DS21354/DS21554 3.3V/5V E1 Single-Chip Transceivers
Signal Name:
RD (DS)
Signal Description:
Signal Type:
Read Input—Data Strobe
Input
In Intel Mode, RD determines when data is read from the device. In Motorola Mode, DS is used to write
to the device. See the Bus Timing Diagrams section.
Signal Name:
CS
Signal Description:
Signal Type:
Chip Select
Input
Must be low to read or write to the device. CS is an active-low signal.
Signal Name:
ALE (AS)/A7
Signal Description:
Signal Type:
Address Latch Enable (Address Strobe) or A7
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:
Signal Type:
Write Input (Read/Write)
Input
WR is an active-low signal.
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