IDT72521 Datasheet | Integrated Device Technology

PARALLEL BIDIRECTIONAL FIFO 512 x 18 & 1024 x 18 Integrated Device Technology, Inc. IDT72511 IDT72521 Features : - Two side-by-side FIFO memory arrays for bidirectional data transfers - 512 x 18-Bit - 512 x 18-Bit (IDT72511) - 1024 x 18-Bit - 1024 x 18-Bit (IDT72521) - 18-bit data buses on Port A side and Port B side - Can be configured for 18-to-18-bit or 36-to-36-bit munication - Fast 35ns access time - Fully programmable standard microprocessor interface - Built-in bypass path for direct data transfer between two ports - Two fixed flags, Empty and Full, for both the A-to-B and the B-to-A FIFO - Two programmable flags, Almost-Empty and Almost-Full for each FIFO - Programmable flag offset can be set to any depth in the FIFO - Any of the eight flags can be assigned to four external flag pins - Flexible reread/rewrite capabilities - Six general-purpose programmable I/O pins - Standard DMA control pins for data exchange with peripherals - 68-pin PGA and PLCC packages DESCRIPTION: The IDT72511 and IDT72521 are highly integrated first-in, first-out memories that enhance processor-to-processor and processor-to-peripheral munications. IDT Bi FIFOs integrate two side-by-side memory arrays for data transfers in two directions. The Bi FIFOs have two ports, A and B, that both have standard microprocessor interfaces. All Bi FIFO operations are controlled from the 18-bit wide Port A. Port B is also 18 bits wide and can be connected to another processor or a peripheral controller. The Bi FIFOs have a 9-bit bypass path that allows the device connected to Port A to pass messages directly to the Port B device. Ten registers are accessible through Port A, a mand Register, a Status Register, and eight Configuration Registers. The IDT Bi FIFO has programmable flags. Each FIFO memory array has four internal flags, Empty, Almost-Empty, Almost-Full and Full, for a total of eight internal flags. The Almost-Empty and Almost-Full flag offsets can be set to any depth through the...