Bus
Signal Name:
ESIBS0
Signal Description:
Extended System Information Bus Select 0
Signal Type:
Input/Output
Used to group two to eight DS2156s into a bus-sharing mode for alarm and status reporting. See Section 29 for
more details.
Signal Name:
ESIBS1
Signal Description:
Extended System Information Bus Select 1
Signal Type:
Input/Output
Used to group two to eight DS2156s into a bus-sharing mode for alarm and status reporting. See Section 29 for
more details.
Signal Name:
ESIBRD
Signal Description:
Extended System Information Bus Read
Signal Type:
Input/Output
Used to group two to eight DS2156s into a bus-sharing mode for alarm and status reporting. See Section 29 for
more details.
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