EF9345 Datasheet | STMicroelectronics

DESCRIPTION The EF9345, new advanced color CRT controller, in conjunction with an additional standard memory package allow full implementation of the plete display control unit of a color or monochrome lowcost termainl, thus significantly reducing IC cost and PCB space. March 1995 R/W AD0 AD1 AD2 V CC AD4 AD3 1/38 PIN DESCRIPTION (All the input/output pins are TTL patible) Name Pin Type Pin N° Function Description MICROPROCESSOR INTERFACE AD(0:7) I/O 17-29 21-25 14 Multiplexed Address/Data Bus Address Strobe These 8 bidirectional pins provide munication with the microprocessor system bus. The falling edge of this control signal latches the address on the AD(0:7) lines, the state of the Data Strobe (DS) and Chip Select (CS) into the chip. When this input is strobed high by AS, the output buffers are selected while DS is low for a read cycle (R/W = 1). In write cycle, data present on AD(0:7) lines are strobed by R/W low (see timing diagram 2). When this input is strobed low by AS, R/W gives the direction of data transfer on AD(0:7) bus. DS high strobes the data to be written during a write cycle (R/W = 0) or enables the output buffers during a read cycle (R/W = 1). (see timing diagram 1). This input determines whether the Internal registers get written or read. A write is active low (”O”). The EF9345 is selected when this input is strobed low by AS. Data Strobe R/W CS 16 26 Read/Write Chip Select MEMORY INTERFACE ADM(0:7) AM(8:13) OE WE ASM OTHER...