Datasheet

DS21352/DS21552
22 of 137
4.1.3 PARALLEL CONTROL PORT PINS (cont.)
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 non–multiplexed bus operation (MUX = 0), serves as the upper address bit. In multiplexed bus operation (MUX = 1), serves
to de-multiplex 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.