memory products - Al Kossow's Bitsavers

MK4501 (N, K)-65/80/10/12/15/20[)EPTH EXPANSION (DAISY CHAIN)rhe MK4501 can easily be adapted to applicationsNhen the· requirements are for greater than 512NOrdS. Figure 9 demonstrates Depth Expansion us­Ing three MK4501s. Any depth can be attained byadding additional MK4501s.The MK4501 operates in the Depth Expansion configurationafter the chip is Reset under the belowlisted conditions.1. The first device must be designated by groundingthe First Load pin (FL). The Retransmit function isnot allowed in the Depth Expansion Mode.External logic is needed to generate a compositeFull F!!g and Empty Flag. This requires the ORingof all EFs and the ORing of all FFs (i.e,J1I mustoe set to generate the correct composite FF or EF).FIGURE 9. A 1536 x 9 FIFO CONFIGURATION (DEPTH EXPANSION)2. All other devices must have FL in the high state.3. The Expansion Out (XO) pin o~ach device mustbe tied to the Expansion In (XI) pin of the nextdevice.DATA IN -------1----.-.,..-,r-r--.,--,---f-----,) DATA OUTH--1_+-+-------vcc9/15405----------.--------~-------.----- ---~